Crank vs. rear wheel

not sure what you mean but the diference between NET and GROSS hp is around 5% for any engine prior to 1972.

I guess this gest tp the point - A-Bomb seems to think that losses through accesories to achieve an SAE rating is only around 5%

2Darts and DGC seem to think its closer to 16% ?

(Correct me if I'm reading anyone wrong - I'd hate to attract another "stalker" ! LOL!)