dropping the compression ratio - LS1LT1 Forum : LT1, LS1, Camaro, Firebird, Trans Am, Engine Tech Forums
LinkBack Thread Tools
post #1 of 2 (permalink) Old 04-08-2007, 09:07 AM Thread Starter
Regular Member
Join Date: Aug 2005
Location: Clarksville,TN
Posts: 656
Send a message via AIM to NXSLT1
dropping the compression ratio

As some of you know I've been working on a roots blower setup for my car. Everything I have fabbed up is working flawlessly now but I've come to the conclusion that it just aint gonna run on the stock compression ratio. I've gotta get it lower. I know the easiest way would be to put thicker head gaskets on but that will open up the squish area quite a bit and make the detonation problem even worse probably. My only option other than that (with the exception of pulling the motor) is to hog out the combustion chambers. I was just wondering if anybody knows how much someone like Loyd Elliot hogs the combustion chambers out when they unshroud the valves?? I was using the CR calculator at the top of the page and according to it I need to hog them out to about 73 cc to get it down to an 8.5:1. I know some aftermarket heads are 76cc, I'm just curious if I have enough material there to hog it out that much. Any of you guys that have had head work know what yer cc's were??

96 Trans Am M6: 52MM TB, LT's, true duals over the axle with Hooker Aerochamber mufflers, Granatelli LCA's and Panhard rod, SLP shifter, 9" with 4.11, Mickey ET streets......oh yeah, a roots blower that fits under the hood

currently working on roots blower kits for the F-Body, stay tuned..........


NXSLT1 is offline  
Sponsored Links
post #2 of 2 (permalink) Old 04-08-2007, 02:38 PM
03slowZ06's Avatar
Join Date: Jul 2006
Location: Jacksonville
Posts: 7,520
Send a message via Yahoo to 03slowZ06
The most i have seen from cc work, including polishing everything is 62 on a stock head.

03 Z06, LTs, A&A P1SC running 6psi, 550/471
Originally Posted by 94FormulaBird View Post
drivers side is a dream....passenger side on the other hand...i lost 2 screwdrivevers and a socket when i chucked them in the woods

u can do it

I am permanently banned from all petting zoo's for getting to friendly
03slowZ06 is offline  
Sponsored Links


Quick Reply

Register Now

In order to be able to post messages on the LS1LT1 Forum : LT1, LS1, Camaro, Firebird, Trans Am, Engine Tech Forums forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Please enter a password for your user account. Note that passwords are case-sensitive.


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:


Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page

Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

For the best viewing experience please update your browser to Google Chrome