I'm Doing a cam in my car pretty soon. I'm thinking while I'm doing the cam, I will delete the AIR and EGR systems of my car. I'm not worried about emissions. According too shbox, deleting EGR can cause engine overheating, and spark knock. Is this true? I do understand once done, i can get the pcm tuned so that no check engine lights come on for these systems. Is this a good idea? Or bad idea???

Here's the link for shbox http://shbox.com/1/4th_gen_EGR.html

 

If it's on Rob's page it's true

Unfortunately, you have misinterpreted one thing. Disabling the EGR does not lead to overheating of the engine. It leads to high combustion chamber temps which lead to spark knock.

The EGR system allows some exhaust gasses flow into the chamber at part throttle to cool the chamber and reduce the formation of oxides of nitrogen. It does not affect power as it doesn't operate at idle or full throttle.

 

I was just saying what was on shbox's page. it says...
Too little or no EGR flow can allow combustion temps to get too high during acceleration and load conditions. This could cause:

-Spark knock (detonation)
-Engine overheating
-Emission test failure

Judging by his statement, you think it would be a bad thing too delete the egr..... but don't many people do it??? His page also states lt4's didn't require an egr system due the cam design used... I'm getting a 226/232 .578/.574 110 LSA grind from Lloyed elliot if that matters....

 

What you quoted above does not say anything about the engine overheating. It states exactly what bw_hunter stated - lack of EGR flow can lead to high combustion chamber temperatures.

Lot's of people delete EGR because 1) they think it will help their engine's performance - but it won't; 2) they don't know that EGR can help prevent detonation (knock) under certain engine operating conditions like lugging at low RPM in the wrong gear; 3) to "clean up the engine bay", which really doesn't change much at all, since it's tucked away in the back under the cowl.

I built an 800HP nitroused LT1, and kept all the emissions systems intact - cats, EGR, AIR, EVAP. There was no significant affect on performance of the engine. As noted, EGR doesn't operate above 3,500 RPM or at wide open throttle. AIR only runs for a couple minutes at startup to help the cats heat up.

 

The overheating info is directly sourced from the factory manual. I would say it would have to be an extreme case to cause a real overheating issue. LT1s are a little sensitive to overheating, so it pays to know what different parts play in keeping it cool.

 

You might want to reread what he quoted, and you requoted.