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Author Topic:   Actual vs stated HP for outboards

Kelly posted 06-29-2001 11:34 PM ET (US)
I know that there is some variation in the actual HP and the designation on the motor, but has anyone ever seen any kind of publication of this information? I have this very unfounded and unscientific impression that Yamaha outboards are very close and possibly slightly under the number on the motor, and that for Mercury, the actual is probably a higher than the motor's designation. The reason I ask the question is that I am kinda hoping Yamaha comes out with a 4 stroke in the 70 hp range that is more the size of the 50. I know they have the 80 but it is based on the 100 and is toooo heavy for a 80hp. If the mercury 60 hp 4 stroke is really an actual 66, then the 60 may be just about as good as a Yamaha 70 that is really a 68,69, or 70. I don't think I could tell the difference.
By the way, talked to a Yamaha dealer about Yamaha and a new 4 stroke 70 hp or there abouts motor, and he said that right now Yamaha is thinking that they will come out with a 60 hp 4 stroke and probably a 70-75 hp 4 stroke to replace the 80 4 stroke. If it is lighter, I think that would be a great motor for the 17'. What do you think? Kelly
jimh posted 06-29-2001 11:49 PM ET (US)
http://continuouswave.com/ubb/Forum4/HTML/000284.html discusses horsepower ratings.
Whaletosh posted 06-30-2001 07:19 AM ET (US)
As far as the Mercury 60 4-stroke goes it is a retuned 50. Outboard specs are allowed a 10% leway in stated HP. So if mercury was able to retune the 50 to give 55 HP reliably they could rebadge it as a 60 HP legally.
I have one of these and so far it has been great. Mine is on a Dauntless 14, and i get 35 MPH (statute), and can cruise nicely at 30 MPH. plenty fast enough for me.

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Author	Topic: Actual vs stated HP for outboards
Kelly	posted 06-29-2001 11:34 PM ET (US) I know that there is some variation in the actual HP and the designation on the motor, but has anyone ever seen any kind of publication of this information? I have this very unfounded and unscientific impression that Yamaha outboards are very close and possibly slightly under the number on the motor, and that for Mercury, the actual is probably a higher than the motor's designation. The reason I ask the question is that I am kinda hoping Yamaha comes out with a 4 stroke in the 70 hp range that is more the size of the 50. I know they have the 80 but it is based on the 100 and is toooo heavy for a 80hp. If the mercury 60 hp 4 stroke is really an actual 66, then the 60 may be just about as good as a Yamaha 70 that is really a 68,69, or 70. I don't think I could tell the difference. By the way, talked to a Yamaha dealer about Yamaha and a new 4 stroke 70 hp or there abouts motor, and he said that right now Yamaha is thinking that they will come out with a 60 hp 4 stroke and probably a 70-75 hp 4 stroke to replace the 80 4 stroke. If it is lighter, I think that would be a great motor for the 17'. What do you think? Kelly
jimh	posted 06-29-2001 11:49 PM ET (US) http://continuouswave.com/ubb/Forum4/HTML/000284.html discusses horsepower ratings.
Whaletosh	posted 06-30-2001 07:19 AM ET (US) As far as the Mercury 60 4-stroke goes it is a retuned 50. Outboard specs are allowed a 10% leway in stated HP. So if mercury was able to retune the 50 to give 55 HP reliably they could rebadge it as a 60 HP legally. I have one of these and so far it has been great. Mine is on a Dauntless 14, and i get 35 MPH (statute), and can cruise nicely at 30 MPH. plenty fast enough for me.