proper rpm and propeller size

[vike84]

I bought a 1987 rinker boat with a mercruiser alpha one 3.0 liter motor, does anyone know what rpm is ideal? and the boat came with 2 propellers a 19 and 21 pitch and now I need to replace them any ideas of which is better for mostly high end running and pulling tubes?

 

[Bondo]

Re: proper rpm and propeller size

Ayuh,... That motor wants to run 4200/ 4800rpms at wot...

Whichever prop yeilds those #s is the 1 you want...

 

[Don S]

Re: proper rpm and propeller size

The WOT rpm for that engine is 4200 to 4600.
Will move this over to the prop forum for prop choices.

 

[hwsiii]

Re: proper rpm and propeller size

Vike, we welcome you to the forum and hope to be able to help you with the questions you need answers to. If you will supply us with the answers to the questions listed below we will have everything we need to help you with your quest, in most cases.

Boat and Motor

H

 

[vike84]

Re: proper rpm and propeller size

thank you very very much