Forced Induction Superchargers | Turbochargers | Intercoolers

Need help calculating compression ratio

Old 04-29-2017, 06:56 PM
TECH Apprentice
Thread Starter
iTrader: (1)
70c10's Avatar
Join Date: Jan 2010
Posts: 362
Likes: 0
Received 0 Likes on 0 Posts
Default Need help calculating compression ratio

Hey guys getting ready to order parts for my build. Broke #7 ringland so now I'm gonna forge the bottom end on my single turbo 2001 ls1. I'm looking at the -3.22 cc flat top wiseco piston with my stock 241 heads and ls9 head gaskets. Does 9.8:1 sound about right on the finished comp ratio? I will be running 91 pump gas with the possibility of meth. Turbo is a 70mm w/.96 ar. Would you recommend the compstar H beam rod or something else? Thanks in advance.
70c10 is offline  
Old 04-30-2017, 08:59 AM
Join Date: Feb 2015
Posts: 278
Likes: 0
Received 0 Likes on 0 Posts

Teach a man to fish and feed him for a lifetime. Google 241 chamber volume, ls9 gasket specs and then compression ratio calculator and plug in the numbers. Good to go.
tblentrprz is offline  
Old 04-30-2017, 10:34 AM
TECH Regular
Join Date: Sep 2011
Location: Washington
Posts: 431
Likes: 0
Received 0 Likes on 0 Posts

The big one is also knowing how far above or below the deck the piston is. And I realize it's boosted, but also understanding quench and working with that would be good too.
Nathaninwa is offline  
Old 04-30-2017, 04:44 PM
TECH Apprentice
iTrader: (2)
Join Date: Nov 2011
Location: Newport News, VA
Posts: 319
Likes: 0
Received 0 Likes on 0 Posts

You probably broke the ring land because your rings butted. Forging everything won't fix that.
Black89Z51 is offline  
Old 05-01-2017, 06:11 PM
TECH Resident
iTrader: (8)
Join Date: Mar 2013
Location: Washington
Posts: 852
Received 0 Likes on 0 Posts
Default Compression Calculator

The BallSS is offline  

Thread Tools
Search this Thread
Quick Reply: Need help calculating compression ratio

About Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to and affiliated sites.
  • Ask a Question
    Get answers from community experts
Question Title:
Your question will be posted in: