318/392 Stroker Motors

[barefoot99]

Blue Sky back in the water, port engine repaired. Mechanic ran it she turned 4100 rpm with throttle left, not sure on the speed. New bottom paint and the 4 blade props installed. She is pretty stripped presently. Give me few days to sort out minor issues and will post engine rpm/speed numbers.

[Trowerpower]

So full of water, eisenglass, full of fuel, curtains all the stuff 26mph at 4,000 rpm. Clean bottom.

[Trowerpower]

1600rpm 10mph, 3,000rpm 20mph.

[Fastjeff]

Sounds to me that you need a lot more prop! My 32 footer did 20 mph at 2,500 rpm (and still leapt out of the water).

More prop equals better mpg and less engine wear.

Jeff

[pbaker32s]

What props are you using ? I have 16x16 3 blades as came factory. I can never remember the speeds /rpm‘s so I took some pictures this weekend . 7 people aboard full tanks top on.
I have seen 34 mph. Around 4200 rpm’s

[Trowerpower]

Presently 15 x 14.25 four blade props. I believe it is under propped slightly. I am having the original props reconditioned. I still working with Delta Propeller for a different set.

[Fastjeff]

Whoa! You're way under propped. My stock 360s (32 footer) were happy with 17 x 15 4 bladers.

More power means lots better gas mileage and less engine wear as well. The boat still rocked out of the water with them, turning 3,900 rpm WOT.

Jeff

[Trowerpower]

Okay, went to Delta Propeller in Cleves, Ohio today to pick up my stock three blade props after reconditioning. They look like new. They want to add .90 pitch to my 4 blade props, now i just need to switch them. I know a diver. Stay tuned.

[Trowerpower]

Prop swap will have to wait until next spring, winterized the boat yesterday. Put about 40 hours on the motors this season. They are starting and running great, maintaining a consistent engine temperature. Since rebuild they have 308 hours on them.