No Ported Vacuum
#61
Guest
Posts: n/a
Re: No Ported Vacuum
It is still a mystery. To answer some of the questions raised...It is not a
collapsed hose or a crossed hose since there is no hose, I am checking the
vacuum directly at the port. Also, the idle is all screwed up after I
started messing with the hoses. I will be changing all the vacuum hoses
this weekend and will restore the whole system back to its original
configuration. I will post my results here when I am done. I am confident
that I will pass the emissions portion of the test now that I put in a new
cat in but the functional part will not pass until I am done resorting
everything. I will hopefully get to the test this weekend and will post the
results. Maybe somehow I will have vacuum again after I change all the
hoses and reconnect everything but I doubt it. But we can continue the
guessing game after I post my results this weekend. Thanks again to all of
you for the suggestions.
Steve
"steve" <None@nothing.com> wrote in message
news:41i9f.6192$D13.468@newssvr11.news.prodigy.com ...
> Hi All,
>
> I am not getting any ported vacuum going to my EGR valve. I checked the
> vac at the connection that is on the top of the Carter BBD - the one on
> the engine side of the carb and there is no vacuum at any RPM. Anyone
> have any ideas why?
>
> Thanks in advance,
> Steve
>
collapsed hose or a crossed hose since there is no hose, I am checking the
vacuum directly at the port. Also, the idle is all screwed up after I
started messing with the hoses. I will be changing all the vacuum hoses
this weekend and will restore the whole system back to its original
configuration. I will post my results here when I am done. I am confident
that I will pass the emissions portion of the test now that I put in a new
cat in but the functional part will not pass until I am done resorting
everything. I will hopefully get to the test this weekend and will post the
results. Maybe somehow I will have vacuum again after I change all the
hoses and reconnect everything but I doubt it. But we can continue the
guessing game after I post my results this weekend. Thanks again to all of
you for the suggestions.
Steve
"steve" <None@nothing.com> wrote in message
news:41i9f.6192$D13.468@newssvr11.news.prodigy.com ...
> Hi All,
>
> I am not getting any ported vacuum going to my EGR valve. I checked the
> vac at the connection that is on the top of the Carter BBD - the one on
> the engine side of the carb and there is no vacuum at any RPM. Anyone
> have any ideas why?
>
> Thanks in advance,
> Steve
>
#62
Guest
Posts: n/a
Re: No Ported Vacuum
I'll bet the port is blocked. Most likely gasket 61 is missing a hole, or is
wrong and blocking the passage. Or, is wrong and is bleeding off the vacuum.
Take a piece of vacuum hose, connect one end to the ported vacuum nipple, and
blow in the other end. I'll bet you can't blow through it. If you can blow
through it , you need to find where the air is escaping.
There is a nipple on the base, next to the left idle mixture screw, just above
screw 59. It's usually capped from the factory. That is also ported, but is
calibrated differently than the one on the side. That may cause hesitation, or
not enough EGR.
Note in that picture that gasket 61 is not facing the same direction the carb
is. It's backwards. Maybe somebody actually managed to put yours together like
that. :-)
Also note that venturi vacuum has been mentioned in this thread. Ported vacuum
is not the same as venturi vacuum. Venturi vacuum is much lower than ported,
and would not be enough to actuate the EGR valve. Your carb has no nipples for
venturi vacuum.
In message <1XX9f.8834$7h7.4837@newssvr21.news.prodigy.com> , "steve" wrote:
>The Jeep is an '88 YJ that has been tagged as a "Tampered/gross-polluter"
>after three failed California smog inspections. Even if I could pass
>without the EGR valve, I would still like to understand why I have no ported
>vacuum. The port I am referring to is the one just above part #60 in the
>diagram at this link... http://www.carburetorfactory.com/expvw03.html. I
>have sprayed cleaner in it and it is not blocked. Even if I rev the engine
>to 2500rpm, there is zero vacuum. I am checking it directly at the port not
>at the EGR end so there are no leaky hoses or valves getting in the way.
>What am I missing here? Is there another port that provides ported vacuum?
>
>Thanks again,
>Steve
>"steve" <None@nothing.com> wrote in message
>news:41i9f.6192$D13.468@newssvr11.news.prodigy.co m...
>> Hi All,
>>
>> I am not getting any ported vacuum going to my EGR valve. I checked the
>> vac at the connection that is on the top of the Carter BBD - the one on
>> the engine side of the carb and there is no vacuum at any RPM. Anyone
>> have any ideas why?
>>
>> Thanks in advance,
>> Steve
>>
>
wrong and blocking the passage. Or, is wrong and is bleeding off the vacuum.
Take a piece of vacuum hose, connect one end to the ported vacuum nipple, and
blow in the other end. I'll bet you can't blow through it. If you can blow
through it , you need to find where the air is escaping.
There is a nipple on the base, next to the left idle mixture screw, just above
screw 59. It's usually capped from the factory. That is also ported, but is
calibrated differently than the one on the side. That may cause hesitation, or
not enough EGR.
Note in that picture that gasket 61 is not facing the same direction the carb
is. It's backwards. Maybe somebody actually managed to put yours together like
that. :-)
Also note that venturi vacuum has been mentioned in this thread. Ported vacuum
is not the same as venturi vacuum. Venturi vacuum is much lower than ported,
and would not be enough to actuate the EGR valve. Your carb has no nipples for
venturi vacuum.
In message <1XX9f.8834$7h7.4837@newssvr21.news.prodigy.com> , "steve" wrote:
>The Jeep is an '88 YJ that has been tagged as a "Tampered/gross-polluter"
>after three failed California smog inspections. Even if I could pass
>without the EGR valve, I would still like to understand why I have no ported
>vacuum. The port I am referring to is the one just above part #60 in the
>diagram at this link... http://www.carburetorfactory.com/expvw03.html. I
>have sprayed cleaner in it and it is not blocked. Even if I rev the engine
>to 2500rpm, there is zero vacuum. I am checking it directly at the port not
>at the EGR end so there are no leaky hoses or valves getting in the way.
>What am I missing here? Is there another port that provides ported vacuum?
>
>Thanks again,
>Steve
>"steve" <None@nothing.com> wrote in message
>news:41i9f.6192$D13.468@newssvr11.news.prodigy.co m...
>> Hi All,
>>
>> I am not getting any ported vacuum going to my EGR valve. I checked the
>> vac at the connection that is on the top of the Carter BBD - the one on
>> the engine side of the carb and there is no vacuum at any RPM. Anyone
>> have any ideas why?
>>
>> Thanks in advance,
>> Steve
>>
>
#63
Guest
Posts: n/a
Re: No Ported Vacuum
I'll bet the port is blocked. Most likely gasket 61 is missing a hole, or is
wrong and blocking the passage. Or, is wrong and is bleeding off the vacuum.
Take a piece of vacuum hose, connect one end to the ported vacuum nipple, and
blow in the other end. I'll bet you can't blow through it. If you can blow
through it , you need to find where the air is escaping.
There is a nipple on the base, next to the left idle mixture screw, just above
screw 59. It's usually capped from the factory. That is also ported, but is
calibrated differently than the one on the side. That may cause hesitation, or
not enough EGR.
Note in that picture that gasket 61 is not facing the same direction the carb
is. It's backwards. Maybe somebody actually managed to put yours together like
that. :-)
Also note that venturi vacuum has been mentioned in this thread. Ported vacuum
is not the same as venturi vacuum. Venturi vacuum is much lower than ported,
and would not be enough to actuate the EGR valve. Your carb has no nipples for
venturi vacuum.
In message <1XX9f.8834$7h7.4837@newssvr21.news.prodigy.com> , "steve" wrote:
>The Jeep is an '88 YJ that has been tagged as a "Tampered/gross-polluter"
>after three failed California smog inspections. Even if I could pass
>without the EGR valve, I would still like to understand why I have no ported
>vacuum. The port I am referring to is the one just above part #60 in the
>diagram at this link... http://www.carburetorfactory.com/expvw03.html. I
>have sprayed cleaner in it and it is not blocked. Even if I rev the engine
>to 2500rpm, there is zero vacuum. I am checking it directly at the port not
>at the EGR end so there are no leaky hoses or valves getting in the way.
>What am I missing here? Is there another port that provides ported vacuum?
>
>Thanks again,
>Steve
>"steve" <None@nothing.com> wrote in message
>news:41i9f.6192$D13.468@newssvr11.news.prodigy.co m...
>> Hi All,
>>
>> I am not getting any ported vacuum going to my EGR valve. I checked the
>> vac at the connection that is on the top of the Carter BBD - the one on
>> the engine side of the carb and there is no vacuum at any RPM. Anyone
>> have any ideas why?
>>
>> Thanks in advance,
>> Steve
>>
>
wrong and blocking the passage. Or, is wrong and is bleeding off the vacuum.
Take a piece of vacuum hose, connect one end to the ported vacuum nipple, and
blow in the other end. I'll bet you can't blow through it. If you can blow
through it , you need to find where the air is escaping.
There is a nipple on the base, next to the left idle mixture screw, just above
screw 59. It's usually capped from the factory. That is also ported, but is
calibrated differently than the one on the side. That may cause hesitation, or
not enough EGR.
Note in that picture that gasket 61 is not facing the same direction the carb
is. It's backwards. Maybe somebody actually managed to put yours together like
that. :-)
Also note that venturi vacuum has been mentioned in this thread. Ported vacuum
is not the same as venturi vacuum. Venturi vacuum is much lower than ported,
and would not be enough to actuate the EGR valve. Your carb has no nipples for
venturi vacuum.
In message <1XX9f.8834$7h7.4837@newssvr21.news.prodigy.com> , "steve" wrote:
>The Jeep is an '88 YJ that has been tagged as a "Tampered/gross-polluter"
>after three failed California smog inspections. Even if I could pass
>without the EGR valve, I would still like to understand why I have no ported
>vacuum. The port I am referring to is the one just above part #60 in the
>diagram at this link... http://www.carburetorfactory.com/expvw03.html. I
>have sprayed cleaner in it and it is not blocked. Even if I rev the engine
>to 2500rpm, there is zero vacuum. I am checking it directly at the port not
>at the EGR end so there are no leaky hoses or valves getting in the way.
>What am I missing here? Is there another port that provides ported vacuum?
>
>Thanks again,
>Steve
>"steve" <None@nothing.com> wrote in message
>news:41i9f.6192$D13.468@newssvr11.news.prodigy.co m...
>> Hi All,
>>
>> I am not getting any ported vacuum going to my EGR valve. I checked the
>> vac at the connection that is on the top of the Carter BBD - the one on
>> the engine side of the carb and there is no vacuum at any RPM. Anyone
>> have any ideas why?
>>
>> Thanks in advance,
>> Steve
>>
>
#64
Guest
Posts: n/a
Re: No Ported Vacuum
I'll bet the port is blocked. Most likely gasket 61 is missing a hole, or is
wrong and blocking the passage. Or, is wrong and is bleeding off the vacuum.
Take a piece of vacuum hose, connect one end to the ported vacuum nipple, and
blow in the other end. I'll bet you can't blow through it. If you can blow
through it , you need to find where the air is escaping.
There is a nipple on the base, next to the left idle mixture screw, just above
screw 59. It's usually capped from the factory. That is also ported, but is
calibrated differently than the one on the side. That may cause hesitation, or
not enough EGR.
Note in that picture that gasket 61 is not facing the same direction the carb
is. It's backwards. Maybe somebody actually managed to put yours together like
that. :-)
Also note that venturi vacuum has been mentioned in this thread. Ported vacuum
is not the same as venturi vacuum. Venturi vacuum is much lower than ported,
and would not be enough to actuate the EGR valve. Your carb has no nipples for
venturi vacuum.
In message <1XX9f.8834$7h7.4837@newssvr21.news.prodigy.com> , "steve" wrote:
>The Jeep is an '88 YJ that has been tagged as a "Tampered/gross-polluter"
>after three failed California smog inspections. Even if I could pass
>without the EGR valve, I would still like to understand why I have no ported
>vacuum. The port I am referring to is the one just above part #60 in the
>diagram at this link... http://www.carburetorfactory.com/expvw03.html. I
>have sprayed cleaner in it and it is not blocked. Even if I rev the engine
>to 2500rpm, there is zero vacuum. I am checking it directly at the port not
>at the EGR end so there are no leaky hoses or valves getting in the way.
>What am I missing here? Is there another port that provides ported vacuum?
>
>Thanks again,
>Steve
>"steve" <None@nothing.com> wrote in message
>news:41i9f.6192$D13.468@newssvr11.news.prodigy.co m...
>> Hi All,
>>
>> I am not getting any ported vacuum going to my EGR valve. I checked the
>> vac at the connection that is on the top of the Carter BBD - the one on
>> the engine side of the carb and there is no vacuum at any RPM. Anyone
>> have any ideas why?
>>
>> Thanks in advance,
>> Steve
>>
>
wrong and blocking the passage. Or, is wrong and is bleeding off the vacuum.
Take a piece of vacuum hose, connect one end to the ported vacuum nipple, and
blow in the other end. I'll bet you can't blow through it. If you can blow
through it , you need to find where the air is escaping.
There is a nipple on the base, next to the left idle mixture screw, just above
screw 59. It's usually capped from the factory. That is also ported, but is
calibrated differently than the one on the side. That may cause hesitation, or
not enough EGR.
Note in that picture that gasket 61 is not facing the same direction the carb
is. It's backwards. Maybe somebody actually managed to put yours together like
that. :-)
Also note that venturi vacuum has been mentioned in this thread. Ported vacuum
is not the same as venturi vacuum. Venturi vacuum is much lower than ported,
and would not be enough to actuate the EGR valve. Your carb has no nipples for
venturi vacuum.
In message <1XX9f.8834$7h7.4837@newssvr21.news.prodigy.com> , "steve" wrote:
>The Jeep is an '88 YJ that has been tagged as a "Tampered/gross-polluter"
>after three failed California smog inspections. Even if I could pass
>without the EGR valve, I would still like to understand why I have no ported
>vacuum. The port I am referring to is the one just above part #60 in the
>diagram at this link... http://www.carburetorfactory.com/expvw03.html. I
>have sprayed cleaner in it and it is not blocked. Even if I rev the engine
>to 2500rpm, there is zero vacuum. I am checking it directly at the port not
>at the EGR end so there are no leaky hoses or valves getting in the way.
>What am I missing here? Is there another port that provides ported vacuum?
>
>Thanks again,
>Steve
>"steve" <None@nothing.com> wrote in message
>news:41i9f.6192$D13.468@newssvr11.news.prodigy.co m...
>> Hi All,
>>
>> I am not getting any ported vacuum going to my EGR valve. I checked the
>> vac at the connection that is on the top of the Carter BBD - the one on
>> the engine side of the carb and there is no vacuum at any RPM. Anyone
>> have any ideas why?
>>
>> Thanks in advance,
>> Steve
>>
>
#65
Guest
Posts: n/a
Re: No Ported Vacuum
--------,
This would be the Venturi port any of the thousands of carburetors
I've rebuilt: http://www.----------.com/temp/BDDventuriPort.jpg This is
the location Steve, the Original Poster describes: "The port I am
referring to is the one just above part #60 in the diagram at this
link... http://www.carburetorfactory.com/expvw03.html." Which of course
wouldn't used to work the Exhaust Gases Recycling diaphragm, but to
trigger the valve to it, if it was a Ford:
http://www.----------.com/decelValve.jpg
God Bless America, Bill O|||||||O
mailto:--------------------
bllsht wrote:
><snip>
>
> Also note that venturi vacuum has been mentioned in this thread. Ported vacuum
> is not the same as venturi vacuum. Venturi vacuum is much lower than ported,
> and would not be enough to actuate the EGR valve. Your carb has no nipples for
> venturi vacuum.
This would be the Venturi port any of the thousands of carburetors
I've rebuilt: http://www.----------.com/temp/BDDventuriPort.jpg This is
the location Steve, the Original Poster describes: "The port I am
referring to is the one just above part #60 in the diagram at this
link... http://www.carburetorfactory.com/expvw03.html." Which of course
wouldn't used to work the Exhaust Gases Recycling diaphragm, but to
trigger the valve to it, if it was a Ford:
http://www.----------.com/decelValve.jpg
God Bless America, Bill O|||||||O
mailto:--------------------
bllsht wrote:
><snip>
>
> Also note that venturi vacuum has been mentioned in this thread. Ported vacuum
> is not the same as venturi vacuum. Venturi vacuum is much lower than ported,
> and would not be enough to actuate the EGR valve. Your carb has no nipples for
> venturi vacuum.
#66
Guest
Posts: n/a
Re: No Ported Vacuum
--------,
This would be the Venturi port any of the thousands of carburetors
I've rebuilt: http://www.----------.com/temp/BDDventuriPort.jpg This is
the location Steve, the Original Poster describes: "The port I am
referring to is the one just above part #60 in the diagram at this
link... http://www.carburetorfactory.com/expvw03.html." Which of course
wouldn't used to work the Exhaust Gases Recycling diaphragm, but to
trigger the valve to it, if it was a Ford:
http://www.----------.com/decelValve.jpg
God Bless America, Bill O|||||||O
mailto:--------------------
bllsht wrote:
><snip>
>
> Also note that venturi vacuum has been mentioned in this thread. Ported vacuum
> is not the same as venturi vacuum. Venturi vacuum is much lower than ported,
> and would not be enough to actuate the EGR valve. Your carb has no nipples for
> venturi vacuum.
This would be the Venturi port any of the thousands of carburetors
I've rebuilt: http://www.----------.com/temp/BDDventuriPort.jpg This is
the location Steve, the Original Poster describes: "The port I am
referring to is the one just above part #60 in the diagram at this
link... http://www.carburetorfactory.com/expvw03.html." Which of course
wouldn't used to work the Exhaust Gases Recycling diaphragm, but to
trigger the valve to it, if it was a Ford:
http://www.----------.com/decelValve.jpg
God Bless America, Bill O|||||||O
mailto:--------------------
bllsht wrote:
><snip>
>
> Also note that venturi vacuum has been mentioned in this thread. Ported vacuum
> is not the same as venturi vacuum. Venturi vacuum is much lower than ported,
> and would not be enough to actuate the EGR valve. Your carb has no nipples for
> venturi vacuum.
#67
Guest
Posts: n/a
Re: No Ported Vacuum
--------,
This would be the Venturi port any of the thousands of carburetors
I've rebuilt: http://www.----------.com/temp/BDDventuriPort.jpg This is
the location Steve, the Original Poster describes: "The port I am
referring to is the one just above part #60 in the diagram at this
link... http://www.carburetorfactory.com/expvw03.html." Which of course
wouldn't used to work the Exhaust Gases Recycling diaphragm, but to
trigger the valve to it, if it was a Ford:
http://www.----------.com/decelValve.jpg
God Bless America, Bill O|||||||O
mailto:--------------------
bllsht wrote:
><snip>
>
> Also note that venturi vacuum has been mentioned in this thread. Ported vacuum
> is not the same as venturi vacuum. Venturi vacuum is much lower than ported,
> and would not be enough to actuate the EGR valve. Your carb has no nipples for
> venturi vacuum.
This would be the Venturi port any of the thousands of carburetors
I've rebuilt: http://www.----------.com/temp/BDDventuriPort.jpg This is
the location Steve, the Original Poster describes: "The port I am
referring to is the one just above part #60 in the diagram at this
link... http://www.carburetorfactory.com/expvw03.html." Which of course
wouldn't used to work the Exhaust Gases Recycling diaphragm, but to
trigger the valve to it, if it was a Ford:
http://www.----------.com/decelValve.jpg
God Bless America, Bill O|||||||O
mailto:--------------------
bllsht wrote:
><snip>
>
> Also note that venturi vacuum has been mentioned in this thread. Ported vacuum
> is not the same as venturi vacuum. Venturi vacuum is much lower than ported,
> and would not be enough to actuate the EGR valve. Your carb has no nipples for
> venturi vacuum.
#68
Guest
Posts: n/a
Re: No Ported Vacuum
In message <4369B3C3.AAC65FE1@***.net>, "L.W." wrote:
>--------,
> This would be the Venturi port any of the thousands of carburetors
>I've rebuilt: http://www.----------.com/temp/BDDventuriPort.jpg This is
>the location Steve, the Original Poster describes: "The port I am
>referring to is the one just above part #60 in the diagram at this
>link... http://www.carburetorfactory.com/expvw03.html."
The port above #60 is a ported vacuum port. Not venturi vacuum. That port
originates in the carb base, just above the throttle plate, in the throttle
bore. There is no external port supplying venturi vacuum on a BBD carb.
The port Steve refers to is pointing to the right in this photo:
http://www.geocities.com/mrbbd1/bt.jpg
A closer look at your picture makes me think that may be venturi vacuum on that
carb. That's a very old picture, however. The electronic BBDs with stepper
motors used on Jeeps, which I assume Steve has, definitely had ported vacuum
there.
Ford did use venturi vacuum to control EGR via a vacuum amplifier on some models
in the 70s as I recall.
Venturi vacuum comes from the venturi in the carb. Ported vacuum comes from
just above the throttle plate.
> Which of course
>wouldn't used to work the Exhaust Gases Recycling diaphragm, but to
>trigger the valve to it, if it was a Ford:
>http://www.----------.com/decelValve.jpg
The port Steve is referring to is the port that supplies vacuum to the EGR valve
through a CTO valve. The CTO only prevents vacuum from being routed to the EGR
valve until the engine is warm. The Jeep system doesn't use anything like the
valve in your picture, nor does it need one, as it doesn't use venturi vacuum to
control EGR.
> God Bless America, Bill O|||||||O
>mailto:--------------------
>
>bllsht wrote:
>><snip>
>>
>> Also note that venturi vacuum has been mentioned in this thread. Ported vacuum
>> is not the same as venturi vacuum. Venturi vacuum is much lower than ported,
>> and would not be enough to actuate the EGR valve. Your carb has no nipples for
>> venturi vacuum.
>--------,
> This would be the Venturi port any of the thousands of carburetors
>I've rebuilt: http://www.----------.com/temp/BDDventuriPort.jpg This is
>the location Steve, the Original Poster describes: "The port I am
>referring to is the one just above part #60 in the diagram at this
>link... http://www.carburetorfactory.com/expvw03.html."
The port above #60 is a ported vacuum port. Not venturi vacuum. That port
originates in the carb base, just above the throttle plate, in the throttle
bore. There is no external port supplying venturi vacuum on a BBD carb.
The port Steve refers to is pointing to the right in this photo:
http://www.geocities.com/mrbbd1/bt.jpg
A closer look at your picture makes me think that may be venturi vacuum on that
carb. That's a very old picture, however. The electronic BBDs with stepper
motors used on Jeeps, which I assume Steve has, definitely had ported vacuum
there.
Ford did use venturi vacuum to control EGR via a vacuum amplifier on some models
in the 70s as I recall.
Venturi vacuum comes from the venturi in the carb. Ported vacuum comes from
just above the throttle plate.
> Which of course
>wouldn't used to work the Exhaust Gases Recycling diaphragm, but to
>trigger the valve to it, if it was a Ford:
>http://www.----------.com/decelValve.jpg
The port Steve is referring to is the port that supplies vacuum to the EGR valve
through a CTO valve. The CTO only prevents vacuum from being routed to the EGR
valve until the engine is warm. The Jeep system doesn't use anything like the
valve in your picture, nor does it need one, as it doesn't use venturi vacuum to
control EGR.
> God Bless America, Bill O|||||||O
>mailto:--------------------
>
>bllsht wrote:
>><snip>
>>
>> Also note that venturi vacuum has been mentioned in this thread. Ported vacuum
>> is not the same as venturi vacuum. Venturi vacuum is much lower than ported,
>> and would not be enough to actuate the EGR valve. Your carb has no nipples for
>> venturi vacuum.
#69
Guest
Posts: n/a
Re: No Ported Vacuum
In message <4369B3C3.AAC65FE1@***.net>, "L.W." wrote:
>--------,
> This would be the Venturi port any of the thousands of carburetors
>I've rebuilt: http://www.----------.com/temp/BDDventuriPort.jpg This is
>the location Steve, the Original Poster describes: "The port I am
>referring to is the one just above part #60 in the diagram at this
>link... http://www.carburetorfactory.com/expvw03.html."
The port above #60 is a ported vacuum port. Not venturi vacuum. That port
originates in the carb base, just above the throttle plate, in the throttle
bore. There is no external port supplying venturi vacuum on a BBD carb.
The port Steve refers to is pointing to the right in this photo:
http://www.geocities.com/mrbbd1/bt.jpg
A closer look at your picture makes me think that may be venturi vacuum on that
carb. That's a very old picture, however. The electronic BBDs with stepper
motors used on Jeeps, which I assume Steve has, definitely had ported vacuum
there.
Ford did use venturi vacuum to control EGR via a vacuum amplifier on some models
in the 70s as I recall.
Venturi vacuum comes from the venturi in the carb. Ported vacuum comes from
just above the throttle plate.
> Which of course
>wouldn't used to work the Exhaust Gases Recycling diaphragm, but to
>trigger the valve to it, if it was a Ford:
>http://www.----------.com/decelValve.jpg
The port Steve is referring to is the port that supplies vacuum to the EGR valve
through a CTO valve. The CTO only prevents vacuum from being routed to the EGR
valve until the engine is warm. The Jeep system doesn't use anything like the
valve in your picture, nor does it need one, as it doesn't use venturi vacuum to
control EGR.
> God Bless America, Bill O|||||||O
>mailto:--------------------
>
>bllsht wrote:
>><snip>
>>
>> Also note that venturi vacuum has been mentioned in this thread. Ported vacuum
>> is not the same as venturi vacuum. Venturi vacuum is much lower than ported,
>> and would not be enough to actuate the EGR valve. Your carb has no nipples for
>> venturi vacuum.
>--------,
> This would be the Venturi port any of the thousands of carburetors
>I've rebuilt: http://www.----------.com/temp/BDDventuriPort.jpg This is
>the location Steve, the Original Poster describes: "The port I am
>referring to is the one just above part #60 in the diagram at this
>link... http://www.carburetorfactory.com/expvw03.html."
The port above #60 is a ported vacuum port. Not venturi vacuum. That port
originates in the carb base, just above the throttle plate, in the throttle
bore. There is no external port supplying venturi vacuum on a BBD carb.
The port Steve refers to is pointing to the right in this photo:
http://www.geocities.com/mrbbd1/bt.jpg
A closer look at your picture makes me think that may be venturi vacuum on that
carb. That's a very old picture, however. The electronic BBDs with stepper
motors used on Jeeps, which I assume Steve has, definitely had ported vacuum
there.
Ford did use venturi vacuum to control EGR via a vacuum amplifier on some models
in the 70s as I recall.
Venturi vacuum comes from the venturi in the carb. Ported vacuum comes from
just above the throttle plate.
> Which of course
>wouldn't used to work the Exhaust Gases Recycling diaphragm, but to
>trigger the valve to it, if it was a Ford:
>http://www.----------.com/decelValve.jpg
The port Steve is referring to is the port that supplies vacuum to the EGR valve
through a CTO valve. The CTO only prevents vacuum from being routed to the EGR
valve until the engine is warm. The Jeep system doesn't use anything like the
valve in your picture, nor does it need one, as it doesn't use venturi vacuum to
control EGR.
> God Bless America, Bill O|||||||O
>mailto:--------------------
>
>bllsht wrote:
>><snip>
>>
>> Also note that venturi vacuum has been mentioned in this thread. Ported vacuum
>> is not the same as venturi vacuum. Venturi vacuum is much lower than ported,
>> and would not be enough to actuate the EGR valve. Your carb has no nipples for
>> venturi vacuum.
#70
Guest
Posts: n/a
Re: No Ported Vacuum
In message <4369B3C3.AAC65FE1@***.net>, "L.W." wrote:
>--------,
> This would be the Venturi port any of the thousands of carburetors
>I've rebuilt: http://www.----------.com/temp/BDDventuriPort.jpg This is
>the location Steve, the Original Poster describes: "The port I am
>referring to is the one just above part #60 in the diagram at this
>link... http://www.carburetorfactory.com/expvw03.html."
The port above #60 is a ported vacuum port. Not venturi vacuum. That port
originates in the carb base, just above the throttle plate, in the throttle
bore. There is no external port supplying venturi vacuum on a BBD carb.
The port Steve refers to is pointing to the right in this photo:
http://www.geocities.com/mrbbd1/bt.jpg
A closer look at your picture makes me think that may be venturi vacuum on that
carb. That's a very old picture, however. The electronic BBDs with stepper
motors used on Jeeps, which I assume Steve has, definitely had ported vacuum
there.
Ford did use venturi vacuum to control EGR via a vacuum amplifier on some models
in the 70s as I recall.
Venturi vacuum comes from the venturi in the carb. Ported vacuum comes from
just above the throttle plate.
> Which of course
>wouldn't used to work the Exhaust Gases Recycling diaphragm, but to
>trigger the valve to it, if it was a Ford:
>http://www.----------.com/decelValve.jpg
The port Steve is referring to is the port that supplies vacuum to the EGR valve
through a CTO valve. The CTO only prevents vacuum from being routed to the EGR
valve until the engine is warm. The Jeep system doesn't use anything like the
valve in your picture, nor does it need one, as it doesn't use venturi vacuum to
control EGR.
> God Bless America, Bill O|||||||O
>mailto:--------------------
>
>bllsht wrote:
>><snip>
>>
>> Also note that venturi vacuum has been mentioned in this thread. Ported vacuum
>> is not the same as venturi vacuum. Venturi vacuum is much lower than ported,
>> and would not be enough to actuate the EGR valve. Your carb has no nipples for
>> venturi vacuum.
>--------,
> This would be the Venturi port any of the thousands of carburetors
>I've rebuilt: http://www.----------.com/temp/BDDventuriPort.jpg This is
>the location Steve, the Original Poster describes: "The port I am
>referring to is the one just above part #60 in the diagram at this
>link... http://www.carburetorfactory.com/expvw03.html."
The port above #60 is a ported vacuum port. Not venturi vacuum. That port
originates in the carb base, just above the throttle plate, in the throttle
bore. There is no external port supplying venturi vacuum on a BBD carb.
The port Steve refers to is pointing to the right in this photo:
http://www.geocities.com/mrbbd1/bt.jpg
A closer look at your picture makes me think that may be venturi vacuum on that
carb. That's a very old picture, however. The electronic BBDs with stepper
motors used on Jeeps, which I assume Steve has, definitely had ported vacuum
there.
Ford did use venturi vacuum to control EGR via a vacuum amplifier on some models
in the 70s as I recall.
Venturi vacuum comes from the venturi in the carb. Ported vacuum comes from
just above the throttle plate.
> Which of course
>wouldn't used to work the Exhaust Gases Recycling diaphragm, but to
>trigger the valve to it, if it was a Ford:
>http://www.----------.com/decelValve.jpg
The port Steve is referring to is the port that supplies vacuum to the EGR valve
through a CTO valve. The CTO only prevents vacuum from being routed to the EGR
valve until the engine is warm. The Jeep system doesn't use anything like the
valve in your picture, nor does it need one, as it doesn't use venturi vacuum to
control EGR.
> God Bless America, Bill O|||||||O
>mailto:--------------------
>
>bllsht wrote:
>><snip>
>>
>> Also note that venturi vacuum has been mentioned in this thread. Ported vacuum
>> is not the same as venturi vacuum. Venturi vacuum is much lower than ported,
>> and would not be enough to actuate the EGR valve. Your carb has no nipples for
>> venturi vacuum.