Ok, I am wanting to find out what stock compression should be on a 97 z-24 2.4l. Mine reads about 210 - 215 all the way across. I would also like to find out about vacuum and how to check it and how much it should be? Thanks in advance and yes I did search but didn't find the answers I was looking for.
210-215, think that sounds kind of high, I though it was 180psi for these engines.
A vacuum gauge should read about 21 at idle, you need to find a vacuum hose going to the engine and plug the gauge in there
When you have 21 at idle, and you snap the throttle quicky and quicky release, it should return to 21 very fast, it will do down quite a bit, but should be return
What probelm are you working on fixing
- 2004 Cavalier - 124k, owned since new
I believe the GM manual stats that a normal compression engine will produce 150 within 4 strokes, or something like that. but 215 sounds good, as long as they are all within 5% or so. Mine with 8.9:1 is 190. your stock is 9.5:1 or 9.7:1, so expect 210-225
HP Tuners | Garrett T3/T04B | 2.5" Charge Pipes | 2.5" Downpipe | 650 Injectors | HO Manifold | Addco front/rear | Motor Mounts | HKS SSQV | Spec stage 3 | AEM UEGO Wideband | Team Green LSD | FMIC | 2.3 cams | 2.3 oil pump swap | 280WHP | Now ECOTECED
My stone stock 96 Cav 2.2 with 135,000 runs 150 lbs with a 2% variance between at five cranks each...has for the past 5 years.
Vacuum question already answered.
Ok thanks guys. I was really wondering about the compression because I know most 4 cylinders are a lot lower than that. Just wanted to know what stock was supposed to be.
