I/O Performance Advise

[Blue_Heron]

Originally Posted by FishStretcher

So the drive ratio on my bravo 3 is on a sticker- and it is bleeding away at that. it makes me wonder if yours might be a 1:2.0 labelled as a 1:1.65?

BTW, I have a 1:2.20 on a 350 MAG MPI bravo 3 at 22" pitch both props on the counter rotating pair. It would seem that 26" pitch is ambitious for your setup.

Bravo 1 drive ratio info here:

http://www.go-fast.com/sterndrive_gear_ratios.htm

It's a reduction gear ratio, so the higher the number, the lower the prop rpm compared to engine rpm. I think the diesels usually run the 1:1.36 ratio. I checked again and mine is a 1:1.50.

The Bravo 3 ratios are higher because the counter rotating props are more efficient even when turning a high pitch prop at a lower rpm.

Dave