1991 Chiscraft 252 crowne correct prop? and or help

[danalbrecht]

I purchased project boat 1991 ChrisCraft 252 Crowne OMC 5.7 liter Cobra outdrive. There was no prop, therefore I purchased a 14.8 diameter 15 pitch prop, took boat out today, wont come off plane or go over 10 mph, 2500 rpm max. If I put boat in neutral I can get 5,000 rpm..


Is this a pitch problem or something else,,, What size pitch should I have. Thanks

 

[southkogs]

To gain RPMs, you generally go down in diameter. But I wouldn't think you can afford to lose much more diameter on your prop. When you're on the trailer, can you get more than 2500 RPM in gear? (obviously with water flowing)

 

[danalbrecht]

Thanks for the reply I gave up for a little bit, heres where I am. 5.7 260 hp omc cobra dry weight 5900 lbs. 15 inch prop. new wires plugs cap rotor, changes spreadbore holley carb to Rochester, timing 8 degrees

Idles perfect, revs up past 5000 no problem in neutral

absolute pig under load me and 2 guys guessing 600 total will not get on plane

The best I ever had has 30 mph by speedo, not bad, long time to get on plane and 4100 rpms Only 2 people 1/2 tank gas no water

lately 3500 rpms wot wont plane

didn't come with a prop don't know what this should have and nobody seems to know

 

[Bondo]

Ayuh,.... Sounds like it ain't gettin' fuel,...

Is the carb used,..?? is it workin' proper,..??

Hook a remote gas can to a fresh fuel filter, to the fuel pump, 'n try it,...
That'll eliminate the boat's fuel system side of it,....

 

[southkogs]

Have you weighed your boat?

Dry weight usually means without the drive/engine, but I think that's supposed to be combined weight for your boat. This is a cruiser, right? 27'?