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Displacement for various combinations of bore and stroke
Several recent threads have involved different combinations of bore and stroke and the effect of increasing the bore above stock. As penance for copying bad data from a vendor site to this forum I submit the following table summarizing the displacement of all combinations of crankshaft and piston offered by Magnus and Brian Crower. The rod lengths were calculated to fit the blocks and some may be custom lengths. All listed piston sizes are available but stroker versions with the higher pin may be custom on some sizes. As a crude measure of maximum RPM capability the last column is the RPM for the same peak piston acceleration as the stock 2.0L at 8000 RPM.
Note that peak piston acceleration is only one measure of the ability of an engine to Rev.
The 2.6L (2.579) engine with a 106mm stroke and 88mm bore will reach a mach number of 0.51 through the valves at 6195 RPM compared to 8000 RPM for the stock 2.0L. Above 0.5 mach through the valves, power starts dropping off until the sonic wall is hit at about 0.6 mach.
The ‘+’ or ‘*’ symbols indicate either stock pin location on the piston or raised 6mm as in the stroker pistons.
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