# PR3 pistons in a B18C GSR

Discussion in 'Integra' started by gazzar, Oct 21, 2009.

1. ### gazzarNew Member

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i have a B18C engine and i put a set of PR3 pistons with new ring pistons. the compression ratio was 210 psi. is that bad or good

2. ### K2e2vinSenior Member

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That's not how you measure compression ratio.

3. ### gazzarNew Member

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so how do u measure it then

4. ### Slow&Deliriousisn't fast or furious

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volume at TDC vs Volume at BDC
Cyl Volume + Deck Clearance Volume + Head Gasket + Combustion Chamber Volume
Divided By

Last edited: Oct 21, 2009
5. ### Slow&Deliriousisn't fast or furious

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OR

Bore x Bore x Stroke x .7854 = Cylinder Volume = V1
Bore x Bore x Deck Clearance x .7854 =Clearance Volume = V2
Combustion Chamber CC's x .061 = Combustion Chamber CI = V4

V1 + V2 + V3 + V4
---------------------
V2 + V3 + V4

But 210 psi sounds like a good reading for a honda engine, mine is like 140 psi and it runs allight

6. ### cabooseUSDM to the bone

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shouldn't that equation include piston dome/dish

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dome/dish is part of combustion chamber cc's

8. ### cabooseUSDM to the bone

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The calculation for determiningcompression ratio works out likethis:

CR=(D + PV + DC + G + CC) / (PV + DC + G + CC)

CR = Compression Ratio

D = Displacement

PV = Piston Volume

DC = Deck Clearance Volume

CC = Combustion Chamber Volume

9. ### FernpatchMember

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Assuming your engine is otherwise stock your C/R should be about 11.3:1. 210 psi on a compression test is fairly decent. have you checked all 4 cylinders to see how close they are?

10. ### crxpower24Member

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wait wat so wats the normal compresion for b18c

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