So what is a marine WOT definition, now?
I recently purchased an older SR with (2) 383 carbureted stroker motors and Bravo 1 drives. Boat is a 270 Amberjack. During sea Trial with three adults and a full fuel tank of 150+ gal of gas, owner got motors to 6300 RPMs. The MCs motors/throttle levers would NOT go any faster/forward, but GPS indicated 48 MPH. My years of boating experience indicates that the props (SS Mirage) are not pitched correctly and should be re-pitched so that boats runs about 5000 RPMs (max), if boat?s throttle arms are pushed as far forward as possible.
Back in the day, each inch of pitched added or reduced from prop, usually meant an increase or decrease of 200 RPMS on motors.
Older STD 350 (5.7) Chevy carbureted MCs were generally propped to 4200-4400 RPMs with a load on them/boat. But, few boaters ever ran their motors at those RPMS.
A buddy disagrees. He indicated that WOT is the maximum SUSTAINED RPMs (5000) but boat can do very much faster, and in this case 6300 RPMS.
To me WOT means that the motors/boat/weight combination will not go faster than a prescribed RPM when throttle levers are all the way forward.
Perhaps terminology has changed or I was incorrect in my earlier assumptions. Or, he and I are both using incorrect terminology?
Props are counter rotating and cupped. Do I need to add pitch in props and how much?
I recently purchased an older SR with (2) 383 carbureted stroker motors and Bravo 1 drives. Boat is a 270 Amberjack. During sea Trial with three adults and a full fuel tank of 150+ gal of gas, owner got motors to 6300 RPMs. The MCs motors/throttle levers would NOT go any faster/forward, but GPS indicated 48 MPH. My years of boating experience indicates that the props (SS Mirage) are not pitched correctly and should be re-pitched so that boats runs about 5000 RPMs (max), if boat?s throttle arms are pushed as far forward as possible.
Back in the day, each inch of pitched added or reduced from prop, usually meant an increase or decrease of 200 RPMS on motors.
Older STD 350 (5.7) Chevy carbureted MCs were generally propped to 4200-4400 RPMs with a load on them/boat. But, few boaters ever ran their motors at those RPMS.
A buddy disagrees. He indicated that WOT is the maximum SUSTAINED RPMs (5000) but boat can do very much faster, and in this case 6300 RPMS.
To me WOT means that the motors/boat/weight combination will not go faster than a prescribed RPM when throttle levers are all the way forward.
Perhaps terminology has changed or I was incorrect in my earlier assumptions. Or, he and I are both using incorrect terminology?
Props are counter rotating and cupped. Do I need to add pitch in props and how much?