prop pitch help

[markcos]

hello everyone! i have a 1976 srv 240 sundancer with a prop pitch problem. a friend wiped out the prop last year and bought a new one and i think it is the wrong one. since i put this prop on the boat i can only get up to 2500 rpm. does anyone know the proper pitch for this boat, some one told me 17 and i cant seem to verify this ANYWHERE!!! all help would be greatly appreciated.

 

[ce560drvr]

have 72 weekender and currently have a 19 pitch on. Get about 30 mph at 4300 rpm. I am going to experiment with a 17 and 21 pitch also.

 

[sprink56]

hello everyone! i have a 1976 srv 240 sundancer with a prop pitch problem. a friend wiped out the prop last year and bought a new one and i think it is the wrong one. since i put this prop on the boat i can only get up to 2500 rpm. does anyone know the proper pitch for this boat, some one told me 17 and i cant seem to verify this ANYWHERE!!! all help would be greatly appreciated.

OK...Crystal Ball again.

An educated guess is that you have a 260/280 MerCruiser on a No. 1 drive with a 1.5:1 gear ratio. I'll bet lunch it came with a 17" or 19" prop and that you are trying to run a 21" or even a 23" pitch.

In any case...here is the link to the prop chart for '76 model Sea Rays right on the Sea Ray web site....
http://www.searay.com/boat_graphics/electronic_brochure/Company1729/1C1_25_74DEIP4PU07.pdf

Your welcome...:grin:

 

[winstonwilliams]

Sprink56 where did you get that file for the 1976? I have a 1992 290 SeaRay and I think it has the wrong prop on it.

Thanks for the help

Winston

 

[winstonwilliams]

I have a single engine Sea Ray 290 with a 502 in her.. She has a 23 pitched SS prop, but for some reason the boat is only running at 3700 rmp at wide open throttle. I was thinking that the pitch of the prop might be high. Any ideas?

 

[Lazy Daze]

Marckos, unless you've got something like a 31" prop on there, that's not your problem.

Greg - don't bother with the 21" - you're only going to lose RPM and get further away from design spec for efficiency on your engine.

Sprink - where did you get that crystal ball? I think it might come in handy to have one of those!:grin: