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Registered
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Discussion Starter #1
i saw how to do it on this site somewhere but cant remember where and cant find it again but...

how do you convert the psi results of a compression test into an approx compression ratio??
 

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FF Misfit
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4,881 Posts
Bump, I wouldn't mind knowing how to do this for when I get my H23 done.
 

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FF Misfit
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Thanks for the info. Hey Bone you wouldn't happen to have a more specific # to add would you?
 

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D-series Janitor
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Its really tough to say given valve events play such a huge part of dynamic compression. Its why there is a difference between static and dynamic.

With that said, I have found that closer to 17 is about right.
 

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Discussion Starter #7
i believe bones was the one who posted it the first time i saw it.
 

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FF Misfit
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Thanks ya'll. Since I'm building a H23 w/ Type S pistons it's really hard to get the exact #'s on what my CR will be so this is good info to have. :TU:
 

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the artist formerly known as drexelstudent11
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Thanks ya'll. Since I'm building a H23 w/ Type S pistons it's really hard to get the exact #'s on what my CR will be so this is good info to have. :TU:
you could always CC the head, then the piston and know for certain
 

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Brokedick Millionaire
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40,226 Posts
cranking psi cannot give you any info on the compression ratio.

Lets see, same motor, same cam and everything.

Test 1 = 175-180
Test 2 = 195-200
Test 3 = 155-160

Test 3 made the most power.

Wanna guess what I did?
 

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FF Misfit
Joined
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4,881 Posts
cranking psi cannot give you any info on the compression ratio.

Lets see, same motor, same cam and everything.

Test 1 = 175-180
Test 2 = 195-200
Test 3 = 155-160

Test 3 made the most power.

Wanna guess what I did?
Did you put oil in the cylinders?
 
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