TO PING OR NOT TO PING?
09-24-2007, 05:12 PM
#61
Guest
Posts: n/a
Re: TO PING OR NOT TO PING?
One some vehicles, you can hear a faint ticking sound from the
injectors, but I've never been able to hear them at highway speeds. It
is usually with the hood opened and your head in the engine compartment.
Chris
FrankW wrote:
> On My 05TJ Rubicon
> Sometimes not always I can hear a slight ticking sound
> Kinda like the lifters.
>
> One day when it was really cold outside (-28C)
> I started it without the block heater plugged in
> It made a very loud ticking noise but only for a few seconds
> Someone somewhere said that it wasn't the lifters but something else.
> I forget what he said it was. Something not to worry about though.
> (I think)
> It might have been in the "Rubicon owners forum"
>
> http://www.rubiconownersforum.com/phpbb2/index.php
>
> Try searching there for it if ya want.
>
>
> c wrote:
>> Tracie wrote:
>>
>>> On Sep 24, 12:25 pm, Tracie <brain...@upstate.edu> wrote:
>>>
>>>> Quick question...
>>>>
>>>> 2006 TJ
>>>> 6 speed manual
>>>> 4.0 liter with I-6
>>>> 31/10.50/15 BFGs
>>>>
>>>> When moving along at highway speeds or at lower speeds, does anyone
>>>> else's Wrangler engine sound like a 'rattlesnake' is in there? I am
>>>> not sure if this is pinging or simply just the normal sound of the
>>>> motor. Keep in mind that I do not use my 6th gear on the highway due
>>>> to the 31s. I am travelling along at approximately 65 mph and running
>>>> about 2400-2500 rpms when this sound occurs. If I back off the
>>>> accelerator and get to about 62-63 mph, the sound stops. It's not a
>>>> metallic type sound. Just a 'rattling' or 'purring' type sound. Any
>>>> insight?
>>>
>>>
>>> Sorry but I forgot to add the following....
>>>
>>> Since I have upgraded from 28s to 31s, can that cause the engine to
>>> lug or ping? I generally keep the RPM's around 2200-2400 in 5th gear
>>> (I have a 6 speed). In the higher gears after the engine is warm and
>>> mainly while going uphill (little or big), I get this noise on the
>>> passenger side that sounds VERY similar to the soft top side window
>>> 'pinging' against the metal support bow when the wind blows. I can't
>>> quite distinguish if that's it, or if the engine is pinging because I
>>> am not 100% sure whether it's coming from the front or the back.
>>> It's
>>> a high-pitched noise. It is NOT rhythmic or steady, but rather comes
>>> and goes intermittently. This noise does NOT happen at city/town
>>> speeds of 50 mph or lower. I ran a tank of 89 through her, and it
>>> seemed to be drastically reduced after 1/4 of the tank was used and
>>> for the rest of the 3/4 of the tank. I have now refilled again with
>>> the 89 and the noise is back. I have not used 1/4 of the tank yet,
>>> so
>>> I don't know if it will be reduced again once I get to that point. I
>>> do have a tendecy to 'stuff' as much gas in the tank as I can get
>>> (even after the automatic shuf-off on the spout kicks on). Would
>>> this
>>> be causing the problem too?
>>>
>>
>> Did you get your gas at the same place both times? They shouldn't have
>> done it quite yet, but if a station got a tank of winter blend gas,
>> this could be causing your problem, if it is indeed pinging. By
>> running in 5th gear, you shouldn't be experiencing ping. The reason I
>> say this is that you would have heard it before with the stock tires
>> in 6th gear, but if you weren't listening for it, you may not have
>> heard it.
>>
>> The way you describe it, it sure sounds like pinging, but in reality
>> it could be someone totally unrelated. Without actually being there to
>> hear it, the only suggestion I can offer is to try filling up again
>> with 89 octane, but either go back to the original gas station, or if
>> it was the same station, ask them if they changed to winter blend fuel
>> already.
>>
>> One other thing I just thought of is to see if you can find fuel with
>> no ethanol added. Some vehicles just don't run decent on the mixed
>> fuels. It usually says right on the pump if there is ethanol added.
>>
>> Chris
>
injectors, but I've never been able to hear them at highway speeds. It
is usually with the hood opened and your head in the engine compartment.
Chris
FrankW wrote:
> On My 05TJ Rubicon
> Sometimes not always I can hear a slight ticking sound
> Kinda like the lifters.
>
> One day when it was really cold outside (-28C)
> I started it without the block heater plugged in
> It made a very loud ticking noise but only for a few seconds
> Someone somewhere said that it wasn't the lifters but something else.
> I forget what he said it was. Something not to worry about though.
> (I think)
> It might have been in the "Rubicon owners forum"
>
> http://www.rubiconownersforum.com/phpbb2/index.php
>
> Try searching there for it if ya want.
>
>
> c wrote:
>> Tracie wrote:
>>
>>> On Sep 24, 12:25 pm, Tracie <brain...@upstate.edu> wrote:
>>>
>>>> Quick question...
>>>>
>>>> 2006 TJ
>>>> 6 speed manual
>>>> 4.0 liter with I-6
>>>> 31/10.50/15 BFGs
>>>>
>>>> When moving along at highway speeds or at lower speeds, does anyone
>>>> else's Wrangler engine sound like a 'rattlesnake' is in there? I am
>>>> not sure if this is pinging or simply just the normal sound of the
>>>> motor. Keep in mind that I do not use my 6th gear on the highway due
>>>> to the 31s. I am travelling along at approximately 65 mph and running
>>>> about 2400-2500 rpms when this sound occurs. If I back off the
>>>> accelerator and get to about 62-63 mph, the sound stops. It's not a
>>>> metallic type sound. Just a 'rattling' or 'purring' type sound. Any
>>>> insight?
>>>
>>>
>>> Sorry but I forgot to add the following....
>>>
>>> Since I have upgraded from 28s to 31s, can that cause the engine to
>>> lug or ping? I generally keep the RPM's around 2200-2400 in 5th gear
>>> (I have a 6 speed). In the higher gears after the engine is warm and
>>> mainly while going uphill (little or big), I get this noise on the
>>> passenger side that sounds VERY similar to the soft top side window
>>> 'pinging' against the metal support bow when the wind blows. I can't
>>> quite distinguish if that's it, or if the engine is pinging because I
>>> am not 100% sure whether it's coming from the front or the back.
>>> It's
>>> a high-pitched noise. It is NOT rhythmic or steady, but rather comes
>>> and goes intermittently. This noise does NOT happen at city/town
>>> speeds of 50 mph or lower. I ran a tank of 89 through her, and it
>>> seemed to be drastically reduced after 1/4 of the tank was used and
>>> for the rest of the 3/4 of the tank. I have now refilled again with
>>> the 89 and the noise is back. I have not used 1/4 of the tank yet,
>>> so
>>> I don't know if it will be reduced again once I get to that point. I
>>> do have a tendecy to 'stuff' as much gas in the tank as I can get
>>> (even after the automatic shuf-off on the spout kicks on). Would
>>> this
>>> be causing the problem too?
>>>
>>
>> Did you get your gas at the same place both times? They shouldn't have
>> done it quite yet, but if a station got a tank of winter blend gas,
>> this could be causing your problem, if it is indeed pinging. By
>> running in 5th gear, you shouldn't be experiencing ping. The reason I
>> say this is that you would have heard it before with the stock tires
>> in 6th gear, but if you weren't listening for it, you may not have
>> heard it.
>>
>> The way you describe it, it sure sounds like pinging, but in reality
>> it could be someone totally unrelated. Without actually being there to
>> hear it, the only suggestion I can offer is to try filling up again
>> with 89 octane, but either go back to the original gas station, or if
>> it was the same station, ask them if they changed to winter blend fuel
>> already.
>>
>> One other thing I just thought of is to see if you can find fuel with
>> no ethanol added. Some vehicles just don't run decent on the mixed
>> fuels. It usually says right on the pump if there is ethanol added.
>>
>> Chris
>
09-24-2007, 05:19 PM
#62
Guest
Posts: n/a
Re: Re: TO PING OR NOT TO PING?
On Mon, 24 Sep 2007 11:04:30 -0700, Tracie <brainart@upstate.edu>
wrote:
>You're right, I really don't have much knowledge of what causes
>pinging. I really do appreciate the fact that you're not being rude
>about it. I was just a little confused though when you said engines
>are more likely to ping at lower RPMs, then in the next paragraph, you
>said that higher RPMs would be all the more reason an engine would
>ping. Those statements contradict themselves (unless I am missing
>something that I don't quite understand).
If I was rude, it was not toward you. I have a running battle with
Mike Romain and some of his very bad advise. The true octane of a
engine as I stated is not a constant. In cooler damp weather you can
get by on less octane than in hot dry weather. I think the confission
you have about knock vs RPM is from I stated that engine are more
prone to ping at lower RPM (lower meaning below 3500 to 4000 RPM)
because of flame speed verse rate of expansion in cylinder from piston
velocity which increases with RPM. Also as I stated engine operating
at or near their torque peak have their highest pumping efficency and
highest cylinder pressures. Higher octane fuel burn a bit slower and
also resists self ignition better for tempatures and pressure in
mixture before and durring a normal burn BTW, the mixture does burn
not explode. When it exploded it creates the load knock that some hear
at times. (this is why diesels rattle because they are in effect
detonation engines)
>
>Any input regarding the 'rattlesnake noise'? It's just a soft
>'purring' type noise. Not real loud at all, but does quit when I back
>off the accelerator just a touch.
The reason you are hearing it then is because the advance is still
rather high for best economy and power at the throttle setting and
octane of fuel is not high enough for that combo and current
environment and you are on the edge of more serious knock. (a little
light ping hear and there is okay you just to not want to sustain it)
Also, ping is very hard on your valves in that it can cause them to
vibrate in their seats and leak and in time cause them to burn. (this
is one of the main causes of burned valves in a otherwise normally
operating engine) Detriot today uses a lot of tricks to try to quell
knock to keep consummers happy with cheap gas with EGR and spark
retatrding being common means. EGR dilutes incoming mixture and
reduces availble oxygen which slows combustion and lowers peak
pressures too to limit NOx and a side benifit is it reduces octane
need a bit but it does reduce efficency too. Retarding spark is used
by basically all brands today as it is easy to do and keeps consumer
happy but it does lower power and MPG. I would suggest you try some 90
ot 91 octane for a while and drop back to lower octane in cooler
weather in fall/winter. (you can mix 87 and 93 together and get 90 for
about same price (50/50 mix) as straight 89.
-----------------
TheSnoMan.com
wrote:
>You're right, I really don't have much knowledge of what causes
>pinging. I really do appreciate the fact that you're not being rude
>about it. I was just a little confused though when you said engines
>are more likely to ping at lower RPMs, then in the next paragraph, you
>said that higher RPMs would be all the more reason an engine would
>ping. Those statements contradict themselves (unless I am missing
>something that I don't quite understand).
If I was rude, it was not toward you. I have a running battle with
Mike Romain and some of his very bad advise. The true octane of a
engine as I stated is not a constant. In cooler damp weather you can
get by on less octane than in hot dry weather. I think the confission
you have about knock vs RPM is from I stated that engine are more
prone to ping at lower RPM (lower meaning below 3500 to 4000 RPM)
because of flame speed verse rate of expansion in cylinder from piston
velocity which increases with RPM. Also as I stated engine operating
at or near their torque peak have their highest pumping efficency and
highest cylinder pressures. Higher octane fuel burn a bit slower and
also resists self ignition better for tempatures and pressure in
mixture before and durring a normal burn BTW, the mixture does burn
not explode. When it exploded it creates the load knock that some hear
at times. (this is why diesels rattle because they are in effect
detonation engines)
>
>Any input regarding the 'rattlesnake noise'? It's just a soft
>'purring' type noise. Not real loud at all, but does quit when I back
>off the accelerator just a touch.
The reason you are hearing it then is because the advance is still
rather high for best economy and power at the throttle setting and
octane of fuel is not high enough for that combo and current
environment and you are on the edge of more serious knock. (a little
light ping hear and there is okay you just to not want to sustain it)
Also, ping is very hard on your valves in that it can cause them to
vibrate in their seats and leak and in time cause them to burn. (this
is one of the main causes of burned valves in a otherwise normally
operating engine) Detriot today uses a lot of tricks to try to quell
knock to keep consummers happy with cheap gas with EGR and spark
retatrding being common means. EGR dilutes incoming mixture and
reduces availble oxygen which slows combustion and lowers peak
pressures too to limit NOx and a side benifit is it reduces octane
need a bit but it does reduce efficency too. Retarding spark is used
by basically all brands today as it is easy to do and keeps consumer
happy but it does lower power and MPG. I would suggest you try some 90
ot 91 octane for a while and drop back to lower octane in cooler
weather in fall/winter. (you can mix 87 and 93 together and get 90 for
about same price (50/50 mix) as straight 89.
-----------------
TheSnoMan.com
09-24-2007, 05:19 PM
#63
Guest
Posts: n/a
Re: Re: TO PING OR NOT TO PING?
On Mon, 24 Sep 2007 11:04:30 -0700, Tracie <brainart@upstate.edu>
wrote:
>You're right, I really don't have much knowledge of what causes
>pinging. I really do appreciate the fact that you're not being rude
>about it. I was just a little confused though when you said engines
>are more likely to ping at lower RPMs, then in the next paragraph, you
>said that higher RPMs would be all the more reason an engine would
>ping. Those statements contradict themselves (unless I am missing
>something that I don't quite understand).
If I was rude, it was not toward you. I have a running battle with
Mike Romain and some of his very bad advise. The true octane of a
engine as I stated is not a constant. In cooler damp weather you can
get by on less octane than in hot dry weather. I think the confission
you have about knock vs RPM is from I stated that engine are more
prone to ping at lower RPM (lower meaning below 3500 to 4000 RPM)
because of flame speed verse rate of expansion in cylinder from piston
velocity which increases with RPM. Also as I stated engine operating
at or near their torque peak have their highest pumping efficency and
highest cylinder pressures. Higher octane fuel burn a bit slower and
also resists self ignition better for tempatures and pressure in
mixture before and durring a normal burn BTW, the mixture does burn
not explode. When it exploded it creates the load knock that some hear
at times. (this is why diesels rattle because they are in effect
detonation engines)
>
>Any input regarding the 'rattlesnake noise'? It's just a soft
>'purring' type noise. Not real loud at all, but does quit when I back
>off the accelerator just a touch.
The reason you are hearing it then is because the advance is still
rather high for best economy and power at the throttle setting and
octane of fuel is not high enough for that combo and current
environment and you are on the edge of more serious knock. (a little
light ping hear and there is okay you just to not want to sustain it)
Also, ping is very hard on your valves in that it can cause them to
vibrate in their seats and leak and in time cause them to burn. (this
is one of the main causes of burned valves in a otherwise normally
operating engine) Detriot today uses a lot of tricks to try to quell
knock to keep consummers happy with cheap gas with EGR and spark
retatrding being common means. EGR dilutes incoming mixture and
reduces availble oxygen which slows combustion and lowers peak
pressures too to limit NOx and a side benifit is it reduces octane
need a bit but it does reduce efficency too. Retarding spark is used
by basically all brands today as it is easy to do and keeps consumer
happy but it does lower power and MPG. I would suggest you try some 90
ot 91 octane for a while and drop back to lower octane in cooler
weather in fall/winter. (you can mix 87 and 93 together and get 90 for
about same price (50/50 mix) as straight 89.
-----------------
TheSnoMan.com
wrote:
>You're right, I really don't have much knowledge of what causes
>pinging. I really do appreciate the fact that you're not being rude
>about it. I was just a little confused though when you said engines
>are more likely to ping at lower RPMs, then in the next paragraph, you
>said that higher RPMs would be all the more reason an engine would
>ping. Those statements contradict themselves (unless I am missing
>something that I don't quite understand).
If I was rude, it was not toward you. I have a running battle with
Mike Romain and some of his very bad advise. The true octane of a
engine as I stated is not a constant. In cooler damp weather you can
get by on less octane than in hot dry weather. I think the confission
you have about knock vs RPM is from I stated that engine are more
prone to ping at lower RPM (lower meaning below 3500 to 4000 RPM)
because of flame speed verse rate of expansion in cylinder from piston
velocity which increases with RPM. Also as I stated engine operating
at or near their torque peak have their highest pumping efficency and
highest cylinder pressures. Higher octane fuel burn a bit slower and
also resists self ignition better for tempatures and pressure in
mixture before and durring a normal burn BTW, the mixture does burn
not explode. When it exploded it creates the load knock that some hear
at times. (this is why diesels rattle because they are in effect
detonation engines)
>
>Any input regarding the 'rattlesnake noise'? It's just a soft
>'purring' type noise. Not real loud at all, but does quit when I back
>off the accelerator just a touch.
The reason you are hearing it then is because the advance is still
rather high for best economy and power at the throttle setting and
octane of fuel is not high enough for that combo and current
environment and you are on the edge of more serious knock. (a little
light ping hear and there is okay you just to not want to sustain it)
Also, ping is very hard on your valves in that it can cause them to
vibrate in their seats and leak and in time cause them to burn. (this
is one of the main causes of burned valves in a otherwise normally
operating engine) Detriot today uses a lot of tricks to try to quell
knock to keep consummers happy with cheap gas with EGR and spark
retatrding being common means. EGR dilutes incoming mixture and
reduces availble oxygen which slows combustion and lowers peak
pressures too to limit NOx and a side benifit is it reduces octane
need a bit but it does reduce efficency too. Retarding spark is used
by basically all brands today as it is easy to do and keeps consumer
happy but it does lower power and MPG. I would suggest you try some 90
ot 91 octane for a while and drop back to lower octane in cooler
weather in fall/winter. (you can mix 87 and 93 together and get 90 for
about same price (50/50 mix) as straight 89.
-----------------
TheSnoMan.com
09-24-2007, 05:19 PM
#64
Guest
Posts: n/a
Re: Re: TO PING OR NOT TO PING?
On Mon, 24 Sep 2007 11:04:30 -0700, Tracie <brainart@upstate.edu>
wrote:
>You're right, I really don't have much knowledge of what causes
>pinging. I really do appreciate the fact that you're not being rude
>about it. I was just a little confused though when you said engines
>are more likely to ping at lower RPMs, then in the next paragraph, you
>said that higher RPMs would be all the more reason an engine would
>ping. Those statements contradict themselves (unless I am missing
>something that I don't quite understand).
If I was rude, it was not toward you. I have a running battle with
Mike Romain and some of his very bad advise. The true octane of a
engine as I stated is not a constant. In cooler damp weather you can
get by on less octane than in hot dry weather. I think the confission
you have about knock vs RPM is from I stated that engine are more
prone to ping at lower RPM (lower meaning below 3500 to 4000 RPM)
because of flame speed verse rate of expansion in cylinder from piston
velocity which increases with RPM. Also as I stated engine operating
at or near their torque peak have their highest pumping efficency and
highest cylinder pressures. Higher octane fuel burn a bit slower and
also resists self ignition better for tempatures and pressure in
mixture before and durring a normal burn BTW, the mixture does burn
not explode. When it exploded it creates the load knock that some hear
at times. (this is why diesels rattle because they are in effect
detonation engines)
>
>Any input regarding the 'rattlesnake noise'? It's just a soft
>'purring' type noise. Not real loud at all, but does quit when I back
>off the accelerator just a touch.
The reason you are hearing it then is because the advance is still
rather high for best economy and power at the throttle setting and
octane of fuel is not high enough for that combo and current
environment and you are on the edge of more serious knock. (a little
light ping hear and there is okay you just to not want to sustain it)
Also, ping is very hard on your valves in that it can cause them to
vibrate in their seats and leak and in time cause them to burn. (this
is one of the main causes of burned valves in a otherwise normally
operating engine) Detriot today uses a lot of tricks to try to quell
knock to keep consummers happy with cheap gas with EGR and spark
retatrding being common means. EGR dilutes incoming mixture and
reduces availble oxygen which slows combustion and lowers peak
pressures too to limit NOx and a side benifit is it reduces octane
need a bit but it does reduce efficency too. Retarding spark is used
by basically all brands today as it is easy to do and keeps consumer
happy but it does lower power and MPG. I would suggest you try some 90
ot 91 octane for a while and drop back to lower octane in cooler
weather in fall/winter. (you can mix 87 and 93 together and get 90 for
about same price (50/50 mix) as straight 89.
-----------------
TheSnoMan.com
wrote:
>You're right, I really don't have much knowledge of what causes
>pinging. I really do appreciate the fact that you're not being rude
>about it. I was just a little confused though when you said engines
>are more likely to ping at lower RPMs, then in the next paragraph, you
>said that higher RPMs would be all the more reason an engine would
>ping. Those statements contradict themselves (unless I am missing
>something that I don't quite understand).
If I was rude, it was not toward you. I have a running battle with
Mike Romain and some of his very bad advise. The true octane of a
engine as I stated is not a constant. In cooler damp weather you can
get by on less octane than in hot dry weather. I think the confission
you have about knock vs RPM is from I stated that engine are more
prone to ping at lower RPM (lower meaning below 3500 to 4000 RPM)
because of flame speed verse rate of expansion in cylinder from piston
velocity which increases with RPM. Also as I stated engine operating
at or near their torque peak have their highest pumping efficency and
highest cylinder pressures. Higher octane fuel burn a bit slower and
also resists self ignition better for tempatures and pressure in
mixture before and durring a normal burn BTW, the mixture does burn
not explode. When it exploded it creates the load knock that some hear
at times. (this is why diesels rattle because they are in effect
detonation engines)
>
>Any input regarding the 'rattlesnake noise'? It's just a soft
>'purring' type noise. Not real loud at all, but does quit when I back
>off the accelerator just a touch.
The reason you are hearing it then is because the advance is still
rather high for best economy and power at the throttle setting and
octane of fuel is not high enough for that combo and current
environment and you are on the edge of more serious knock. (a little
light ping hear and there is okay you just to not want to sustain it)
Also, ping is very hard on your valves in that it can cause them to
vibrate in their seats and leak and in time cause them to burn. (this
is one of the main causes of burned valves in a otherwise normally
operating engine) Detriot today uses a lot of tricks to try to quell
knock to keep consummers happy with cheap gas with EGR and spark
retatrding being common means. EGR dilutes incoming mixture and
reduces availble oxygen which slows combustion and lowers peak
pressures too to limit NOx and a side benifit is it reduces octane
need a bit but it does reduce efficency too. Retarding spark is used
by basically all brands today as it is easy to do and keeps consumer
happy but it does lower power and MPG. I would suggest you try some 90
ot 91 octane for a while and drop back to lower octane in cooler
weather in fall/winter. (you can mix 87 and 93 together and get 90 for
about same price (50/50 mix) as straight 89.
-----------------
TheSnoMan.com
09-24-2007, 05:19 PM
#65
Guest
Posts: n/a
Re: Re: TO PING OR NOT TO PING?
On Mon, 24 Sep 2007 11:04:30 -0700, Tracie <brainart@upstate.edu>
wrote:
>You're right, I really don't have much knowledge of what causes
>pinging. I really do appreciate the fact that you're not being rude
>about it. I was just a little confused though when you said engines
>are more likely to ping at lower RPMs, then in the next paragraph, you
>said that higher RPMs would be all the more reason an engine would
>ping. Those statements contradict themselves (unless I am missing
>something that I don't quite understand).
If I was rude, it was not toward you. I have a running battle with
Mike Romain and some of his very bad advise. The true octane of a
engine as I stated is not a constant. In cooler damp weather you can
get by on less octane than in hot dry weather. I think the confission
you have about knock vs RPM is from I stated that engine are more
prone to ping at lower RPM (lower meaning below 3500 to 4000 RPM)
because of flame speed verse rate of expansion in cylinder from piston
velocity which increases with RPM. Also as I stated engine operating
at or near their torque peak have their highest pumping efficency and
highest cylinder pressures. Higher octane fuel burn a bit slower and
also resists self ignition better for tempatures and pressure in
mixture before and durring a normal burn BTW, the mixture does burn
not explode. When it exploded it creates the load knock that some hear
at times. (this is why diesels rattle because they are in effect
detonation engines)
>
>Any input regarding the 'rattlesnake noise'? It's just a soft
>'purring' type noise. Not real loud at all, but does quit when I back
>off the accelerator just a touch.
The reason you are hearing it then is because the advance is still
rather high for best economy and power at the throttle setting and
octane of fuel is not high enough for that combo and current
environment and you are on the edge of more serious knock. (a little
light ping hear and there is okay you just to not want to sustain it)
Also, ping is very hard on your valves in that it can cause them to
vibrate in their seats and leak and in time cause them to burn. (this
is one of the main causes of burned valves in a otherwise normally
operating engine) Detriot today uses a lot of tricks to try to quell
knock to keep consummers happy with cheap gas with EGR and spark
retatrding being common means. EGR dilutes incoming mixture and
reduces availble oxygen which slows combustion and lowers peak
pressures too to limit NOx and a side benifit is it reduces octane
need a bit but it does reduce efficency too. Retarding spark is used
by basically all brands today as it is easy to do and keeps consumer
happy but it does lower power and MPG. I would suggest you try some 90
ot 91 octane for a while and drop back to lower octane in cooler
weather in fall/winter. (you can mix 87 and 93 together and get 90 for
about same price (50/50 mix) as straight 89.
-----------------
TheSnoMan.com
wrote:
>You're right, I really don't have much knowledge of what causes
>pinging. I really do appreciate the fact that you're not being rude
>about it. I was just a little confused though when you said engines
>are more likely to ping at lower RPMs, then in the next paragraph, you
>said that higher RPMs would be all the more reason an engine would
>ping. Those statements contradict themselves (unless I am missing
>something that I don't quite understand).
If I was rude, it was not toward you. I have a running battle with
Mike Romain and some of his very bad advise. The true octane of a
engine as I stated is not a constant. In cooler damp weather you can
get by on less octane than in hot dry weather. I think the confission
you have about knock vs RPM is from I stated that engine are more
prone to ping at lower RPM (lower meaning below 3500 to 4000 RPM)
because of flame speed verse rate of expansion in cylinder from piston
velocity which increases with RPM. Also as I stated engine operating
at or near their torque peak have their highest pumping efficency and
highest cylinder pressures. Higher octane fuel burn a bit slower and
also resists self ignition better for tempatures and pressure in
mixture before and durring a normal burn BTW, the mixture does burn
not explode. When it exploded it creates the load knock that some hear
at times. (this is why diesels rattle because they are in effect
detonation engines)
>
>Any input regarding the 'rattlesnake noise'? It's just a soft
>'purring' type noise. Not real loud at all, but does quit when I back
>off the accelerator just a touch.
The reason you are hearing it then is because the advance is still
rather high for best economy and power at the throttle setting and
octane of fuel is not high enough for that combo and current
environment and you are on the edge of more serious knock. (a little
light ping hear and there is okay you just to not want to sustain it)
Also, ping is very hard on your valves in that it can cause them to
vibrate in their seats and leak and in time cause them to burn. (this
is one of the main causes of burned valves in a otherwise normally
operating engine) Detriot today uses a lot of tricks to try to quell
knock to keep consummers happy with cheap gas with EGR and spark
retatrding being common means. EGR dilutes incoming mixture and
reduces availble oxygen which slows combustion and lowers peak
pressures too to limit NOx and a side benifit is it reduces octane
need a bit but it does reduce efficency too. Retarding spark is used
by basically all brands today as it is easy to do and keeps consumer
happy but it does lower power and MPG. I would suggest you try some 90
ot 91 octane for a while and drop back to lower octane in cooler
weather in fall/winter. (you can mix 87 and 93 together and get 90 for
about same price (50/50 mix) as straight 89.
-----------------
TheSnoMan.com
09-24-2007, 05:48 PM
#66
Guest
Posts: n/a
Re: TO PING OR NOT TO PING?
On Sep 24, 9:25 am, Tracie <brain...@upstate.edu> wrote:
> Quick question...
>
> 2006 TJ
> 6 speed manual
> 4.0 liter with I-6
> 31/10.50/15 BFGs
>
> When moving along at highway speeds or at lower speeds, does anyone
> else's Wrangler engine sound like a 'rattlesnake' is in there? I am
> not sure if this is pinging or simply just the normal sound of the
> motor. Keep in mind that I do not use my 6th gear on the highway due
> to the 31s. I am travelling along at approximately 65 mph and running
> about 2400-2500 rpms when this sound occurs. If I back off the
> accelerator and get to about 62-63 mph, the sound stops. It's not a
> metallic type sound. Just a 'rattling' or 'purring' type sound. Any
> insight?
Well, it is an 06. Why not have the dealer deal with it. Or atleast
see what their 'experts' have to say.
> Quick question...
>
> 2006 TJ
> 6 speed manual
> 4.0 liter with I-6
> 31/10.50/15 BFGs
>
> When moving along at highway speeds or at lower speeds, does anyone
> else's Wrangler engine sound like a 'rattlesnake' is in there? I am
> not sure if this is pinging or simply just the normal sound of the
> motor. Keep in mind that I do not use my 6th gear on the highway due
> to the 31s. I am travelling along at approximately 65 mph and running
> about 2400-2500 rpms when this sound occurs. If I back off the
> accelerator and get to about 62-63 mph, the sound stops. It's not a
> metallic type sound. Just a 'rattling' or 'purring' type sound. Any
> insight?
Well, it is an 06. Why not have the dealer deal with it. Or atleast
see what their 'experts' have to say.
09-24-2007, 05:48 PM
#67
Guest
Posts: n/a
Re: TO PING OR NOT TO PING?
On Sep 24, 9:25 am, Tracie <brain...@upstate.edu> wrote:
> Quick question...
>
> 2006 TJ
> 6 speed manual
> 4.0 liter with I-6
> 31/10.50/15 BFGs
>
> When moving along at highway speeds or at lower speeds, does anyone
> else's Wrangler engine sound like a 'rattlesnake' is in there? I am
> not sure if this is pinging or simply just the normal sound of the
> motor. Keep in mind that I do not use my 6th gear on the highway due
> to the 31s. I am travelling along at approximately 65 mph and running
> about 2400-2500 rpms when this sound occurs. If I back off the
> accelerator and get to about 62-63 mph, the sound stops. It's not a
> metallic type sound. Just a 'rattling' or 'purring' type sound. Any
> insight?
Well, it is an 06. Why not have the dealer deal with it. Or atleast
see what their 'experts' have to say.
> Quick question...
>
> 2006 TJ
> 6 speed manual
> 4.0 liter with I-6
> 31/10.50/15 BFGs
>
> When moving along at highway speeds or at lower speeds, does anyone
> else's Wrangler engine sound like a 'rattlesnake' is in there? I am
> not sure if this is pinging or simply just the normal sound of the
> motor. Keep in mind that I do not use my 6th gear on the highway due
> to the 31s. I am travelling along at approximately 65 mph and running
> about 2400-2500 rpms when this sound occurs. If I back off the
> accelerator and get to about 62-63 mph, the sound stops. It's not a
> metallic type sound. Just a 'rattling' or 'purring' type sound. Any
> insight?
Well, it is an 06. Why not have the dealer deal with it. Or atleast
see what their 'experts' have to say.
09-24-2007, 05:48 PM
#68
Guest
Posts: n/a
Re: TO PING OR NOT TO PING?
On Sep 24, 9:25 am, Tracie <brain...@upstate.edu> wrote:
> Quick question...
>
> 2006 TJ
> 6 speed manual
> 4.0 liter with I-6
> 31/10.50/15 BFGs
>
> When moving along at highway speeds or at lower speeds, does anyone
> else's Wrangler engine sound like a 'rattlesnake' is in there? I am
> not sure if this is pinging or simply just the normal sound of the
> motor. Keep in mind that I do not use my 6th gear on the highway due
> to the 31s. I am travelling along at approximately 65 mph and running
> about 2400-2500 rpms when this sound occurs. If I back off the
> accelerator and get to about 62-63 mph, the sound stops. It's not a
> metallic type sound. Just a 'rattling' or 'purring' type sound. Any
> insight?
Well, it is an 06. Why not have the dealer deal with it. Or atleast
see what their 'experts' have to say.
> Quick question...
>
> 2006 TJ
> 6 speed manual
> 4.0 liter with I-6
> 31/10.50/15 BFGs
>
> When moving along at highway speeds or at lower speeds, does anyone
> else's Wrangler engine sound like a 'rattlesnake' is in there? I am
> not sure if this is pinging or simply just the normal sound of the
> motor. Keep in mind that I do not use my 6th gear on the highway due
> to the 31s. I am travelling along at approximately 65 mph and running
> about 2400-2500 rpms when this sound occurs. If I back off the
> accelerator and get to about 62-63 mph, the sound stops. It's not a
> metallic type sound. Just a 'rattling' or 'purring' type sound. Any
> insight?
Well, it is an 06. Why not have the dealer deal with it. Or atleast
see what their 'experts' have to say.
09-24-2007, 05:48 PM
#69
Guest
Posts: n/a
Re: TO PING OR NOT TO PING?
On Sep 24, 9:25 am, Tracie <brain...@upstate.edu> wrote:
> Quick question...
>
> 2006 TJ
> 6 speed manual
> 4.0 liter with I-6
> 31/10.50/15 BFGs
>
> When moving along at highway speeds or at lower speeds, does anyone
> else's Wrangler engine sound like a 'rattlesnake' is in there? I am
> not sure if this is pinging or simply just the normal sound of the
> motor. Keep in mind that I do not use my 6th gear on the highway due
> to the 31s. I am travelling along at approximately 65 mph and running
> about 2400-2500 rpms when this sound occurs. If I back off the
> accelerator and get to about 62-63 mph, the sound stops. It's not a
> metallic type sound. Just a 'rattling' or 'purring' type sound. Any
> insight?
Well, it is an 06. Why not have the dealer deal with it. Or atleast
see what their 'experts' have to say.
> Quick question...
>
> 2006 TJ
> 6 speed manual
> 4.0 liter with I-6
> 31/10.50/15 BFGs
>
> When moving along at highway speeds or at lower speeds, does anyone
> else's Wrangler engine sound like a 'rattlesnake' is in there? I am
> not sure if this is pinging or simply just the normal sound of the
> motor. Keep in mind that I do not use my 6th gear on the highway due
> to the 31s. I am travelling along at approximately 65 mph and running
> about 2400-2500 rpms when this sound occurs. If I back off the
> accelerator and get to about 62-63 mph, the sound stops. It's not a
> metallic type sound. Just a 'rattling' or 'purring' type sound. Any
> insight?
Well, it is an 06. Why not have the dealer deal with it. Or atleast
see what their 'experts' have to say.
09-24-2007, 05:51 PM
#70
Guest
Posts: n/a
Re: Re: TO PING OR NOT TO PING?
He's been in mine since he started his BS in alt.trucks.ford...
"Earle Horton" <el_anglo_burgues@usa.com> wrote in message
news:fd995u$6ds$1@registered.motzarella.org...
> Funny, there isn't much difference between Hispanic newsgroups and Anglo
> newsgroups. I kept expecting to see "hijo de puta" in Snoball's message.
> I
> put him back in my kill file of course.
>
> Saludos,
>
> Earle
>
> "Carl S" <carlsaiyed@REMOVE.hotmail.com> wrote in message
> news:h_udnRsI-atXj2XbnZ2dnUVZ_gidnZ2d@comcast.com...
>> Sno,
>>
>> I, for one, appreciate your knowledge and contribution to the group,
> but
>> statements like "You would know this if you had any realy knowledge of
>> this." and "Of course you would because you are clueless here" are
>> irrelevant and worthless.
>>
>> Carl
>>
>>
>> "SnoMan" <admin@snoman.com> wrote in message
>> news:rtsff3dqj6qg7qf4imrf28v8c2uo0ivdi1@4ax.com...
>> > On Mon, 24 Sep 2007 13:07:48 -0400, Mike Romain <romainm@sympatico.ca>
>> > wrote:
>> >
>> >>I highly doubt you can make a 4.0 engine ping at 2500 rpm under almost
>> >>any driving condition.
>> >
>> > Engine are more prone to ping at lower RPMs when rate of expansion is
>> > slower and load is high. You would know this if you had any realy
>> > knowledge of this.
>> >
>> >>
>> >>At that rpm, you are way up in the torque curve and should have tons of
>> >>power to accelerate uphill fast even using regular gas.
>> >
>> > All the more reason it can ping because when engine is making good
>> > torque it is near its VE peak (Volumetric Efficency) where effective
>> > pumping pressure are the highest for its mixtures being burned and
>> > these higher pressure need more octane
>> >
>> >>
>> >>My Jeeps have tons of power when fully loaded for camping at that rpm,
>> >>they will 'hold' 2300 rpm at least on anything.
>> >
>> > I take this with a grain of salt since you think 3.31 gears with 33's
>> > is a great combo, you really do not have a clue what good pulling
>> > power is. (you have very low standards)
>> >
>> >>
>> >>I would be suspecting something else is making the noise.
>> >
>> > Of course you would because you are clueless here
>> >
>> >>
>> >>I can only start a ping if I am way down into the mid teens for rpm or
>> >>have gas my CJ7's 258 doesn't like in it. (old carb engine, apples and
>> >>oranges to a 4.0's systems)
>> >
>> > How much octane you need depends on engine temp, air temp, load,
>> > humidity, altitude and well as deposits in engine from age and minute
>> > oil usage too which lowers octane needs. Octane needs are not constant
>> > and the trick is to use a high enough octane to meet maximum needs.
>> > What people need themselves can vary and is not universal 87 does it
>> > all as clueless here suggests. BTW, I do not use 87 in anything made
>> > since early 80's.
>> >
>> >>
>> >>Mike
>> >>86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
>> >>88 Cherokee 235 BFG AT's - Gone to the rust pile...
>> >>Canadian Off Road Trips Photos: Non members can still view!
>> >>Jan/06 http://www.imagestation.com/album/pi...?id=2115147590
>> >>(More Off Road album links at bottom of the view page)
>> >>
>> >>Tracie wrote:
>> >>> On Sep 24, 12:25 pm, Tracie <brain...@upstate.edu> wrote:
>> >>>> Quick question...
>> >>>>
>> >>>> 2006 TJ
>> >>>> 6 speed manual
>> >>>> 4.0 liter with I-6
>> >>>> 31/10.50/15 BFGs
>> >>>>
>> >>>> When moving along at highway speeds or at lower speeds, does anyone
>> >>>> else's Wrangler engine sound like a 'rattlesnake' is in there? I am
>> >>>> not sure if this is pinging or simply just the normal sound of the
>> >>>> motor. Keep in mind that I do not use my 6th gear on the highway
>> >>>> due
>> >>>> to the 31s. I am travelling along at approximately 65 mph and
> running
>> >>>> about 2400-2500 rpms when this sound occurs. If I back off the
>> >>>> accelerator and get to about 62-63 mph, the sound stops. It's not a
>> >>>> metallic type sound. Just a 'rattling' or 'purring' type sound.
>> >>>> Any
>> >>>> insight?
>> >>>
>> >>> Sorry but I forgot to add the following....
>> >>>
>> >>> Since I have upgraded from 28s to 31s, can that cause the engine to
>> >>> lug or ping? I generally keep the RPM's around 2200-2400 in 5th gear
>> >>> (I have a 6 speed). In the higher gears after the engine is warm and
>> >>> mainly while going uphill (little or big), I get this noise on the
>> >>> passenger side that sounds VERY similar to the soft top side window
>> >>> 'pinging' against the metal support bow when the wind blows. I can't
>> >>> quite distinguish if that's it, or if the engine is pinging because I
>> >>> am not 100% sure whether it's coming from the front or the back.
>> >>> It's
>> >>> a high-pitched noise. It is NOT rhythmic or steady, but rather comes
>> >>> and goes intermittently. This noise does NOT happen at city/town
>> >>> speeds of 50 mph or lower. I ran a tank of 89 through her, and it
>> >>> seemed to be drastically reduced after 1/4 of the tank was used and
>> >>> for the rest of the 3/4 of the tank. I have now refilled again with
>> >>> the 89 and the noise is back. I have not used 1/4 of the tank yet,
>> >>> so
>> >>> I don't know if it will be reduced again once I get to that point. I
>> >>> do have a tendecy to 'stuff' as much gas in the tank as I can get
>> >>> (even after the automatic shuf-off on the spout kicks on). Would
>> >>> this
>> >>> be causing the problem too?
>> >>>
>> > -----------------
>> > TheSnoMan.com
>>
>>
>
>
"Earle Horton" <el_anglo_burgues@usa.com> wrote in message
news:fd995u$6ds$1@registered.motzarella.org...
> Funny, there isn't much difference between Hispanic newsgroups and Anglo
> newsgroups. I kept expecting to see "hijo de puta" in Snoball's message.
> I
> put him back in my kill file of course.
>
> Saludos,
>
> Earle
>
> "Carl S" <carlsaiyed@REMOVE.hotmail.com> wrote in message
> news:h_udnRsI-atXj2XbnZ2dnUVZ_gidnZ2d@comcast.com...
>> Sno,
>>
>> I, for one, appreciate your knowledge and contribution to the group,
> but
>> statements like "You would know this if you had any realy knowledge of
>> this." and "Of course you would because you are clueless here" are
>> irrelevant and worthless.
>>
>> Carl
>>
>>
>> "SnoMan" <admin@snoman.com> wrote in message
>> news:rtsff3dqj6qg7qf4imrf28v8c2uo0ivdi1@4ax.com...
>> > On Mon, 24 Sep 2007 13:07:48 -0400, Mike Romain <romainm@sympatico.ca>
>> > wrote:
>> >
>> >>I highly doubt you can make a 4.0 engine ping at 2500 rpm under almost
>> >>any driving condition.
>> >
>> > Engine are more prone to ping at lower RPMs when rate of expansion is
>> > slower and load is high. You would know this if you had any realy
>> > knowledge of this.
>> >
>> >>
>> >>At that rpm, you are way up in the torque curve and should have tons of
>> >>power to accelerate uphill fast even using regular gas.
>> >
>> > All the more reason it can ping because when engine is making good
>> > torque it is near its VE peak (Volumetric Efficency) where effective
>> > pumping pressure are the highest for its mixtures being burned and
>> > these higher pressure need more octane
>> >
>> >>
>> >>My Jeeps have tons of power when fully loaded for camping at that rpm,
>> >>they will 'hold' 2300 rpm at least on anything.
>> >
>> > I take this with a grain of salt since you think 3.31 gears with 33's
>> > is a great combo, you really do not have a clue what good pulling
>> > power is. (you have very low standards)
>> >
>> >>
>> >>I would be suspecting something else is making the noise.
>> >
>> > Of course you would because you are clueless here
>> >
>> >>
>> >>I can only start a ping if I am way down into the mid teens for rpm or
>> >>have gas my CJ7's 258 doesn't like in it. (old carb engine, apples and
>> >>oranges to a 4.0's systems)
>> >
>> > How much octane you need depends on engine temp, air temp, load,
>> > humidity, altitude and well as deposits in engine from age and minute
>> > oil usage too which lowers octane needs. Octane needs are not constant
>> > and the trick is to use a high enough octane to meet maximum needs.
>> > What people need themselves can vary and is not universal 87 does it
>> > all as clueless here suggests. BTW, I do not use 87 in anything made
>> > since early 80's.
>> >
>> >>
>> >>Mike
>> >>86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
>> >>88 Cherokee 235 BFG AT's - Gone to the rust pile...
>> >>Canadian Off Road Trips Photos: Non members can still view!
>> >>Jan/06 http://www.imagestation.com/album/pi...?id=2115147590
>> >>(More Off Road album links at bottom of the view page)
>> >>
>> >>Tracie wrote:
>> >>> On Sep 24, 12:25 pm, Tracie <brain...@upstate.edu> wrote:
>> >>>> Quick question...
>> >>>>
>> >>>> 2006 TJ
>> >>>> 6 speed manual
>> >>>> 4.0 liter with I-6
>> >>>> 31/10.50/15 BFGs
>> >>>>
>> >>>> When moving along at highway speeds or at lower speeds, does anyone
>> >>>> else's Wrangler engine sound like a 'rattlesnake' is in there? I am
>> >>>> not sure if this is pinging or simply just the normal sound of the
>> >>>> motor. Keep in mind that I do not use my 6th gear on the highway
>> >>>> due
>> >>>> to the 31s. I am travelling along at approximately 65 mph and
> running
>> >>>> about 2400-2500 rpms when this sound occurs. If I back off the
>> >>>> accelerator and get to about 62-63 mph, the sound stops. It's not a
>> >>>> metallic type sound. Just a 'rattling' or 'purring' type sound.
>> >>>> Any
>> >>>> insight?
>> >>>
>> >>> Sorry but I forgot to add the following....
>> >>>
>> >>> Since I have upgraded from 28s to 31s, can that cause the engine to
>> >>> lug or ping? I generally keep the RPM's around 2200-2400 in 5th gear
>> >>> (I have a 6 speed). In the higher gears after the engine is warm and
>> >>> mainly while going uphill (little or big), I get this noise on the
>> >>> passenger side that sounds VERY similar to the soft top side window
>> >>> 'pinging' against the metal support bow when the wind blows. I can't
>> >>> quite distinguish if that's it, or if the engine is pinging because I
>> >>> am not 100% sure whether it's coming from the front or the back.
>> >>> It's
>> >>> a high-pitched noise. It is NOT rhythmic or steady, but rather comes
>> >>> and goes intermittently. This noise does NOT happen at city/town
>> >>> speeds of 50 mph or lower. I ran a tank of 89 through her, and it
>> >>> seemed to be drastically reduced after 1/4 of the tank was used and
>> >>> for the rest of the 3/4 of the tank. I have now refilled again with
>> >>> the 89 and the noise is back. I have not used 1/4 of the tank yet,
>> >>> so
>> >>> I don't know if it will be reduced again once I get to that point. I
>> >>> do have a tendecy to 'stuff' as much gas in the tank as I can get
>> >>> (even after the automatic shuf-off on the spout kicks on). Would
>> >>> this
>> >>> be causing the problem too?
>> >>>
>> > -----------------
>> > TheSnoMan.com
>>
>>
>
>