prop for 2.5l mercruiser

[KIRKUSN]

I have a 2.5l mercruiser 120hp on a 1983 18' glastron and i want to get a new prop but i dont know what pitch i should get. I do alot of trolling but i do want some speed also. i have a trolling plate i can put on. the prop on it now is some type of plastic or carbon material and i dont know what the pitch is i cant find it anywhere on it.

 

[elkhunter338]

Re: prop for 2.5l mercruiser

I run an adjustable prop on my 140hp (3.0l merc), there are two companies that have the adjustable prop. Pirahna and a prop that westmarine sells. Ihave the westmarine prop which so far (5yrs) has worked fine, I think the pirahnna props looks for durable. If you are not against composit props I like the adjustable props to fine tune the pitch.
I run a 4 blade at 16pitch, speed is 27 mph @ 3800rpms, but I have a 21 foot starcraft cheiftain. Boat weight is about 4500lbs including trailer.

 

[steelespike]

Re: prop for 2.5l mercruiser

Did you look under the prop nut for numbers?
We really need your prop size,a prop shop could measure it for you.
Also need your present max rpm and speed.You might also look for the gear
ratio perhaps in the manual or on the outdrive.