piston compression ratio help

1455 Views 2 Replies 3 Participants Last post by lurker, Dec 17, 2014

k20a/z3

Discussion Starter · Dec 10, 2014

I am going to do my Frank build and I was wondering how low of a compression is too low before you need to add boost? I have the z3 head with k24 block. I want to bboost it eventually but not for a while. What compression ratios should I run for now? Or should I go as high as I can and just buy new pistons again when I buy the turbo kit?

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w00t692

· #2 · Dec 16, 2014

depends on what k24 block you've got as to what compression it will end up being.

I'd suggest whatever your goals, you shoot for something around 10.5:1 static compression ratio.

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lurker

· #3 · Dec 17, 2014

k20a/z3 said:
I am going to do my Frank build and I was wondering how low of a compression is too low before you need to add boost? I have the z3 head with k24 block. I want to bboost it eventually but not for a while. What compression ratios should I run for now? Or should I go as high as I can and just buy new pistons again when I buy the turbo kit?

1pt of compression ratio on a K20/24 is going to net you ballpark 3%-4% in power, so anywhere from 6-12whp based on what sort of parts/headwork you have.

I wouldn't worry too much, just aim for something in the 10:1 range. Mahle makes an excellent piston for this application:

Mahle Pistons PowerPak (ACR181425I09) 02-10 Acura and « Free Shipping

4032 allow so it's low expansion/better for a daily car.

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