Hi Folks,
I have a question about Prop Pitch.
We just bought a 1985 SunRunner 310SB. The boat weighs in at 9300lbs dry. can carry 150 gallons of fuel. It is a Deep Vee hull with flat stabilizing chines. It is powered by 2 AQ260/AQ290 units. I believe they are 305 chevy small blocks. The engines were reported to have been rebuilt 2 years ago, but the boat had not been used much so the original hours must be close at 210/217 hours.
The engines run great. According to the previous owner, when he took it out, he claimed he could not get it over 3500 rpms even on plane. It has Bennetts on it, but don't know if he used them.
He said he thought the problem was the carburetors needed tuning. Then he lost the port outdrive propulsion and sold the boat.
When we picked it up, the outdrives were badly barnacled up and the reverse lock on the port drive prevented proper transmission engagement on the port side. I have picked up two Fresh water outdrives to replace those old beatup units.
Here is my question:
The props on the boat are 15" x 19" props. both right-hand. Transmissions are setup to spin opposite. If the Props are not original, as I suspect, would it make sense to think the boat is over-propped and get a set of 15"x17" props for it?
I think I read somewhere that these units should run WOT at around 4500 to 4800rpm?
Any thoughts or recommendations?
Thanks,
Kevin
I have a question about Prop Pitch.
We just bought a 1985 SunRunner 310SB. The boat weighs in at 9300lbs dry. can carry 150 gallons of fuel. It is a Deep Vee hull with flat stabilizing chines. It is powered by 2 AQ260/AQ290 units. I believe they are 305 chevy small blocks. The engines were reported to have been rebuilt 2 years ago, but the boat had not been used much so the original hours must be close at 210/217 hours.
The engines run great. According to the previous owner, when he took it out, he claimed he could not get it over 3500 rpms even on plane. It has Bennetts on it, but don't know if he used them.
He said he thought the problem was the carburetors needed tuning. Then he lost the port outdrive propulsion and sold the boat.
When we picked it up, the outdrives were badly barnacled up and the reverse lock on the port drive prevented proper transmission engagement on the port side. I have picked up two Fresh water outdrives to replace those old beatup units.
Here is my question:
The props on the boat are 15" x 19" props. both right-hand. Transmissions are setup to spin opposite. If the Props are not original, as I suspect, would it make sense to think the boat is over-propped and get a set of 15"x17" props for it?
I think I read somewhere that these units should run WOT at around 4500 to 4800rpm?
Any thoughts or recommendations?
Thanks,
Kevin
