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PR3 pistons in a B18C GSR

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

  1. gazzar

    gazzar New 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. K2e2vin

    K2e2vin Senior Member

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    That's not how you measure compression ratio.
     
  3. gazzar

    gazzar New Member

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    so how do u measure it then
     
  4. Slow&Delirious

    Slow&Delirious isn'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
    Deck Clearance + Head Gasket + Combustion Chamber Volume
     
    Last edited: Oct 21, 2009
  5. Slow&Delirious

    Slow&Delirious isn'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
    Bore x Bore x Head Gasket Thickness x .7854 = Gasket Volume = V3
    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. caboose

    caboose USDM to the bone

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    shouldn't that equation include piston dome/dish
     
  7. Briansol

    Briansol Admins Admin VIP

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    dome/dish is part of combustion chamber cc's
     
  8. caboose

    caboose USDM 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

    G = Gasket Volume

    CC = Combustion Chamber Volume
     
  9. Fernpatch

    Fernpatch Member

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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. crxpower24

    crxpower24 Member

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    wait wat so wats the normal compresion for b18c
     
  11. LifeSucks88

    LifeSucks88 New Member

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