compression bump
Thread Starter
Melting Slicks
Joined: Dec 2001
Posts: 2,437
Likes: 1
From: Gainesville Fl
compression bump
when i have my heads off to replace the gaskets and do a couple other things i am going to put the Impala head gaskets on whhich claim a 0.3:1 compression raise. i am also thinking about having my heads shaved as well and my mechanic says that wwith both that and th head gaskets i should be up to 11.5:1 compression. ( i have 10.8:1 now stock) how noticeable is this going to be in power increase? i know every little bit helps and i will be doing quite a few other power bolt ons and such at the same time but just curious on opinions how much power that kind of a bump will give me
Racer
Joined: May 2001
Posts: 472
Likes: 0
From: Tampa Bay Area
The law of diminishing returns applys here the biggest increase in thermal effiecincy is between 8:1 and 9:1 after that it starts to taper off pretty well. You might be able to squeeze 4%, it would be interesting to see how much power you would make. Dyno it before and after and let us know. Also will you be able to run pump gas with that much compression?
Thread Starter
Melting Slicks
Joined: Dec 2001
Posts: 2,437
Likes: 1
From: Gainesville Fl
the reverse flow sooling systems of the late model C4s lets you run pretty high compression on 93 octane. i probably wont spend to much time in the upper RPMs without race gas but should be a nice improvment
Le Mans Master
Joined: Feb 2000
Posts: 9,715
Likes: 27
From: Kempner Texas
Originally Posted by 1996man
when i have my heads off to replace the gaskets and do a couple other things i am going to put the Impala head gaskets on whhich claim a 0.3:1 compression raise. i am also thinking about having my heads shaved as well and my mechanic says that wwith both that and th head gaskets i should be up to 11.5:1 compression. ( i have 10.8:1 now stock) how noticeable is this going to be in power increase? i know every little bit helps and i will be doing quite a few other power bolt ons and such at the same time but just curious on opinions how much power that kind of a bump will give me
Jake
Le Mans Master
Joined: Feb 2000
Posts: 9,715
Likes: 27
From: Kempner Texas
Originally Posted by 1996man
i need to find that out. i know its been posted on here before. i dont have that info right now. sorry
Jake
