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how do i get compression ratio

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Old Sep 30, 2005 | 09:44 PM
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Arrow how do i get compression ratio

i have a gsr stock head and block 81mm with a compression of 270 how do i turn that number into a ratio?

Last edited by 92hatchGSR; Sep 30, 2005 at 09:46 PM.
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Old Sep 30, 2005 | 09:50 PM
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wow all I can say is you have really high cylinder presure are you sure you did the compresion test correctly?
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Old Sep 30, 2005 | 09:53 PM
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yes i did it a couple of times on each cylinder and its 270 across the board
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Old Sep 30, 2005 | 09:56 PM
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Thats somewhere close to 11.8:1 - 12:1 c/r.. Jamie's was 275 and it was 12:1 I think..
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Old Oct 1, 2005 | 06:29 AM
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if you have a gsr then it has b16 piston in it,unless forged..but the lastest gsr i build with a untouched head and itr pistons was 260...but i am with jasooon on this your around 11:7 11:9
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Old Oct 1, 2005 | 12:57 PM
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Originally Posted by Jaso0on
Jamie's was 275 and it was 12:1 I think..
11.5-1.
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Old Oct 1, 2005 | 12:58 PM
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Originally Posted by 92hatchGSR
i have a gsr stock head and block 81mm with a compression of 270 how do i turn that number into a ratio?

http://www.c-speedracing.com/howto/c...c/compcalc.php
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