Horse Power

[stickerhard]

I have a 1979 80 merc thats been a great motor but I was thinking of up grading.My question is if I buy a late 1990-1995 90 hp merc will I be gaining much as far as hp out the prop compared to the old 80hp?

 

[Gomer50]

Re: Horse Power

To the best of my knowledge 1979 hp was rated as bhp (brake Horse Power) and not sure but somewhere in the 80's I think outboards changed to shp (shaft horse power) so your 80hp would probably be in the neighborhood of about 72 hp (SHP) versa a 1995 90hp motor 90hp = 18hp gain..

 

[stickerhard]

Re: Horse Power

I didnt know when they changes the rating . Thank you very much for the responce.

 

[Mi duckdown]

Re: Horse Power

Stickerhard. it was 79 or 80 when they changed the rating. not sure better, Google something or call Merc in Fond Du lac
with out a serial numbers you Will be chasing your tail.

 

[Lawnmedic]

Re: Horse Power

My 1987 was still Crankshaft rated... I think around 1989-90 was the change.

 

[79Merc80]

Re: Horse Power

I heard it was 82/83