Prop for 1988 Force 85hp

[juryj]

I recently purchased a 1988 Bayliner Capri with a 1988 85hp Force. I desperatly need a new prop. The prop I took off of the motor is a 13 1/2Dia. with a 17 pitch, the book calls for a 13 Dia. with a 19 pitch. (both 3 blade) How do I find out which prop is the right prop for me?

 

[roscoe]

Re: Prop for 1988 Force 85hp

The lower pitch prop that was on the boat will give you a better holeshot and more pulling power for skiing. It will also allow engine to run at slightly higher rpm.<br /><br />The right prop is the one that allows the engine to run near maximun rpm, 5200, at wide open throttle.<br /><br />If you lower the pitch one inch, the engine will go about 200 rpm faster. So if you lowered the pitch 6 inches, the rpm would increase 1200, putting your engine into danger, it would soon fail.<br /><br />If your engine was opperating within the 4800 to 5200 rpm range, I would replace prop with the same pitch.<br /><br />Props for these engines are getting hard to come by, so don't expect a bargain.