bigbluebirdy
Seaman
- Joined
- Mar 11, 2002
- Messages
- 60
Hi folks,<br /><br />I run a 14 1/2" by 17 pitch Mercury prop on my '85 Mercury Black Max 150hp. It's the V6 with th 4 3/4" gearcase. My 20' Wellcraft Sport runs at about 5800-5900 RPM's at WOT. Is this too high? Does anybody know what the maximum range is for this motor? If not, I'll call Mercury I guess. Waiting for the op's manual! Also, I'm thinking of moving to a cupped prop. I know cupped will drop the rpm's, but if my rpm's drop from 5800 to 5600<br />how much top speed will I lose? Should I change the pitch also? I know there are alot of variables here and no boat is the same, but any input would be appreciated.<br /><br />Thanks,<br />Chris