col Posted May 10, 2011 Share Posted May 10, 2011 How much hp is gained, ( all other things being equal). In a l28, stock stroke , Ported head , extractors , Mild cam (not sure of spes) I'm rebuilding my rally car and deciding weather it's worth going to 89mm bore. If I go 88mm I can use std gaskets. Does 100cc make enough difference in hp to be concerned about? Quote Link to comment Share on other sites More sharing options...
johnc Posted May 10, 2011 Share Posted May 10, 2011 The best you can hope for is a 3.6% increase in power, assuming a perfect utilization of that extra 100cc. On a 200hp engine that's 7.2hp. Your call. Quote Link to comment Share on other sites More sharing options...
col Posted May 11, 2011 Author Share Posted May 11, 2011 (edited) The engine has never been on a dyno, but I'm sure it won't put Near the 200hp. Should be better than it was , with better compression from the new bore and a bit higher compression ratio from the 2mm overbore. Looks like I'll use the VG30 +40", 88mm pistons. Edited May 11, 2011 by col Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.