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# how to calculate compression ratio

Discussion in 'Members' Lounge' started by reckedracing, Dec 16, 2004.

1. ### reckedracingTTIWWOPVIP

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4 cyl
2.2 liter displacement
225 psi compression test...

anyone know how to calculate the CR?

its a 2001 H22A4, but a motor builder told my friend he had 11:1 compression which would be a typeS...

2. ### pissedoffsolRETIRED

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bullshit. theres not direct number coorelation.

10.6:1 vs 11:1 is negliable at ebst

3. ### brian11to1Senior Member

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Im confused.... help meh

4. ### B16Super ModeratorVIP

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i get 280psi on 1.8L b18cR with 12.3:1 pistons. but you cannot get your CR from a compression test.

5. ### JDMilanSenior Member

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cspeed

6. ### phunky.buddhaAdmin with a big stickAdminVIP

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My cheapo 300psi gauge is pegged after 4 pumps....

7. ### B16Super ModeratorVIP

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mine maxes at 300psi also

8. ### hcivic.comSenior Member

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the only real way is to cc the block and head if youve got it apart it takes 10 mins to do

9. ### phunky.buddhaAdmin with a big stickAdminVIP

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10. ### Slammed90LudeSenior Member

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the water method owns

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