Isn't that amazing? That is exactly why when we Bomb guys switch to a 520 pitch chain why we actually pick up rwhp. Crank hp doesn't change a bit. There is internal rotating mass (piston, crank, flywheel, etc.) There is external rotating mass (tires, chain, sprockets, hubs, axle, etc) Finally there is load put on the motor by surface conditions which are effected by traction and as you mentioned there is also wind resistance put on vehicles (especially very high speed ones) that put load on the motor......i.e. drag coefficient.

Remember when the Chrysler Crossfire came into production? It had the same motor, tranny, gearing and approximate weight as the Mercedes SLC320 (I believe that is the correct model.)

The only difference was the Crossfire had 18 inch wheels with lower profile tires and I believe the Mercedes had 16 inch wheels with higher profile tires. The Mercedes would pull the Crossfire by almost a second in the quarter and 3 or 4 tenths to 60. They attributed the difference to the unsprung weight of the larger diameter wheels. It didn't effect trap speed in the quarter as much as it did E.T., which means the additional rotating mass effected acceleration more in the early part of the rpm band when torque numbers were the lowest.

I have to get some sleep. Thanks for the exercise Gene[img]i/expressions/face-icon-small-smile.gif[/img]

Ron

 

stock shee is from 37 to 42 hp at 7000 rpm,depending on year models

 

hey, ron. thnx for the info.