compression calculator.

Reply Subscribe

Thread Tools

Search this Thread

Apr 6, 2019 | 09:41 PM

fmijares

Thread Starter

Instructor

Joined: Jul 2017

Posts: 189

Likes: 9

compression calculator.

Hello,

Probably a dumb question but I dont know how to use the compression calculators.

I have a 2002 LS1. we did a full rebuild on the car with forged internals. with everything else being the same how much did my compression change from the stock 10.2:1

65cc Mamo 220 heads
-3cc forged pistons
cometic .40 gasket I think.

thanks guys

Apr 7, 2019 | 02:08 PM

Vetteman Jack

Administrator

Joined: Mar 2001

Posts: 367,660

Likes: 24,663

From: In a parallel universe. Currently own 2014 Stingray Coupe.

C7 of the Year - Modified Finalist 2021

MO Events Coordinator

St. Jude Co-Organizer

St. Jude Donor '03 thru '25

NCM Sinkhole Donor

CI 5, 8 & 11 Veteran

Moved to C5 Tech.

Apr 8, 2019 | 02:19 PM

Roman 1

Instructor

Joined: Nov 2013

Posts: 144

Likes: 22

From: Lees Summit MO

Quote:

Originally Posted by fmijares

You would need the following to complete the formula, Piston Stroke Length, Cylinder Bore Size and Piston Deck Clearance. Also, you show the Piston as a negative number, are they domed in or out or are they valve reliefs, doomed in will increase cylinder volume as would valve reliefs, doomed out would decrease cylinder volume? I used some basic numbers to compute the following... CR based on the following numbers, Finished bore size 3.998 assuming you bored it over .010, Stroke 3.622, Gasket thickness .040, Gasket bore 4.010, Camber volume 65cc, Valve reliefs +3 (I know you showed them as a negative but when I plugged them in as a negative it brought your compression up to 11.92:1) and piston to deck clr as -.010. With those numbers your compression would be appox 11.04:1.

Like I said though this is based off numbers I'm guessing at and really just wanted to give you an idea of what is required to compute it correctly. Here is a link to a on line calculator you can use once you get the actual numbers for your car. http://www.csgnetwork.com/compcalc.html

Last edited by Roman 1; Apr 8, 2019 at 02:24 PM.

Apr 9, 2019 | 08:48 AM

VFR RC46

Instructor

Joined: Aug 2018

Posts: 153

Likes: 16

I really like Zealautowerks, Awesome for compression/rod:stroke ratios/piston speed&acceleration/ finding piston to deck clearances etc.... I just wish they'd make the same calculator preset to LS based engines. You can just manually punch your information in there though (and x2 if you want displacement).

https://www.zealautowerks.com/bseries.html

Last edited by VFR RC46; Apr 9, 2019 at 08:49 AM.

Apr 9, 2019 | 11:22 AM

fmijares

Thread Starter

Instructor

Joined: Jul 2017

Posts: 189

Likes: 9

awesome thank you guys. I just dynoed it sunday and it put down 449whp with stock intake and tb. mamo 220 heads and blower cam.

Reply Subscribe

Reply Share

First
Prev
1 / 1
Next
Last

Forum Jump