Prop Shaft H.P.

[boxscore]

How much HP is typically lost from the motor to the drive. Merc's HP525 is rated at 500 at the prop... what would this motor actually be dynoed at?

[Havasu Hangin']

boxscore:
How much HP is typically lost from the motor to the drive.I've heard 25 HP on the B1...25 more on the XZ...more on the #6 cuz of the trans.
I could be wrong.

[BADBLOWN572]

It depends mostly on the drive. I have heard #'s approximately:
Bravo 1: 25hp
B-Max: 75-100hp.
#6 dry sump: 35hp (w/o tranny)
#6 wet sump: 85hp (w/o tranny)
not sure of Imco's

[Havasu Cig]

I think the 500 EFI makes 500 hp at the crank but is rated at 470 psh on the B-1. Not sure about the XR.

[Cole]

holly crap....75-100hp with the B-max!! eek!
what about the XR drive? Cole

[dcb carrera]

I heard you lost 15% at every turn so add 30% so 611 hp at engine for hp500. Not sure about this but thought I would throw it in the mix.