ya know looking at my 77 f150 versus my 85 f150....
look to be about the same motor.
and since my truck is too old for emissions to apply in my state,
is it feasible to remove all that egr, vacuum etcetc and throw on a simple single barrel carter carb ie same configuration as the 77?
its amazing how all that extra emissions hosery and electronics makes the two engines look completely different lol
or am I way off base here?

 

There is no reason to remove EGR; there are no performance or mileage improvements despite all the misinformed hype. If you remove the EGR, you have to remove the vacuum advance on your distributor and replace it with an adjustable one to flatten out the timing curve and you may also have to install new springs under the breakerplate. Furthermore you will have to richen up the carburetor by re-jetting it in a toil-some trial-and-error process. At best, with a lot of tuning, you will only get back to where you started.

Anyone that tells you to remove EGR because it is sucking power from the engine is completely wrong; to date there is no reliable data that shows EGR has any noticeable effect on power. EGR also helps to cool the combustion chambers and without it you will introduce many problems with pinging and sometimes dieseling. It is a common misconception that it is "smog junk," while it was originally introduced to reduce NOx emissions by displacing a small amount of air\fuel mixture at part-throttle, it serves many more purposes than that. I agree that vacuum lines running all over your engine are not the prettiest thing, but unless you need to get rid of it because you're going to a 4 barrel intake or some other credible upgrade and you are prepared to properly tune the system as a whole, make your life easier on yourself and leave it be.

 

ok thanks

 

And just to add this, A properly working EGR valve can actually increase your mileage.

Think of it this way...

The EGR introduces a small amount of exaust back into the combustion chambers.

Your cylinders are going to be the same size no matter what you do, so...

If you removed the EGR valve, what type of gas is going to replace the exaust to "fill up" the combustion chamber?

That's right, Fuel.

Don't remove any of it, unless it's defective and causing you problems. And repair is always better if you can.

Hope this helps.

 

not to be a smart ***, but when you add the exhaust gas back into the cylinder and less air/fuel is in the cylinder... dosent that mean you would need to add more fuel to get an efficient combustion? i wouldnt know, i went 4bbl when i got this 302 and got help tuning it.

 

Kuskoal: No, it doesn't. Exhaust gas is inert in the combustion chamber and it literally displaces a set amount of the air\fuel mix. The remaining air\fuel ratio therefore remains the same. And 81-F150 is correct about what he said about mileage.

 

Another thought for ya' cooploops, why fix sumthin' that aint broke??

 

I am with the people that say don't take it off. But I do not like them either. They are just something else to break or fail, and they will break and give you problems eventually. Just by the nature of what they do, they burn out after awhile and need replaced. All that carbon and moisture from the exhaust just eats it up. And if you are having rough idle and stalling problems, the EGR is one of the components that need to be checked.

But if you have a completely stock engine, you need to keep it on there, and keep it working. If you go with a non-emissions carb setup, you can usually do away with it.

 

been there, done that on an 80 merc grand marquis 351. made a block off plate. ran like crap, AWFULL pinging under light accleration. after about a week I put the EGR back on. IMO, they're right. nothing to be gained, unless eliminating the soot from the intake passages is a "gain".

Regards,