What's the best size prop

[Poormansboating]

Got a 1989 85 hp on a 1991 17' Bayliner Capri. Right now I've got a 15" pitch 3 blade and I can get 25 mph maybe 30. It gets there real fast. What prop can I use to get some more top end.

 

[Scott Danforth]

and what RPM is the motor running?

 

[Poormansboating]

That idk I have no tach yet

 

[Poormansboating]

The prop is what was on the moter when I got it

 

[Scott Danforth]

That idk I have no tach yet

Step one in buying a prop, is knowing your RPM

 

[Poormansboating]

Will do. Will a small aftermarket work like from AutoZone or any parts store. Or do I need a special one for boat

 

[Scott Danforth]

Not sure AutoZone has any marine things.

Bring a buddy, have the cowl off and use a photo tach, or get a tinytach. You need to know the RPM the motor is getting to at WOT

 

[Poormansboating]

I will do my research on those two and give it a try thanks for the advice sir

 

[jerryjerry05]

That boat comes with a 90hp. and a 17 or 19 aluminum.
Your 15p is it aluminum or stainless?

 

[Poormansboating]

It actually come Factor with a 50hp force and the prop on it now is alluminum.

 

[Poormansboating]

Factory with a 50hp force. I put the 85 on it. It does really well and gets on plane great now after adding the hydrofoil. Just trying to get a little more top end so I can keep up with friends on the water. The whole shot is amazing as only a few seconds and I'm at top speed.

 

[Poormansboating]

Props are so expensive I just want to make sure I make the right call before buying one.

 

[jerryjerry05]

Try your local boat places, some have used props they loan out to make sure you get the right one.
Michigan Propeller has a prop finder service.
Contact them with the info and maybe they can recommend the right one?

 

[Scott Danforth]

Props are so expensive I just want to make sure I make the right call before buying one.

read this on props and the information needed.

Read This First!!

ESSENTIAL DATA REQUIRED When posting a question about propellers, you cannot get a reasonable answer unless you provide the following information in your post: Items 1-4 are essential for meaningful response to most questions. 1) Performance issue you are trying to correct. 2) Current prop...

forums.iboats.com

you are missing 3 out of 6 bits of very important pieces of information for anyone to make a wild-a$$ guess as to which prop you need.

the most important bit of information is what RPM you are at.

 

[Poormansboating]

1989 85hp force outboard, 1992 Bayliner Capri 17' bow rider three blade alluminum prop. 15" x 13 1/2 I believe has a stingray senior hydrofoil. Current speed is 25 to 30 mph. Weight and rpm is n/a yet coming soon. What I'm looking for is more top end speed so I can keep up with buddies a little better.

 

[Poormansboating]

I think it is a Michigan prop on it now

 

[Scott Danforth]

what RPM? the RPM of your current setup is the single most important bit of information. keep asking your question, we can not answer it until you post what your RPM is.

 

[jerryjerry05]

1989 85hp force outboard, 1992 Bayliner Capri 17' bow rider three blade alluminum prop. 15" x 13 1/2 I believe has a stingray senior hydrofoil. Current speed is 25 to 30 mph. Weight and rpm is n/a yet coming soon. What I'm looking for is more top end speed so I can keep up with buddies a little better.

Put a 17-19 on it and you'll go faster

 

[Poormansboating]

Gonna go with a 19 I believe