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compression

This is a discussion on compression within the Internal Engine forums, part of the LSx Technical Help Section category; what the relation of combustion chamber size to compression? i know the smaller the chamber the higher the compression, but ...

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    compression

    what the relation of combustion chamber size to compression? i know the smaller the chamber the higher the compression, but whats the equation? the pistons in the shortblock i have should yield 10.5 to 1 compression with stock ls6 heads. (at least thats what i asked them to give me), but im looking to get just under 11 to 1 so i can still run pump gas.

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    O U 8 1 2 Spaz's Avatar
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    Quote Originally Posted by emotionalpiracy View Post
    what the relation of combustion chamber size to compression? i know the smaller the chamber the higher the compression, but whats the equation? the pistons in the shortblock i have should yield 10.5 to 1 compression with stock ls6 heads. (at least thats what i asked them to give me), but im looking to get just under 11 to 1 so i can still run pump gas.
    you can run pump gas with 12.1 comp...

    http://www.csgnetwork.com/compcalc.html
    calculator...

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    Slow'er'Ass Mr. Luos's Avatar
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    Quote Originally Posted by Spaz View Post
    you can run pump gas with 12.1 comp...
    I wouldn't recommend it though.


    I use this calc. myself. Set-up for the LSx.
    http://www.c5frc.com/calculators/Com...Calculator.htm

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    O U 8 1 2 Spaz's Avatar
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    Quote Originally Posted by Mr. Luos View Post
    I wouldn't recommend it though.


    I use this calc. myself. Set-up for the LSx.
    http://www.c5frc.com/calculators/Com...Calculator.htm
    i wouldn't either... but there are some people doing it for DD and then using race fuel when they get to the track...

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    I just ordered some pistons w/+10cc dome. I should be at 13:1

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    well im just looking for the highest compression that i can get the most power and efficience with 93 octane; which i thought was 11. i looked up all the part numbers for the stuff thats in my shortblock to double check. pistons are -6. according to lingenfelter those pistons with a 4 inch crank and 64 cc heads make 11 compression. according to that site from mr luos it would be 11.3. only variable there would be the gasket thickness i suppose lingenfelter didnt calculate that.

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