The few times over the years that I have seen both a Pantera's crankshaft & rear wheel bhp numbers published together, the difference suprisingly always computed to 19%. I tend to round that off to 20% as a fudge factor.
Any additional weight added anywhere in the drive train will create a greater difference; i.e. heaveir wheels or tires, heavier axles, heavier half shafts.
cowboy from hell
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