Prop Pitch

[zach103]

How do i know what pitch i need for my prop.. using the marine store i got to the engine i have but it came up with picthes from 9-24. what one do i need?

 

[Dhadley]

Re: Prop Pitch

Which one do you need? The one that puts your top rpm where you want it with an average load.

A little more info is needed. What motor, boat, use and info on props already tried?

 

[zach103]

Re: Prop Pitch

sorry..

its an 86 Johnson SPL 90hp. on a 86 Larson Senza V-175BR..
max hp is 150 and i know the 90 is a little low but i don't have the money for a new engine right now..

average load is prolly 3 -4 adults. no real water sports. just kind of lounging maybe the ocasional tubing.

any other info you need im happy to tell you

 

[Tacklewasher]

Re: Prop Pitch

Best way to figure out what you need is to provide comparison info on what you have.

So, which prop do you have?
Alum or SS?
What size?
What pitch?
What is your top speed (gps) with this prop?
What is the RPM @ WOT?
How do you boat? Pulling skiers, tubers or looking for top end speed?
What is your current prop doing that makes you want to change it?

 

[zach103]

Re: Prop Pitch

i was told to change this one or get it repaired because its giving me vibrations in the hull on acceleration

 

[Dhadley]

Re: Prop Pitch

What size is it? What were the top rpms before it was damaged? Top speed?

 

[zach103]

Re: Prop Pitch

im not sure the size i guess this thread will be stalled for a while. lol. im at school i can get the size when im home on friday.. tach was stuck at 7 when we bought the boat boat.. its on the winter parts list. i dont know the top speed. weve only had it a year or so and last year the shaft broke. i got up to 30 this year but using the speedo from the boat. i need to borrow a gps.

i usually go out just to relax kind of thing. i occasionaly pull people in the tube. im really looking for more speed.

 

[zach103]

Re: Prop Pitch

i hope i got all the questions so far

 

[Dhadley]

Re: Prop Pitch

My guess is that it probably has a 17 on it or maybe a 19. Really hard to say. Could be either and either one could be set up wrong, or at least not as good as it should be. If it's been sitting for more than a month I'd suggest cleaning the carbs first before testing.

 

[zach103]

Re: Prop Pitch

the guy did that the week before we started it back up..but how do i do that so i know how to for the future.. i remember seeing a 13 i think but that might be something else

 

[zach103]

Re: Prop Pitch

alright its a 15 i believe i got this off of it 3 3/4 x 15
than 391198?

so is 15 the wrongs size if your guessing 17 and 19??

 

[Randybeall]

Re: Prop Pitch

You can probly save yourself some time and money by taking that prop to a prop repair shop. Not only can they tell you how much it would cost to repair if that is possible, they can measure it and tell you exactly what it is. Just a thought, I never seem to have as much money as the BOAT wants.