Advice on a new prop

[gtpimp024]

Hey guys I have an 82' formula 22ft with a mercruiser 260.. She does ~45mph WOT @ 4500 rpms with a 17 pitch.. What would a 19 pitch get me? Thanks!

 

[Bifflefan]

Re: Advice on a new prop

Around 48 or 49 at the same RPM.

 

[gtpimp024]

Re: Advice on a new prop

Around 48 or 49 at the same RPM.

I thought you lose 300-400rpms when going up one pitch size?

 

[Bifflefan]

Re: Advice on a new prop

I thought you lose 300-400rpms when going up one pitch size?

Its about 2 or 300 I think.
but I thought you were asking about the speed.

 

[steelespike]

Re: Advice on a new prop

Its difficult to say any precise speed change it depend on the final rpm.
"about" 200 rpm per inch is a rule of thumb with "about" being the key word.
Your present rpm is below the max; 19" would create lower rpm would cause lugging slower hole shot and possibly slower speed.imo speed increase is a toss up.

 

[gtpimp024]

Re: Advice on a new prop

well i was just out on her today and at WOT it will hit 4900rpm's and get out of the water pretty quickly... Would a Mercruiser Alpha prop fit my 82' Mercruiser outdrive?

 

[gtpimp024]

Re: Advice on a new prop

Guys, having trouble finding a prop that will fit my 82 mercruiser outdrive.. Any suggestions?

 

[sethjon]

Re: Advice on a new prop

Assuming you stay with Al. or Steel, which ever you have, I think you'd like the 19 better. It will be a little less of a hole shot but will still have plenty to pull a skier. At WOT the RPMS will be down about 3-400 which is better for the engine anyway.