Quote:
Originally Posted by BigMike
I have a 1979 V-20 ...I repowered it from an I/O to a Gil Bracket with floatation... Installed a 1988 Johnson 140HP VRO Looper .....It has a 13 1/4" X 17P aluminum prop on it, Cavitation plate is 2 1/2" above the bottom of hull... My V-20 is heavier than most with lots of gear and fishing equiptment and a hard top... Motor runs great but seems to have way to much prop on it the tach was broken. . I just installed a new tach.....I'm wondering if anyone can recomend a starting point for prop size I'm thinking 13 1/4 X 15p or even a 14p.....
|
What is your WOT reading on the new tach? By "too much prop" I take it you think the motor is not reaching it's proper RPM @ WOT? If that's the case I'd keep the same dia if possible and drop to a 15p prop for starters.. Dial in the pitch first, then fine tune with different diameters if necessary. IMHO
__________________
1987 V20 w/1987 150HP Yamaha on a Shoreland'r Trailer
1978 16.5 Airslot w/1996 120HP Force on a Four Winns trailer
1996 V21 w/1993 200HP Mercury on a Shoreline Trailer
All towed by a 5.7L Hemi Durango.
If God didn't have a purpose for us we wouldn't be here, so
Live simply, Love generously, Care deeply, Speak kindly.
(Leave the rest to God) 
Silence, in the face of evil, is itself evil. Not to speak is to speak, not to act is to act. God will not hold us guiltless.
|