82' rude, crankshaft rated hp. or prop rated hp.?

[bob-o p]

crank rated or prop rated:<br /><br />1993 force 70 hp<br />1982 rude 75 hp<br /><br />the reason why i ask is i have the force, and it blew up and i'm thinking of buying the rude but i was wondering if they are rated the same, or one crank rated and one prop rated. i didn't know if the 82 rude is acually not as powerful as the 93 force?

 

[radsrh]

Re: 82' rude, crankshaft rated hp. or prop rated hp.?

The 93 Force was definitely prop rated, I believe the 82 Rude was still crank rated I think the change was in the mid 80's. Depending on how many hours the Rude has it will also be getting tired from it's age, the older they get they loose compression ect and will loose power.

 

[alcan]

Re: 82' rude, crankshaft rated hp. or prop rated hp.?

Hi Bob<br /> And what does all this really mean to us average boaters/fishermen? Not a darn thing. If you buy a used motor, I don't care how old,and it's in good running condition, you'll get acceptable performance.

 

[bob-o p]

Re: 82' rude, crankshaft rated hp. or prop rated hp.?

i wanted to know if the 82 was crank rated or prop rated,(i was pretty sure bout my force)but not the rude that's all i was asking

 

[dick]

Re: 82' rude, crankshaft rated hp. or prop rated hp.?

Might be wrong but I thought the change from p/h to p/s was in 1984.

 

[Forktail]

Re: 82' rude, crankshaft rated hp. or prop rated hp.?

ICOMIA Standard 28-83 declares measurement standards for propulsion engines, which includes the prop shaft horsepower standard.<br /><br />ICOMIA standards are strictly voluntary for the industry (not held by law). 28-83 was established in 1983 (thus the -83 in the standard identification). All the leading manufacturers have adopted ICOMIA 28-83, but exactly when they did this can only be answered by the manufacturer. Some did it prior and some after the standard was published. 1982 is borderline, and I suggest calling Evinrude (Bombardier) to make certain. Although I'm guessing Evinrude used propshaft in 1982. <br /><br />FWIW, the difference in actual power between a 70 hp prop shaft rated outboard and a 75 hp flywheel rated outboard will be hardly noticable. Expect a 3-5% loss through the gear reduction, lubrication, and bearings of the lower unit.