I live in the UK and i have no idea what the h~ll a smog system is or does, what happens when i put the engine (rebuild) in without out it or do i have to put it on or just a waste of time? do all American cars have this system, just as my car here doesnt am confussed

 

Smog is a combo of smoke and fog hence SMOG, if you have to pass emmissions put it on, if not dont (unless you want to be environmently friendly)

 

all american cars after 1975 or something will have one, unless it was removed (if you live in Missouri, I hear that the emissions laws are being reduced to post-1990 makes and models)

 

1967 was the first year of the "emitions era" actually... '69 it stepped up a bit more, then '72 or so it was in full swing.

 

I still think that, if you are tuned for all out performance, you are environmentally friendly. If we are tuned for performance, aren't we tuning to burn as much fuel as possible? Running rich never made anything I ever owned run better - it always slowed it down.

 

Exactly, however the emission people, tree huggers etc, don't see it that way.

 

I dunno much about SMOG because where I live there are no emissions laws, but from what I understand the system is composed of 3 items, the EGR pump (on the intake), the AIR pump (on the serpentine belt system under the A/C unit), and the Catalytic Converter (between exhaust Y-pipe and Midpipe usually under the pass seat). These three things work together to make the engine emissions more environmentally friendly. You can remove them, you can block off the EGR plate on the intake, you can remove the AIR pump and put in a delete pulley or re-rouse the belt, and you can remove the Cat and have a pipe welded in, engine will still work. But to really do it properly you'll also want to delete anything in the ECM chip or PROM related to EGR and AIR. I removed mine on my IROC-Z simply to have better access to the engine when working on it, I dont think there is really a performance downside but I dunno for sure.

 

Its the devil.

 

I found this site that seems to explain stuff pretty well.
Emission Control: Air Injection

You don't really need the AIR system ("smog" pump, tubes, etc). It really doesn't do much once the car is warmed up. Here's a great thread that shows all the components:
https://www.thirdgen.org/forums/faq-...injection.html

The catalytic converter is the biggest emissions reducing device and really isn't that big of a restriction unless it gets plugged.

EGR can give you a little better gas mileage and can lower combustion temps. A lot of people say it hurts performance but if I remember correctly the EGR valve closes during wide open throttle. Removing this can also cause your Check Engine light to turn on.