Confused...How do I figure out my compression ratio---Look inside.
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From: All around, De/Pa
Confused...How do I figure out my compression ratio---Look inside.
Ok, Im trying to figure out my c/r by using the cspeed site found here .
I have a stock LS, I will be using stock head gasket, stock bore, stock LS head.
I have JE #176449 pistons which call for a 9.8:1 compression in a Gsr.
Using this unit conversion page , I am supposed to convert the dome volume to cc's. Using JE's pdf spec file for their pistons . The dome volume size is -1.7" which is -4.32 centimeters. Im not sure if I am using the correct unit conversion since the numbers im converting are'nt in cubic inches, just inches--and ending up with centimeter, not cubic centimeters.
I keep getting 9.0:1 as the compression ratio. This has to be wrong, cause when I plug in those numbers for a stock gsr it comes out to be 9.3:1. And they are supposed to be 9.8:1 for the Gsr?!?!? WTF!
Someone please help me out. What the hell am I doing wrong??
~Dan
I have a stock LS, I will be using stock head gasket, stock bore, stock LS head.
I have JE #176449 pistons which call for a 9.8:1 compression in a Gsr.
Using this unit conversion page , I am supposed to convert the dome volume to cc's. Using JE's pdf spec file for their pistons . The dome volume size is -1.7" which is -4.32 centimeters. Im not sure if I am using the correct unit conversion since the numbers im converting are'nt in cubic inches, just inches--and ending up with centimeter, not cubic centimeters.
I keep getting 9.0:1 as the compression ratio. This has to be wrong, cause when I plug in those numbers for a stock gsr it comes out to be 9.3:1. And they are supposed to be 9.8:1 for the Gsr?!?!? WTF!
Someone please help me out. What the hell am I doing wrong??
~Dan
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Joined: Feb 2002
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From: Basin, WY
Re: Confused...How do I figure out my compression ratio---Look inside. (93LSivic)
I was playing with the calculator and if you put P72 pistons in the B18B block (is it even possible?) you'd get a 9.6:1 compression ratio.
Since those JE pistons knock the compression ratio in the GSR down from 10.0 to 9.8, I'm going to guess you'll have around 9.4:1 compression in your LS block with an LS head...
I bet I'm waaay off
Since those JE pistons knock the compression ratio in the GSR down from 10.0 to 9.8, I'm going to guess you'll have around 9.4:1 compression in your LS block with an LS head...
I bet I'm waaay off
Thread Starter
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Joined: Jul 2001
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From: All around, De/Pa
Re: Confused...How do I figure out my compression ratio---Look inside. (xThexHeadx)
Since those JE pistons knock the compression ratio in the GSR down from 10.0 to 9.8
I bet I'm waaay off
I bet I'm waaay off
Can someone tell me if I am using the correct unit conversion to find the cc's of the dome?
UP
Thread Starter
Honda-Tech Member
Joined: Jul 2001
Posts: 5,608
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From: All around, De/Pa
Re: Confused...How do I figure out my compression ratio---Look inside. (93LSivic)
Need to get another bump up on this. Help me out.
Now I have a chance of going lsvtec, so Im way confused....
Now I have a chance of going lsvtec, so Im way confused....
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Joined: Jun 2001
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From: Dark Aether
Re: Confused...How do I figure out my compression ratio---Look inside. (93LSivic)
Just call JE and ask them for the dome/dish volume of that particular piston as well as the compression height. The rest will be easy. That info is definitely available. SRP (made by JE) posts it publically:
http://www.flatlanderracing.com/srpacura.html
JE does not though. I've talked to Randy at JE a few times and he's been helpful. Once you know the dome/dish volume and the compression height, the rest is easy. You need to know the compression height so that you can calculate the piston-to-deck clearance.
Sonny
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