Shaggie

On 21 Jun 2004 10:55:57 -0700, gfzalar@hotmail.com (GaryZ) wrote:

>My '78 cj5 258 has not had a functioning EGR valve since I've owned
>the vehicle. Every year I am replacing the vacuum lines and plugs on
>the carb because they get brittle and crack, which ends up with
>backfires, rough idles ect... I was told that because the EGR is not
>hooked up, the combustion temps are very high, which makes the exhaust
>manifold excessively hot. The excessive heat is drying out the lines
>and plugs. Sounds feasable, from what I've read the EGR is supposed
>to bring down the combustion temps. I can put a new EGR on simple
>enough. I do not have to meet any emissions requirements anymore
>because the jeep is 25+ years old. Is this something I should do, or
>will it not make a difference? If I do put a new one on will I have
>to have the carburetor re-adjusted?

In my day, we didn't have no *FANCY* _E_ _G_ _R_... By cracky, we
didn't even have no *FANCY* cat-a-lytic converters or _mufflers_. We
dumped raw, unmuffled exhaust gasses into the air and breathed deeply
of them in-between puffs off of unfiltered Lucky Strike cigarettes and
shots of corn whiskey chased with tequilla and WE LIKED IT! Our
engines sucked in air and fossil fuel and BURNED it and spat out nasty
by-products and we absolutely LOVED it. :-D

--

Less drivel, more Dremel.
Always carry a flagon of whiskey in case of snakebite,
and furthermore always carry a small snake.
- W.C. Fields

Paul Calman

EGR Theory. , mostly cut and pasted from sources like GM, Niehoff, etc.
EGR serves one purpose and one purpose only. That purpose is to reduce
Oxides of Nitrogen (NOx). Undernormal combustion, Nitrogen(N2)Oxygen (O2)
in the air and Hydrocarbons (HC) in the fuel combind into water(H2O) Carbon
dioxide (CO2) and the Nitrogen remains unchanged. Under very hot combustion
temperatures, the Nitrogen reacts with the other two byproducts and forms
Nitrogen oxide (NO). After being released into the atmosphere, it picks up
another Oxygen and becomes Nitrogen dioxide (NO2). In the presence of
sunlight, it combines with other compounds like Hydrocarbons and forms Smog.
Since exhaust gas is inert (very stable) it doesn't burn again. So by being
introduced into the combustion chamber, it will lower combustion chamber
temps enough so that the Nitrogen doesn't react with the other compounds and
is passed unchanged out the tailpipe thus not contributing to smog.

Since exhaust gas doesn't burn, it doesn't exactly help with combustion. It
does, however, prevent pinging at cruise or light throttle acceleration. If
It pings under these conditions, but not under hard acceleration, hook it
back up.

--
Paul Calman, Hathaway Pines, California

Paul Calman

EGR Theory. , mostly cut and pasted from sources like GM, Niehoff, etc.
EGR serves one purpose and one purpose only. That purpose is to reduce
Oxides of Nitrogen (NOx). Undernormal combustion, Nitrogen(N2)Oxygen (O2)
in the air and Hydrocarbons (HC) in the fuel combind into water(H2O) Carbon
dioxide (CO2) and the Nitrogen remains unchanged. Under very hot combustion
temperatures, the Nitrogen reacts with the other two byproducts and forms
Nitrogen oxide (NO). After being released into the atmosphere, it picks up
another Oxygen and becomes Nitrogen dioxide (NO2). In the presence of
sunlight, it combines with other compounds like Hydrocarbons and forms Smog.
Since exhaust gas is inert (very stable) it doesn't burn again. So by being
introduced into the combustion chamber, it will lower combustion chamber
temps enough so that the Nitrogen doesn't react with the other compounds and
is passed unchanged out the tailpipe thus not contributing to smog.

Since exhaust gas doesn't burn, it doesn't exactly help with combustion. It
does, however, prevent pinging at cruise or light throttle acceleration. If
It pings under these conditions, but not under hard acceleration, hook it
back up.

--
Paul Calman, Hathaway Pines, California

Paul Calman

EGR Theory. , mostly cut and pasted from sources like GM, Niehoff, etc.
EGR serves one purpose and one purpose only. That purpose is to reduce
Oxides of Nitrogen (NOx). Undernormal combustion, Nitrogen(N2)Oxygen (O2)
in the air and Hydrocarbons (HC) in the fuel combind into water(H2O) Carbon
dioxide (CO2) and the Nitrogen remains unchanged. Under very hot combustion
temperatures, the Nitrogen reacts with the other two byproducts and forms
Nitrogen oxide (NO). After being released into the atmosphere, it picks up
another Oxygen and becomes Nitrogen dioxide (NO2). In the presence of
sunlight, it combines with other compounds like Hydrocarbons and forms Smog.
Since exhaust gas is inert (very stable) it doesn't burn again. So by being
introduced into the combustion chamber, it will lower combustion chamber
temps enough so that the Nitrogen doesn't react with the other compounds and
is passed unchanged out the tailpipe thus not contributing to smog.

Since exhaust gas doesn't burn, it doesn't exactly help with combustion. It
does, however, prevent pinging at cruise or light throttle acceleration. If
It pings under these conditions, but not under hard acceleration, hook it
back up.

--
Paul Calman, Hathaway Pines, California

Paul Calman

EGR Theory. , mostly cut and pasted from sources like GM, Niehoff, etc.
EGR serves one purpose and one purpose only. That purpose is to reduce
Oxides of Nitrogen (NOx). Undernormal combustion, Nitrogen(N2)Oxygen (O2)
in the air and Hydrocarbons (HC) in the fuel combind into water(H2O) Carbon
dioxide (CO2) and the Nitrogen remains unchanged. Under very hot combustion
temperatures, the Nitrogen reacts with the other two byproducts and forms
Nitrogen oxide (NO). After being released into the atmosphere, it picks up
another Oxygen and becomes Nitrogen dioxide (NO2). In the presence of
sunlight, it combines with other compounds like Hydrocarbons and forms Smog.
Since exhaust gas is inert (very stable) it doesn't burn again. So by being
introduced into the combustion chamber, it will lower combustion chamber
temps enough so that the Nitrogen doesn't react with the other compounds and
is passed unchanged out the tailpipe thus not contributing to smog.

Since exhaust gas doesn't burn, it doesn't exactly help with combustion. It
does, however, prevent pinging at cruise or light throttle acceleration. If
It pings under these conditions, but not under hard acceleration, hook it
back up.

--
Paul Calman, Hathaway Pines, California

L.W.(=?iso-8859-1?Q?=DFill?=) Hughes III

Paul, the only time the Exhaust Gases Recirculation valve opens is on
hard deceleration. All that could do not allow air and mixture to be
suck through the carburetor during deceleration:
http://www.----------.com/72CJsmog.jpg
God Bless America, ßill O|||||||O
mailto:--------------------

Paul Calman wrote:
>
> EGR Theory. , mostly cut and pasted from sources like GM, Niehoff, etc.
> EGR serves one purpose and one purpose only. That purpose is to reduce
> Oxides of Nitrogen (NOx). Undernormal combustion, Nitrogen(N2)Oxygen (O2)
> in the air and Hydrocarbons (HC) in the fuel combind into water(H2O) Carbon
> dioxide (CO2) and the Nitrogen remains unchanged. Under very hot combustion
> temperatures, the Nitrogen reacts with the other two byproducts and forms
> Nitrogen oxide (NO). After being released into the atmosphere, it picks up
> another Oxygen and becomes Nitrogen dioxide (NO2). In the presence of
> sunlight, it combines with other compounds like Hydrocarbons and forms Smog.
> Since exhaust gas is inert (very stable) it doesn't burn again. So by being
> introduced into the combustion chamber, it will lower combustion chamber
> temps enough so that the Nitrogen doesn't react with the other compounds and
> is passed unchanged out the tailpipe thus not contributing to smog.
>
> Since exhaust gas doesn't burn, it doesn't exactly help with combustion. It
> does, however, prevent pinging at cruise or light throttle acceleration. If
> It pings under these conditions, but not under hard acceleration, hook it
> back up.
>
> --
> Paul Calman, Hathaway Pines, California

L.W.(=?iso-8859-1?Q?=DFill?=) Hughes III

Paul, the only time the Exhaust Gases Recirculation valve opens is on
hard deceleration. All that could do not allow air and mixture to be
suck through the carburetor during deceleration:
http://www.----------.com/72CJsmog.jpg
God Bless America, ßill O|||||||O
mailto:--------------------

Paul Calman wrote:
>
> EGR Theory. , mostly cut and pasted from sources like GM, Niehoff, etc.
> EGR serves one purpose and one purpose only. That purpose is to reduce
> Oxides of Nitrogen (NOx). Undernormal combustion, Nitrogen(N2)Oxygen (O2)
> in the air and Hydrocarbons (HC) in the fuel combind into water(H2O) Carbon
> dioxide (CO2) and the Nitrogen remains unchanged. Under very hot combustion
> temperatures, the Nitrogen reacts with the other two byproducts and forms
> Nitrogen oxide (NO). After being released into the atmosphere, it picks up
> another Oxygen and becomes Nitrogen dioxide (NO2). In the presence of
> sunlight, it combines with other compounds like Hydrocarbons and forms Smog.
> Since exhaust gas is inert (very stable) it doesn't burn again. So by being
> introduced into the combustion chamber, it will lower combustion chamber
> temps enough so that the Nitrogen doesn't react with the other compounds and
> is passed unchanged out the tailpipe thus not contributing to smog.
>
> Since exhaust gas doesn't burn, it doesn't exactly help with combustion. It
> does, however, prevent pinging at cruise or light throttle acceleration. If
> It pings under these conditions, but not under hard acceleration, hook it
> back up.
>
> --
> Paul Calman, Hathaway Pines, California

L.W.(=?iso-8859-1?Q?=DFill?=) Hughes III

Paul, the only time the Exhaust Gases Recirculation valve opens is on
hard deceleration. All that could do not allow air and mixture to be
suck through the carburetor during deceleration:
http://www.----------.com/72CJsmog.jpg
God Bless America, ßill O|||||||O
mailto:--------------------

Paul Calman wrote:
>
> EGR Theory. , mostly cut and pasted from sources like GM, Niehoff, etc.
> EGR serves one purpose and one purpose only. That purpose is to reduce
> Oxides of Nitrogen (NOx). Undernormal combustion, Nitrogen(N2)Oxygen (O2)
> in the air and Hydrocarbons (HC) in the fuel combind into water(H2O) Carbon
> dioxide (CO2) and the Nitrogen remains unchanged. Under very hot combustion
> temperatures, the Nitrogen reacts with the other two byproducts and forms
> Nitrogen oxide (NO). After being released into the atmosphere, it picks up
> another Oxygen and becomes Nitrogen dioxide (NO2). In the presence of
> sunlight, it combines with other compounds like Hydrocarbons and forms Smog.
> Since exhaust gas is inert (very stable) it doesn't burn again. So by being
> introduced into the combustion chamber, it will lower combustion chamber
> temps enough so that the Nitrogen doesn't react with the other compounds and
> is passed unchanged out the tailpipe thus not contributing to smog.
>
> Since exhaust gas doesn't burn, it doesn't exactly help with combustion. It
> does, however, prevent pinging at cruise or light throttle acceleration. If
> It pings under these conditions, but not under hard acceleration, hook it
> back up.
>
> --
> Paul Calman, Hathaway Pines, California

L.W.(=?iso-8859-1?Q?=DFill?=) Hughes III

Paul, the only time the Exhaust Gases Recirculation valve opens is on
hard deceleration. All that could do not allow air and mixture to be
suck through the carburetor during deceleration:
http://www.----------.com/72CJsmog.jpg
God Bless America, ßill O|||||||O
mailto:--------------------

Paul Calman wrote:
>
> EGR Theory. , mostly cut and pasted from sources like GM, Niehoff, etc.
> EGR serves one purpose and one purpose only. That purpose is to reduce
> Oxides of Nitrogen (NOx). Undernormal combustion, Nitrogen(N2)Oxygen (O2)
> in the air and Hydrocarbons (HC) in the fuel combind into water(H2O) Carbon
> dioxide (CO2) and the Nitrogen remains unchanged. Under very hot combustion
> temperatures, the Nitrogen reacts with the other two byproducts and forms
> Nitrogen oxide (NO). After being released into the atmosphere, it picks up
> another Oxygen and becomes Nitrogen dioxide (NO2). In the presence of
> sunlight, it combines with other compounds like Hydrocarbons and forms Smog.
> Since exhaust gas is inert (very stable) it doesn't burn again. So by being
> introduced into the combustion chamber, it will lower combustion chamber
> temps enough so that the Nitrogen doesn't react with the other compounds and
> is passed unchanged out the tailpipe thus not contributing to smog.
>
> Since exhaust gas doesn't burn, it doesn't exactly help with combustion. It
> does, however, prevent pinging at cruise or light throttle acceleration. If
> It pings under these conditions, but not under hard acceleration, hook it
> back up.
>
> --
> Paul Calman, Hathaway Pines, California

Paul Calman

> Paul, the only time the Exhaust Gases Recirculation valve opens is on
> hard deceleration. All that could do not allow air and mixture to be
> suck through the carburetor during deceleration:

The old ones did, but the new systems open at all kinds of crazy times.
Something to keep in mind when outfitting newer engines to old vehicles. The
99 Vortek we are putting in a Jeepster will have all of the smog crap except
for the cat.

--
Paul Calman, Hathaway Pines, California