Comprestion Ratio
#1
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Join Date: May 2004
Location: DFW/Waco, TX
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Comprestion Ratio
this may sound retarded, but how do you know what is the correct ratio for your car, and how do you check it?
sorry i dont know much about cars.
sorry i dont know much about cars.
#2
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'Correct' is a funny word.
Stock is 10.2:1
Boost needs lower compression, nitrous likes higher, N/A most guys don't go over 11.1:1 due to the gas we can get ( 92-94 octane ).
As far as checking it:
http://www.rbracing-rsr.com/compstaticcalc.html
Stock is 10.2:1
Boost needs lower compression, nitrous likes higher, N/A most guys don't go over 11.1:1 due to the gas we can get ( 92-94 octane ).
As far as checking it:
http://www.rbracing-rsr.com/compstaticcalc.html
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#14
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I would advise you to weld the chambers or angle mill the heads. There is no correct compression ratio. If you are going to run 93 octane I'd work on other mods to support a pump gas motor with good compression. The right cam, quench and cooling will allow you to get away with a lot of stuff you don't normally think you can.
#17
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Originally Posted by TheMNkid
Like what? I have a custom cam from EDC but it wans't built for compression. Mild cam. But it got me thinking about porting my heads and maybe bumping the compression up.
Just to list a few, Evans coolant, engine coatings, and the proper quench come off the top of my head. The most important part is paying attention to your timing, and Dynamic Compression Ratio
How often is this done on LSx heads? Seems like an advantage over milling them is you would not loose P2V clearence.
#18
Originally Posted by MUSTANGEATER
The right cam, quench and cooling will allow you to get away with a lot of stuff you don't normally think you can.
#20
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Well I have a good welder for welding aluminum, but I'm a pretty shitty porter! However, I'm trying to improve.
What general areas in the combustion chamber would be best for depositing some aditional metal? I assume away from the valves to avoid blocking flow. I need some more compression, but I would rather not mill the heads.
What general areas in the combustion chamber would be best for depositing some aditional metal? I assume away from the valves to avoid blocking flow. I need some more compression, but I would rather not mill the heads.