Crank/prop HP ratings of Force

[Mark42]

I am shopping around for a motor to replace an 1985 85 hp Force. Wondering if that year the hp was rated at the crankshaft, or at the prop shaft?

If it was rated at the prop shaft, then a 1990's 70 hp Johnson in top condition should give equal performance, no? (that is assuming about a 15% hp loss to the prop)

 

[Frank Acampora]

Re: Crank/prop HP ratings of Force

It was around 1982 that ALL outboard manufacturers changed to prop rating. SO: Any Force engine is rated at the prop! The main problem was the regressive gearing in the lower unit so Force engines, while rated at the prop, did not deliver the horsepower into the water the same as other brands. Yeah, Yeah! I know: Horsepower is horsepower, is horsepower-----NOT!

Depending upon your hull and the 70 rude condition, it may or may not equal the performance of the Force.

 

[jerryjerry05]

Re: Crank/prop HP ratings of Force

The Forces made in the 80's and early 90's.The ones that say 85 hp were actually a 90hp The 90's are a90hp.
The 125hp was closer to a 120.Thus the change.J

 

[Mark42]

Re: Crank/prop HP ratings of Force

The Forces made in the 80's and early 90's.The ones that say 85 hp were actually a 90hp The 90's are a90hp.
The 125hp was closer to a 120.Thus the change.J

Where did you get that info from? Just wondering because it is in conflict with what is in my service manuals.

Thanks!