merc prop

tbjtib

Seaman Apprentice
Joined
Apr 3, 2002
Messages
31
Hi,I have a 81 inline six 90 hp merc. The prop is 13x19 The rpms tops out at 5400,the book says 5000 should be max. Would it be better to up the pitch or stay off the thottle a little? Thanks,Timb
 

rickdb1boat

Supreme Mariner
Joined
Jan 23, 2002
Messages
11,195
Re: merc prop

What size and type boat are you running? What is the main use of the boat?(Sking, fishing, Ect) You are probably close with the prop you have, but it wouldn't hurt to stay out of it a bit, especially avoiding long periods using full throttle. You will sacrifice hole shot if you go up in pitch, but then again you may get better top end speed and stay within the recommended RPM range.
 
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