Unknown Part! (maybe just me)

[The Wagprocrastinator]

I have a 86 GW. Right next to the master cylinder on the inside toward the center. It has roughly 1 inch hoses running to it. Any idea what this might be? What does it do and is it needed.
Kinda lost on this one. I'm new to Jeeps.

[billyrb]

If it attaches to your power brake booster, then it is the vacuum line (should run from the intake manifold to the brake booster). This is required so that when running, your rig has power brakes.

~ryan

[The Wagprocrastinator]

It has hoses that hooks to adapters that hooks to metal lines that hook to the exhaust manifolds.

[RWC]

Part of the smog equipment.

RWC

[The Wagprocrastinator]

Do you actually have to have that smog equipment? What does it do? What would happen if you took it off?

[Iron Horse]

It all depends if you have to pass a smog check in your area.......

[FSJeeper]

Originally posted by buckeyefan:
Do you actually have to have that smog equipment? What does it do? What would happen if you took it off?It is part of the AIR smog system. What it does is inject air into your exhaust manifolds so any unburned charged will finish burning thereby reducing emmisions. You can take it off and seal the tubes going into the exhaust manifold, but it won't gain you much other than to clean up your engine compartment.

This part of your smog system uses 1/2 HP max and you will see no increase in performance or gas mileage by romving it. If you are in a state that requires smog equipment, I would not do it.

[The Wagprocrastinator]

I don't think that I do. Are there any advantages or disadvantages to not having the smog equipment. Would the exhaust manifolds need to be changed to non-smog? If so what is the best to use? What all changes would have to be made?

[Va-Rob]

If you don't care much for the enviroment go ahead and remove it. Otherwise leave it to do it's job. it really dosent take away any power from the Jeep. If you do disconect it the cataletic converter would eventually fail.

Rob

[sailingjeep]

Try a search, there are a lot of topics with debates about removing/leaving the smog equipment and whether or not it kills your cat.

[Rande]

So, since it will kill the catalytic converter, lose the cat too.
The EGR valve sends burned exhaust gases into your intake manifold and contaminates your air/fuel mixture. There is another candidate for the scrap barrel. Contaminating your incoming air/fuel mixture with exhuast gases, there's world class idea.....NOT!
Removing the smog equipment leads from one thing to another. The vacuum system sends vacuum to different parts of the engine at different times depending on the temperature of the engine coolant. When the engine is cold, a certain amount of vacuum is allowed to the distributer, and the EGR. When the engine warms up the vacuum changes. It is controlled via switches that are controlled by the coolant temperature. The vacuum to the distributor comes from one source when the engine is cold and then from another source when the engine is hot.
If you want to eleminate all this crap, you have to find out what the engine needs and where to get it when you remove all the factory stuff. To eliminate the EGR, you may need a different intake manifold. The carb is built to work with the EGR, when you remove the EGR, how do you change the carb to work properly in the new configuration?
To simplify your engine, you will need to remove all that smog crap including the vacuum control system. Then you will need to readjust the carb (perhaps even replace it with a non-smog carb), re-plumb the vacuum advance, probably change the initial timing and recurve the distributor advance. You will need to plug the exhaust manifold A.I.R. holes. Because the government of our "free country" restricts the manufacture and sale of exhaust pipes bent into a certain shape, you will have to fabricate a length of pipe to replace the converter. Trying to get an exhaust shop to make one make take some searching.
To eliminate the smog equipment takes some planning and forethough. Removing things piecemeal will leave you with a poor running engine.
I fully support the removal of the engine choking smog equipment. The EGR is the last part I need to remove from my engine.

[THEWOODY]

One problem with taking off the smog equiptment is if you leave your cat. converter on, it can get really hot, My smog pump seized, and i ran without it for a while, the cat actually caused my rug to start burning.

[letank]

The EGR helps to cool off the temperature inside the cylinders.... thus helping your engine to stay cool. Also removing the EGR yu will lean the engine...... and thus need to richened it with the idle mix screws.....

i played with the EGR for a while....

So EGRs are good

Cheers

Michel
74 wag (with all the smog goodies)

[Rande]

Right, it cools the engine by diluting the air/fuel mixture. Less mixture to burn=less heat=less power. The idea behind this is to reduce the NOx emissions. Slightly increased NOx emissions from a couple dozen Jeeps will , of course, destroy the Earth so think twice here.
If you want to change the air/fuel ratio, you do it by changing the jets in the carb. Fiddling with the idle mixture screws will change the...(You got it!)...IDLE MIXTURE!

[Don S]

Originally posted by buckeyefan:
I don't think that I do. Are there any advantages or disadvantages to not having the smog equipment. Would the exhaust manifolds need to be changed to non-smog? If so what is the best to use? What all changes would have to be made?..
buckeyefan:...
One other disadvantage to removing the smog GARBAGE is if you decide to sell it I, for one would not consider buying it.
Good Luck and keep it running.. CUL ;) … ds..
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[Torque]

I'm under the impression that at WOT the egr isn't an issue.At cruising the egr allows burnt gases which help cool engine temp reducing pinging, allowing leaner mix(fuel savings)and occupying some of the cylinder volume(fuel savings).I'm also wondering how much increase in performance one gets,has anyone ever dynoed an engine before and after an egr removal?

[Stuka]

A leaner mixture (more air less fuel) burns HOTTER. Most 80's and up engines run on the lean side to get emmisions down, and when they burn hotter more of the air/fual is burned. BUT...you loose power because of the temp. A richer engine will burn cooler and produce more power (more fuel).

The EGR reduces pinging because its sending exhaust fumes back into the cylinder. These exhaust fumes still have unburned fule in it. This richens the mixture, which is what stops the pinging. Sending exhaust temps that are up near 450F back into the engine is not going to cool it. It also preheats the fuel in the carb/intake to get it hotter so it burns cooler. In the end a EGR does NOT increase power.

Removing the EGR will make the engine run cooler, and it will make it run slightly leaner. You will need to richen the carb when its removed. Unless your moving a performer intake with no EGR, and a performer carb. As the performer carb comes rich.

The EGR does do what its designed to do. They are stilled used to this day. Also if you notice newer engines are designed to run hot. Many run at 220-240. This being mostly 4 and 6 cylinders. Most V8's dont run up that high.

Who ever says the EGR cools the engine needs to go back to physics class (no offence to anybody intended)