Engine CR Calculator

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					                                                ENGINE CALCULATION SHEET
                                                                By Longboy74
                     (Note: Values need to be entered into all of the Orange boxes to get an accurate result.)
                     (Due to manufacturer tolerances, results may vary. Use at own risk - Hint: measure everything tw

                     Number of Cylinders       4                 Bore diameter
                                                                   80.98 mm            Piston Combustion chamber vol
                 Cylinder Head Volume         0.5     cc                                   36

       Block shave      0     mm


       Head gasket     1.25   mm


Compression height    44.25 mm




      Block height    208.5 mm

     After Shave =     208.5 mm




                     RESULTS

       DECK HEIGHT @ PISTON TDC =             0.69    mm from top of block

         CYLINDER VOLUME AT TDC =             3.56    CC

               CYLINDER CAPACITY =          399.78    CC

                     ENGINE CAPACITY =      1599.11   CC

               COMPRESSION RATIO =            9.60    :1
Cranking pressure = Between   157   psi and   194   psi


                                                          Throw weight




                                                                         Rod Ratio
boxes to get an accurate result.)
at own risk - Hint: measure everything twice :))


          Piston Combustion chamber volume
                    cc                                                           VALVE GEAR

                                                            Valve diameter            38.5    mm




                                                               Rocker ratio           1.5     :1
                                Rod length
                                 124.75 mm                           cam lift          7      mm

                                                                    Valve lift        10.5    mm

                                                     Lift v's Valve diameter          27.3    %




                                Crank stroke
                                  77.62 mm                                  HEAD GASKET =          6.45      CC

                                          mm
                                                                            BLOCK SHAVE =          0.00      CC




                                                                          QUICK CALCULATOR


                                                   INCHES TO MM                               MM TO INCHES
                                                           0.485                 "                124.75     mm

                                                           12.319                mm                4.911     "
     PISTON AND CONROD WEIGHT COMPARISON
             Conrod Piston
Throw weight   680    460         1140     g
               680    600         1280     g

                  Difference      140      grams



          Rod Ratio   1.607

				
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