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Prop for 90 HP Merk

It has been my experience that higher Rpm's within reason are a lot better for an engine that lugging it down. We rebuild a lot of motors that have had too big of a prop with ceased rings. Engines run at higher Rpm's stay cleaner. You can run your engine at 7,000 - 8,000 Rpm's safely.

The 500 Rpm difference you mention is if no significance.

Don Dando

 Don
Sep 1
2006
Don, when you reply to posts use the "Reply Group" button instead of the new post button. The "New Post" button starts a new discussion thread so your comments sometimes might get missed in the discussion.

As far as the 7-8,000 rpm if the motor is rated 90 hp at 5500 rpm and the other Merc motors of that similar size are rated at 5000 rpm I would not be willing to take the financial risk of overrevving a motor that much. (This is my first big OB motor).

I think it's similar to the fact that a SB Chevy V-8 can be built to safely rev to 9,000 rpms or more but you wouldn' want to take a stock Chevy SB and do that, it would probably self destruct at around 7500 - 8000 rpm if the computer would allow it to go that high. most stop at around 5500-6250 max.

Fredo

FREDO
Sep 1
   
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