Jeep runs better in sunny days
Guest
Posts: n/a
Re: Jeep runs better in sunny days
They also ran better on cloudy days / rainy days due to the high
humidity that contributes to the 'octane number'. The humidity helps
to slow the flame front propagation in the combustion chamber .... just
like adding extra octane. Should be the same with EFI as that doesnt
sense the change in mass flow rate due to the less dense 'wet' air
intake. Air saturated with water vapor is less dense than dry air, etc.
So just WHERE in hell can I buy some metering rods (Rochestier
Vari-Jet Carb) of varying thickness and taper ... so I dont have to
machine new ones? .... and I dont have a jewelers lathe.
In article <4228057A.75BD7980@***.net>, ßill <----------@***.net> wrote:
> Hi Herb,
> In the old days carburated cars did run better with colder air
> induction leading more gases expansion, equally more power. So if your
> computer could compensate for the higher pressure, like supercharging an
> engine would lead to more power. You should put it on a wheel
> dynamometer to see if it's in your imagination. This reminds me I once
> own an '84 Ford that's barometer had failed and it would quit every time
> rain was forecast.
> God Bless America, ßill O|||||||O
> mailto:-------------------- http://www.----------.com/
>
> Herb wrote:
> >
> > I have a 92 cherokee, 4L auto, 320,000km. I can feel it has more horse power
> > in sunny days. In wet days it's lack of power.
> > I changed plugs, ignitions wires, cap and roters 30,000km before.
> > Anything I need to look into?
> >
> > thank you in advance.
> >
> > Herb
humidity that contributes to the 'octane number'. The humidity helps
to slow the flame front propagation in the combustion chamber .... just
like adding extra octane. Should be the same with EFI as that doesnt
sense the change in mass flow rate due to the less dense 'wet' air
intake. Air saturated with water vapor is less dense than dry air, etc.
So just WHERE in hell can I buy some metering rods (Rochestier
Vari-Jet Carb) of varying thickness and taper ... so I dont have to
machine new ones? .... and I dont have a jewelers lathe.
In article <4228057A.75BD7980@***.net>, ßill <----------@***.net> wrote:
> Hi Herb,
> In the old days carburated cars did run better with colder air
> induction leading more gases expansion, equally more power. So if your
> computer could compensate for the higher pressure, like supercharging an
> engine would lead to more power. You should put it on a wheel
> dynamometer to see if it's in your imagination. This reminds me I once
> own an '84 Ford that's barometer had failed and it would quit every time
> rain was forecast.
> God Bless America, ßill O|||||||O
> mailto:-------------------- http://www.----------.com/
>
> Herb wrote:
> >
> > I have a 92 cherokee, 4L auto, 320,000km. I can feel it has more horse power
> > in sunny days. In wet days it's lack of power.
> > I changed plugs, ignitions wires, cap and roters 30,000km before.
> > Anything I need to look into?
> >
> > thank you in advance.
> >
> > Herb
Guest
Posts: n/a
Re: Jeep runs better in sunny days
They also ran better on cloudy days / rainy days due to the high
humidity that contributes to the 'octane number'. The humidity helps
to slow the flame front propagation in the combustion chamber .... just
like adding extra octane. Should be the same with EFI as that doesnt
sense the change in mass flow rate due to the less dense 'wet' air
intake. Air saturated with water vapor is less dense than dry air, etc.
So just WHERE in hell can I buy some metering rods (Rochestier
Vari-Jet Carb) of varying thickness and taper ... so I dont have to
machine new ones? .... and I dont have a jewelers lathe.
In article <4228057A.75BD7980@***.net>, ßill <----------@***.net> wrote:
> Hi Herb,
> In the old days carburated cars did run better with colder air
> induction leading more gases expansion, equally more power. So if your
> computer could compensate for the higher pressure, like supercharging an
> engine would lead to more power. You should put it on a wheel
> dynamometer to see if it's in your imagination. This reminds me I once
> own an '84 Ford that's barometer had failed and it would quit every time
> rain was forecast.
> God Bless America, ßill O|||||||O
> mailto:-------------------- http://www.----------.com/
>
> Herb wrote:
> >
> > I have a 92 cherokee, 4L auto, 320,000km. I can feel it has more horse power
> > in sunny days. In wet days it's lack of power.
> > I changed plugs, ignitions wires, cap and roters 30,000km before.
> > Anything I need to look into?
> >
> > thank you in advance.
> >
> > Herb
humidity that contributes to the 'octane number'. The humidity helps
to slow the flame front propagation in the combustion chamber .... just
like adding extra octane. Should be the same with EFI as that doesnt
sense the change in mass flow rate due to the less dense 'wet' air
intake. Air saturated with water vapor is less dense than dry air, etc.
So just WHERE in hell can I buy some metering rods (Rochestier
Vari-Jet Carb) of varying thickness and taper ... so I dont have to
machine new ones? .... and I dont have a jewelers lathe.
In article <4228057A.75BD7980@***.net>, ßill <----------@***.net> wrote:
> Hi Herb,
> In the old days carburated cars did run better with colder air
> induction leading more gases expansion, equally more power. So if your
> computer could compensate for the higher pressure, like supercharging an
> engine would lead to more power. You should put it on a wheel
> dynamometer to see if it's in your imagination. This reminds me I once
> own an '84 Ford that's barometer had failed and it would quit every time
> rain was forecast.
> God Bless America, ßill O|||||||O
> mailto:-------------------- http://www.----------.com/
>
> Herb wrote:
> >
> > I have a 92 cherokee, 4L auto, 320,000km. I can feel it has more horse power
> > in sunny days. In wet days it's lack of power.
> > I changed plugs, ignitions wires, cap and roters 30,000km before.
> > Anything I need to look into?
> >
> > thank you in advance.
> >
> > Herb
Guest
Posts: n/a
Re: Jeep runs better in sunny days
They also ran better on cloudy days / rainy days due to the high
humidity that contributes to the 'octane number'. The humidity helps
to slow the flame front propagation in the combustion chamber .... just
like adding extra octane. Should be the same with EFI as that doesnt
sense the change in mass flow rate due to the less dense 'wet' air
intake. Air saturated with water vapor is less dense than dry air, etc.
So just WHERE in hell can I buy some metering rods (Rochestier
Vari-Jet Carb) of varying thickness and taper ... so I dont have to
machine new ones? .... and I dont have a jewelers lathe.
In article <4228057A.75BD7980@***.net>, ßill <----------@***.net> wrote:
> Hi Herb,
> In the old days carburated cars did run better with colder air
> induction leading more gases expansion, equally more power. So if your
> computer could compensate for the higher pressure, like supercharging an
> engine would lead to more power. You should put it on a wheel
> dynamometer to see if it's in your imagination. This reminds me I once
> own an '84 Ford that's barometer had failed and it would quit every time
> rain was forecast.
> God Bless America, ßill O|||||||O
> mailto:-------------------- http://www.----------.com/
>
> Herb wrote:
> >
> > I have a 92 cherokee, 4L auto, 320,000km. I can feel it has more horse power
> > in sunny days. In wet days it's lack of power.
> > I changed plugs, ignitions wires, cap and roters 30,000km before.
> > Anything I need to look into?
> >
> > thank you in advance.
> >
> > Herb
humidity that contributes to the 'octane number'. The humidity helps
to slow the flame front propagation in the combustion chamber .... just
like adding extra octane. Should be the same with EFI as that doesnt
sense the change in mass flow rate due to the less dense 'wet' air
intake. Air saturated with water vapor is less dense than dry air, etc.
So just WHERE in hell can I buy some metering rods (Rochestier
Vari-Jet Carb) of varying thickness and taper ... so I dont have to
machine new ones? .... and I dont have a jewelers lathe.
In article <4228057A.75BD7980@***.net>, ßill <----------@***.net> wrote:
> Hi Herb,
> In the old days carburated cars did run better with colder air
> induction leading more gases expansion, equally more power. So if your
> computer could compensate for the higher pressure, like supercharging an
> engine would lead to more power. You should put it on a wheel
> dynamometer to see if it's in your imagination. This reminds me I once
> own an '84 Ford that's barometer had failed and it would quit every time
> rain was forecast.
> God Bless America, ßill O|||||||O
> mailto:-------------------- http://www.----------.com/
>
> Herb wrote:
> >
> > I have a 92 cherokee, 4L auto, 320,000km. I can feel it has more horse power
> > in sunny days. In wet days it's lack of power.
> > I changed plugs, ignitions wires, cap and roters 30,000km before.
> > Anything I need to look into?
> >
> > thank you in advance.
> >
> > Herb
Guest
Posts: n/a
Re: Jeep runs better in sunny days
In the old days the rule of thumb, was drill the stock main jets
ten percent over, probably about half of that for you with a metering
rod going through it. That was for the stock classes at a drag strip.
God Bless America, ßill O|||||||O
mailto:-------------------- http://www.----------.com/
Rich Hampel wrote:
>
><snip>
>
> So just WHERE in hell can I buy some metering rods (Rochestier
> Vari-Jet Carb) of varying thickness and taper ... so I dont have to
> machine new ones? .... and I dont have a jewelers lathe.
ten percent over, probably about half of that for you with a metering
rod going through it. That was for the stock classes at a drag strip.
God Bless America, ßill O|||||||O
mailto:-------------------- http://www.----------.com/
Rich Hampel wrote:
>
><snip>
>
> So just WHERE in hell can I buy some metering rods (Rochestier
> Vari-Jet Carb) of varying thickness and taper ... so I dont have to
> machine new ones? .... and I dont have a jewelers lathe.
Guest
Posts: n/a
Re: Jeep runs better in sunny days
In the old days the rule of thumb, was drill the stock main jets
ten percent over, probably about half of that for you with a metering
rod going through it. That was for the stock classes at a drag strip.
God Bless America, ßill O|||||||O
mailto:-------------------- http://www.----------.com/
Rich Hampel wrote:
>
><snip>
>
> So just WHERE in hell can I buy some metering rods (Rochestier
> Vari-Jet Carb) of varying thickness and taper ... so I dont have to
> machine new ones? .... and I dont have a jewelers lathe.
ten percent over, probably about half of that for you with a metering
rod going through it. That was for the stock classes at a drag strip.
God Bless America, ßill O|||||||O
mailto:-------------------- http://www.----------.com/
Rich Hampel wrote:
>
><snip>
>
> So just WHERE in hell can I buy some metering rods (Rochestier
> Vari-Jet Carb) of varying thickness and taper ... so I dont have to
> machine new ones? .... and I dont have a jewelers lathe.
Guest
Posts: n/a
Re: Jeep runs better in sunny days
In the old days the rule of thumb, was drill the stock main jets
ten percent over, probably about half of that for you with a metering
rod going through it. That was for the stock classes at a drag strip.
God Bless America, ßill O|||||||O
mailto:-------------------- http://www.----------.com/
Rich Hampel wrote:
>
><snip>
>
> So just WHERE in hell can I buy some metering rods (Rochestier
> Vari-Jet Carb) of varying thickness and taper ... so I dont have to
> machine new ones? .... and I dont have a jewelers lathe.
ten percent over, probably about half of that for you with a metering
rod going through it. That was for the stock classes at a drag strip.
God Bless America, ßill O|||||||O
mailto:-------------------- http://www.----------.com/
Rich Hampel wrote:
>
><snip>
>
> So just WHERE in hell can I buy some metering rods (Rochestier
> Vari-Jet Carb) of varying thickness and taper ... so I dont have to
> machine new ones? .... and I dont have a jewelers lathe.
Guest
Posts: n/a
Re: Jeep runs better in sunny days
thank you everyone for the input. I don't believe it's my imagination. I
drive it everyday, I know in dry day, it gets more power.
Mike, I bought the plugs, cap, roter, and wires from the dealership. the air
filter was changed 10,000km before.
Is it possible the wires cracked(which I did not check) not insulated, or
the end of the wires not fully pushed into the plugs.
"Mike Romain" <romainm@sympatico.ca> wrote in message
news:42288892.93CC4A86@sympatico.ca...
> How is the air filter? When they get older humidity can affect the air
> flow through the dust.
>
> I don't know what plugs you used, but I have seen a pile of those
> expensive bosch platinum plugs burn out fast in the 4.0 and 4.2
> engines. They last for 6 month or a year, then the engine power up and
> dies. The best is a Champion in my opinion.
>
> Mike
> 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> 88 Cherokee 235 BFG AT's
>
> Herb wrote:
>>
>> I have a 92 cherokee, 4L auto, 320,000km. I can feel it has more horse
>> power
>> in sunny days. In wet days it's lack of power.
>> I changed plugs, ignitions wires, cap and roters 30,000km before.
>> Anything I need to look into?
>>
>> thank you in advance.
>>
>> Herb
drive it everyday, I know in dry day, it gets more power.
Mike, I bought the plugs, cap, roter, and wires from the dealership. the air
filter was changed 10,000km before.
Is it possible the wires cracked(which I did not check) not insulated, or
the end of the wires not fully pushed into the plugs.
"Mike Romain" <romainm@sympatico.ca> wrote in message
news:42288892.93CC4A86@sympatico.ca...
> How is the air filter? When they get older humidity can affect the air
> flow through the dust.
>
> I don't know what plugs you used, but I have seen a pile of those
> expensive bosch platinum plugs burn out fast in the 4.0 and 4.2
> engines. They last for 6 month or a year, then the engine power up and
> dies. The best is a Champion in my opinion.
>
> Mike
> 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> 88 Cherokee 235 BFG AT's
>
> Herb wrote:
>>
>> I have a 92 cherokee, 4L auto, 320,000km. I can feel it has more horse
>> power
>> in sunny days. In wet days it's lack of power.
>> I changed plugs, ignitions wires, cap and roters 30,000km before.
>> Anything I need to look into?
>>
>> thank you in advance.
>>
>> Herb
Guest
Posts: n/a
Re: Jeep runs better in sunny days
thank you everyone for the input. I don't believe it's my imagination. I
drive it everyday, I know in dry day, it gets more power.
Mike, I bought the plugs, cap, roter, and wires from the dealership. the air
filter was changed 10,000km before.
Is it possible the wires cracked(which I did not check) not insulated, or
the end of the wires not fully pushed into the plugs.
"Mike Romain" <romainm@sympatico.ca> wrote in message
news:42288892.93CC4A86@sympatico.ca...
> How is the air filter? When they get older humidity can affect the air
> flow through the dust.
>
> I don't know what plugs you used, but I have seen a pile of those
> expensive bosch platinum plugs burn out fast in the 4.0 and 4.2
> engines. They last for 6 month or a year, then the engine power up and
> dies. The best is a Champion in my opinion.
>
> Mike
> 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> 88 Cherokee 235 BFG AT's
>
> Herb wrote:
>>
>> I have a 92 cherokee, 4L auto, 320,000km. I can feel it has more horse
>> power
>> in sunny days. In wet days it's lack of power.
>> I changed plugs, ignitions wires, cap and roters 30,000km before.
>> Anything I need to look into?
>>
>> thank you in advance.
>>
>> Herb
drive it everyday, I know in dry day, it gets more power.
Mike, I bought the plugs, cap, roter, and wires from the dealership. the air
filter was changed 10,000km before.
Is it possible the wires cracked(which I did not check) not insulated, or
the end of the wires not fully pushed into the plugs.
"Mike Romain" <romainm@sympatico.ca> wrote in message
news:42288892.93CC4A86@sympatico.ca...
> How is the air filter? When they get older humidity can affect the air
> flow through the dust.
>
> I don't know what plugs you used, but I have seen a pile of those
> expensive bosch platinum plugs burn out fast in the 4.0 and 4.2
> engines. They last for 6 month or a year, then the engine power up and
> dies. The best is a Champion in my opinion.
>
> Mike
> 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> 88 Cherokee 235 BFG AT's
>
> Herb wrote:
>>
>> I have a 92 cherokee, 4L auto, 320,000km. I can feel it has more horse
>> power
>> in sunny days. In wet days it's lack of power.
>> I changed plugs, ignitions wires, cap and roters 30,000km before.
>> Anything I need to look into?
>>
>> thank you in advance.
>>
>> Herb
Guest
Posts: n/a
Re: Jeep runs better in sunny days
thank you everyone for the input. I don't believe it's my imagination. I
drive it everyday, I know in dry day, it gets more power.
Mike, I bought the plugs, cap, roter, and wires from the dealership. the air
filter was changed 10,000km before.
Is it possible the wires cracked(which I did not check) not insulated, or
the end of the wires not fully pushed into the plugs.
"Mike Romain" <romainm@sympatico.ca> wrote in message
news:42288892.93CC4A86@sympatico.ca...
> How is the air filter? When they get older humidity can affect the air
> flow through the dust.
>
> I don't know what plugs you used, but I have seen a pile of those
> expensive bosch platinum plugs burn out fast in the 4.0 and 4.2
> engines. They last for 6 month or a year, then the engine power up and
> dies. The best is a Champion in my opinion.
>
> Mike
> 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> 88 Cherokee 235 BFG AT's
>
> Herb wrote:
>>
>> I have a 92 cherokee, 4L auto, 320,000km. I can feel it has more horse
>> power
>> in sunny days. In wet days it's lack of power.
>> I changed plugs, ignitions wires, cap and roters 30,000km before.
>> Anything I need to look into?
>>
>> thank you in advance.
>>
>> Herb
drive it everyday, I know in dry day, it gets more power.
Mike, I bought the plugs, cap, roter, and wires from the dealership. the air
filter was changed 10,000km before.
Is it possible the wires cracked(which I did not check) not insulated, or
the end of the wires not fully pushed into the plugs.
"Mike Romain" <romainm@sympatico.ca> wrote in message
news:42288892.93CC4A86@sympatico.ca...
> How is the air filter? When they get older humidity can affect the air
> flow through the dust.
>
> I don't know what plugs you used, but I have seen a pile of those
> expensive bosch platinum plugs burn out fast in the 4.0 and 4.2
> engines. They last for 6 month or a year, then the engine power up and
> dies. The best is a Champion in my opinion.
>
> Mike
> 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> 88 Cherokee 235 BFG AT's
>
> Herb wrote:
>>
>> I have a 92 cherokee, 4L auto, 320,000km. I can feel it has more horse
>> power
>> in sunny days. In wet days it's lack of power.
>> I changed plugs, ignitions wires, cap and roters 30,000km before.
>> Anything I need to look into?
>>
>> thank you in advance.
>>
>> Herb
Guest
Posts: n/a
Re: Jeep runs better in sunny days
I find the air filter can be sneaky on 4.0's with high mileage because
the engine sometimes will spit an oil film onto it. Even my CJ's just
messed up catching me by surprise. I went camping a couple weeks back
and used a full tank of gas for 210 miles! 70 freaking liters! I
haven't driven the CJ much in the last year so have very little miles on
that filter, but it was blocked with dust anyway.
It would be worth checking the wires too. They can back off a plug or
work out of the distributor cap sometimes.
Have you changed fuel brands recently? I do find a difference in
performance and mileage between brands.
Mike
Herb wrote:
>
> thank you everyone for the input. I don't believe it's my imagination. I
> drive it everyday, I know in dry day, it gets more power.
>
> Mike, I bought the plugs, cap, roter, and wires from the dealership. the air
> filter was changed 10,000km before.
>
> Is it possible the wires cracked(which I did not check) not insulated, or
> the end of the wires not fully pushed into the plugs.
>
> "Mike Romain" <romainm@sympatico.ca> wrote in message
> news:42288892.93CC4A86@sympatico.ca...
> > How is the air filter? When they get older humidity can affect the air
> > flow through the dust.
> >
> > I don't know what plugs you used, but I have seen a pile of those
> > expensive bosch platinum plugs burn out fast in the 4.0 and 4.2
> > engines. They last for 6 month or a year, then the engine power up and
> > dies. The best is a Champion in my opinion.
> >
> > Mike
> > 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> > 88 Cherokee 235 BFG AT's
> >
> > Herb wrote:
> >>
> >> I have a 92 cherokee, 4L auto, 320,000km. I can feel it has more horse
> >> power
> >> in sunny days. In wet days it's lack of power.
> >> I changed plugs, ignitions wires, cap and roters 30,000km before.
> >> Anything I need to look into?
> >>
> >> thank you in advance.
> >>
> >> Herb
the engine sometimes will spit an oil film onto it. Even my CJ's just
messed up catching me by surprise. I went camping a couple weeks back
and used a full tank of gas for 210 miles! 70 freaking liters! I
haven't driven the CJ much in the last year so have very little miles on
that filter, but it was blocked with dust anyway.
It would be worth checking the wires too. They can back off a plug or
work out of the distributor cap sometimes.
Have you changed fuel brands recently? I do find a difference in
performance and mileage between brands.
Mike
Herb wrote:
>
> thank you everyone for the input. I don't believe it's my imagination. I
> drive it everyday, I know in dry day, it gets more power.
>
> Mike, I bought the plugs, cap, roter, and wires from the dealership. the air
> filter was changed 10,000km before.
>
> Is it possible the wires cracked(which I did not check) not insulated, or
> the end of the wires not fully pushed into the plugs.
>
> "Mike Romain" <romainm@sympatico.ca> wrote in message
> news:42288892.93CC4A86@sympatico.ca...
> > How is the air filter? When they get older humidity can affect the air
> > flow through the dust.
> >
> > I don't know what plugs you used, but I have seen a pile of those
> > expensive bosch platinum plugs burn out fast in the 4.0 and 4.2
> > engines. They last for 6 month or a year, then the engine power up and
> > dies. The best is a Champion in my opinion.
> >
> > Mike
> > 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> > 88 Cherokee 235 BFG AT's
> >
> > Herb wrote:
> >>
> >> I have a 92 cherokee, 4L auto, 320,000km. I can feel it has more horse
> >> power
> >> in sunny days. In wet days it's lack of power.
> >> I changed plugs, ignitions wires, cap and roters 30,000km before.
> >> Anything I need to look into?
> >>
> >> thank you in advance.
> >>
> >> Herb
