Lots of great info here on the Forum. looking forward to helping and getting info.

I've seen a lot of boaters be very focused on the Marine engine RPM range, and Max RPM.

I appreciate that there are considerations for the engine's power curve etc, as well as the cam profile putting the engine in an efficient operating range for WOT. Also valvetrain considerations.

My thought is that an Alpha 1, Bravo 1, OMC Cobra, Volvo SX, and the Volvo 200 series ( 270-280-290), would reliably take more HP and TQ at an RPM range 5000-6000. Vs a Max of say 4600 RPM.

A few factors involved:

1. The Prop RPM needs to be accounted for.
2. An extra 1000 RPM at that level should not be an issue. Prop getting out of the water and spinning up may be a factor.
3. The Tq getting transferred through the drive at a higher RPM will will be lower, to achieve a higher or same HP. Meaning less overall strain on the drive.

Looking to get some conversation going, but wanting to focus on the drives, and their Power and RPM capacities.

Engines can be built to operate at a more efficient RPM, where they also can produce power that is easier on them. Obviously, as you climb up the RPM, the engines will begin to have wear due to RPM.

I suspect that a propped boat with a higher Max RPM, say 5500, would also give a better bottom end performance, and hole shot. essentially, Not putting the engine into overdrive.


Thoughts?

I used to have a Ford 302 putting out 500+ HP and I could snap my Alpha SS drive at will if I got stupid.
They will take the RPM - they won't take any real torque.
convert to a Bravo style drive. You will be money ahead.