prop help

[grizz]

I;m building a donzi 20 hull 2900 lbs 383 motor 425 hp 450 touque 5400 rpm drive 1.61 what prop 25 26? thanks

[Menace Marine]

What drive? Alpha 1. Guessing based on gear ratio. A 25 p or so prop is a decent place to start. How stuck are you with that gear ratio? I only ask because if you could switch to a 1:47 ratio you could run a lower pitch prop at the same speed. The lower pitch prop will have less leverage on the drive and allow it to live longer.

[grizz]

It is a volvo cobra drive the boat had a 21 pitch 305 motor 52 mph I;m thinking this 383 at 5400













I;t has volvo corba 21 pitch prop 305 52 mph so I guessing 383 gaining 100hp should spin a25or 26 I would like to start big so I load the motor then back up if I have to. I;m going to take your advise and look into ratio change. volvo has quick change gear ratio I.m putting drive shower on also. thanks also going from 3 blade 4.

[Paul65K]

I have a completely blueprinted and balanced 25 3 blade that I bought for my Donzi and never put it on the boat before I sold it. If you are interested let me know I'll make you a killer deal.....actually I have both a 23 & 25 that I never put on.....they won't work with my current boats and I just pulled them out of the closet today when I was doing some straightening up inthe garage.

Paul

[grizz]

I have a completely blueprinted and balanced 25 3 blade that I bought for my Donzi and never put it on the boat before I sold it. If you are interested let me know I'll make you a killer deal.....actually I have both a 23 & 25 that I never put on.....they won't work with my current boats and I just pulled them out of the closet today when I was doing some straightening up inthe garage.

Paul

Paul do know if it is 19 spline for volvo penta I;m interested in the 25 thanks clayton e mail clayton.ingmire@yahoo.com

[grizz]

let me know if the 25 is 19 spline for volvo penta e mail clayton.ingmire@yahoo.com

[grizz]

I have a completely blueprinted and balanced 25 3 blade that I bought for my Donzi and never put it on the boat before I sold it. If you are interested let me know I'll make you a killer deal.....actually I have both a 23 & 25 that I never put on.....they won't work with my current boats and I just pulled them out of the closet today when I was doing some straightening up inthe garage.

Paul

paul prop needs to fit volvo penta 19 spline interested in your 25 pitch ,thanks clayton

[Paul65K]

paul prop needs to fit volvo penta 19 spline interested in your 25 pitch ,thanks clayton

Mine are for
Mercury drives.