Comprestion Ratio
'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
static, not dynamic. i would imagine their dynamic compression on a 12.5:1 static isn't any higher than what we are running. I know NOTHING about honda motors, so that might just be completely wrong, but that's my first inclination~!
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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.
Originally Posted by MUSTANGEATER
I would advise you to weld the chambers . . .
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.
Think about reshaping the chamber for efficiency and a better flame area. 
Teching In
Joined: Nov 2004
Posts: 39
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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.
Originally Posted by TheMNkid
I mean what stuff can you get away with? Also, who welds heads? Thnaks Mustangeater!
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.