Gauge

iTrader: (3)

I'm trying to calculate exactly what my compression ratio will be in different situations. I just disassembled my 100% stock LS1 shortblock. I'm using this calculator, and I'm not sure of the numbers it's giving me.

With all the default values the calculator says 10.0:1. Isn't the LS1 10.3:1 stock? Where are these values wrong? I was pretty sure that an '02 had .054" head gaskets where they have .055" entered. Also, I thought the combustion chamber on the LS1 heads was 66.67cc, not 67cc. Are these right? Are there any other inaccuracies in the default values here? All I'm changing is piston dish size, gasket thickness, and combustion chamber.

Thanks in advance, everyone.

JPH

iTrader: (2)

change you deck height to -.007, and see what happens then. and .054 is gasket thickness.

Gauge

iTrader: (3)

Deck height will not accept a negative value. When the piston comes out of the bore, is that negative or positive?

Randy WS6

iTrader: (69)

Try this ,It might help

http://www.c5frc.com/calculators/Com...Calculator.htm

Gauge

iTrader: (3)

That's the calculator that I was already using. It's saying 10.0:1 CR with the default values. Isn't a stock LS1 10.3:1? If so, which of these default values is wrong? Or is the calculator itself wrong?

GuitsBoy

iTrader: (4)

Try this one:

http://kb-silvolite.com/calc.php?action=comp

JPH

iTrader: (2)

yes use the kb-silvolite.com calculator, that's the one i use also. you can use -/+ numbers. piston out of deck means (-).

N4cer

iTrader: (11)

If I'm not mistaken, the gaskets are like this:

GM MLS: .060"
GM Composite: .054"

383Z4ME

http://members.uia.net/pkelley2/DynamicCR.htmlis a good article about the different factors involved with links to a calculator
http://members.uia.net/pkelley2/dcrvb6.zip is a downloadable link for the calculator only