Compression Calculator This calculator is intended for use as a general estimate of your compression only. Certain variables that cannot be accounted for may cause the actual compression ratio to vary - such as a head that has been milled. Please use your own discretion. Default values have been provided for your convenience. You can enter your own custom values in the edit boxes below to match your personal setup as needed.

Block D15B7 D16A6 D16Z6 D16Y8 ZC Other Bore (mm) Stroke (mm) Head D15B7 - D16A6 D16Z6 D16Y8 ZC Other Combustion Chamber Volume (cc per cylinder) Piston PM3 (USDM D15B7) P07-010 (USDM D15Z1) PM6 USDM (D16A6) P2E-000 (USDM D16Y7) P28-A01 (USDM D16Z6) P2M-00 (USDM D16Y5) P2P (USDM D16Y8) PDN-A00 (USDM 98-00 GX) PM7 (JDM ZC) PMS-A00 (USDM 01-03 GX) P29 (USDM D16A1) Other Piston Dome Displacement (cc per piston) Head gasket Thickness D15B7 - D16A6  D16Y8 - D16Z6  D16Y8 2 - layer Other Thickness (in) * Bore difference (mm) [Gasket Bore - Cylinder Bore] Piston-to-Deck Height OEM D15B7 D16A6 OEM D16Y8 OEM D16Z6 OEM ZC Other Height (in)                 1mm = 0.03937 in [negative value = out of the hole]

COMPRESSION RATIO : 1cr Displacement cc                        Piston Specs   Total Height (mm) Compression Height (mm) Dish / Dome (mm) PM3 61.76 30.70 Flat Top P07 57.65 27.75 7.05 Dish PM6   29.5   P2E 50.00 30.00 3.32 Dish P28 60.00 30.00 3.00 Dish P2M 49.26 29.5 2.70 Dish P2P 49.25 29.5 2.12 Dish PDN 49.28 29.50 2.50 Dome PM7   29   PMS 47.42 27.00 1.50 Dome P29   29   Piston Deck Clearance Formula Deck Height - Compression Height - Rod Length - Stroke/2 = Piston Deck Clearance Rods Engine Stroke Rod Length Rod: Stroke Ratio Deck Height D16A1,A6,Z6,Y5,Y7,Y8 90mm 137mm 1.52 212mm D15B1,B2,B8,B7 84.5mm 134mm 1.59   D15Z1 84.5mm 137mm 1.62

* It is not necessary to do so, however for slightly better results, enter the difference between the bore diameter of the head gasket in use and the actual cylinder bore to increase accuracy of the calculations. (i.e. Actual cylinder bore may be 81.50mm whereas the head gasket bore is 82.00mm, therefore there is a difference of 0.50mm - enter this value into the edit box) Otherwise leave it at the default value 0.00