Compresstion Help

car9fan · 01-07-2006, 06:56 AM

Quote:

Originally Posted by Jeff Chambers

You're right, I must have been on dope when I posted that. Generally speaking its 3-5% for a full point of compression. Thanks for correcting me! All I had to do was read the page I referenced!

SO what your saying is if my motor with 10.5.1 compression had 400 HP and with 9.5.1 i will loss 60 HP, And if so is there anything i can do to raise the compression with just taking the heads off. I really didnt want to pull the motor right now, Thanks Ronnie

1989GT · 01-07-2006, 02:19 PM

No what we're saying is if you did drop your CR from 10.5 to 9.5 on a 400hp motor you would lose about 15hp or so. The easiest way to make that back up it to take the heads and have them milled. Infact if you have enough piston to valve clearance you could take them down quite a bit and get your CR above 10.5:1.

01-07-2006, 02:19 PM	#2
1989GT Registered Member Join Date: Apr 1999 Location: Cincinnati,OH Posts: 1,511	Re: Compresstion Help No what we're saying is if you did drop your CR from 10.5 to 9.5 on a 400hp motor you would lose about 15hp or so. The easiest way to make that back up it to take the heads and have them milled. Infact if you have enough piston to valve clearance you could take them down quite a bit and get your CR above 10.5:1. __________________ 89GT,Pro-Bullet 306, H/C/I and a bunch of other stuff. Sold 00GT, Vortech S-Trim, Steeda Boost Pipe, C&L intake, Mac off-road H-pipe, Flowmasters, B&M Ripper shifter, Eibach Sportline springs, Koni Struts/shocks, MM full length subframe connectors, Cobra brakes, 3.73's. My Car Domain Page