Prop pitch/size ?

[Marmon]

I know I should probably ask this in the Johnson/Evinrude forum but since it's on a pontoon I figured why not here! I have a 1982 50 hp Johnson on a 20' pontoon. I'm looking at replacing the prop. Whats on there now is a 13x11, it pushes pretty good with this one but I don't have a tach so I don't know the RPM's. I would just like to know a good starting point.

 

[hellion68]

Re: Prop pitch/size ?

http://www.mercurymarine.com/propellers/prop-selector/#

Try this out! Without the rpm it will get you close.

 

[lncoop]

Re: Prop pitch/size ?

What's pretty good? I agree the prop finder will get you close, but if it's at all feasible you should consider adding a tachometer. RPMs are pretty important. How would it make you feel if you didn't know what your truck was taching at 75 mph? Just a thought.

 

[ilovemyfourwinns]

Re: Prop pitch/size ?

Yeah, knowing the RPMS would be important, because you can then find the right prop size that is appropriate for want you to do, because i went to find a new prop recently for my fourwinns, and i had to figure the rpms out so i can change the prop pitch accordingly. http://www.piranhapropellers.com/finder/step2/johnson