Pro Stock: NHRA vs IHRA (1 Viewer)

The big motors are less efficient but I'd probably stay in the stands to watch them.

I remember Darin Morgan saying a while back that the 800inch engines are the equivilant to trying to run a 400 SBC with something like 1.5" intake valves. :eek: He also said that at the speed they're turning them (which isn't nearly as high as the 500 inchers) the piston is trying to outrun the flame-front. One other thing he said is that those mountain motors have the highest piston speed of any racing engine because of the huge crank stroke.
 
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