power loss thru lower unit

lindsey

Cadet
Joined
Nov 22, 2009
Messages
26
I have a 1973 rude 85 hp motor. I was wondering how much power is actually at the prop since in 1973 they rated them at the flywheel
 

steelespike

Supreme Mariner
Joined
Apr 26, 2002
Messages
19,069
Re: power loss thru lower unit

I feel that if the motor is sound and well tuned you won't be able to tell the difference without a speedo.
 

Frank Acampora

Supreme Mariner
Joined
Jan 19, 2007
Messages
12,004
Re: power loss thru lower unit

You can figure the water pump absorbs about 15 HP. The gears themselves are very efficient and will absorb only 1-2%. Seals would probably take another 1%
 
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