Prop Rating Horse Power

[claywake]

I have a 1985 Merc 150, does anybody know when the change was for rating horsepower at the prop, from powerhead??

 

[Spidybot]

Re: Prop Rating Horse Power

In late 80's JohhnyRude's brochures states both. Can't say for Mercs, but any dealer would know.

 

[sho305]

Re: Prop Rating Horse Power

About the time the I6 140hp turned into a 115hp. Maybe late 70s to 1982 I have heard for Merc. My '73 150 I6 runs about 120hp on the prop calculators and about the same as 115's. I tweaked it a little, more timing, etc. It is hard to find like hulls to compare though. I have a 17' Checkmate vee hull with no pad and run 54mph. My speedo is one year old and runs slower than any other boat/jetski I race by 2mph or more. Not found a GPS yet.

 

[claywake]

Re: Prop Rating Horse Power

My boat is an old Reinell around a 1976 year, 17 foot.With no one in the boat but me she will do 55, all trimed up , my dealer says 1985 was the switch from powerhead to prop rating, my motor is a 1985 150 Merc. I am new to outboards, I had a 17 foot swiftsure with a Merc 470 in it, it would do 44 miles per hr.

 

[claywake]

Re: Prop Rating Horse Power

Oh yea this is with a speedo, not GPS..