OMC 5.7 L 15 x 11 pitch prop

leetbeef9999

Cadet
Joined
Jul 11, 2004
Messages
18
I am searching for a 15" diameter by 11" pitch prop for a 1986 5.7 L 350 cubic inch V-8 OMC sterndrive. Does anyone know where I can purchase one?
 

Boatin Bob

Lieutenant Commander
Joined
Sep 24, 2001
Messages
1,858
Re: OMC 5.7 L 15 x 11 pitch prop

11 in pitch seems awful low, don't know what kind of boat you have but normally a 5.7 would have a 15x15 or 15x17....you sure your looking for an 11?
 

leetbeef9999

Cadet
Joined
Jul 11, 2004
Messages
18
Re: OMC 5.7 L 15 x 11 pitch prop

Bob,<br /><br />We have been having problems with getting the revs up on the boat. The most the boat will rev to is 3200 RPM, and there doesn't seem to be a carb problem. We're trying to lighten up the load on the engine, so hopefully a smaller pitch will do that. Any ideas on the 11"?
 

crazy charlie

Vice Admiral
Joined
May 22, 2003
Messages
5,352
Re: OMC 5.7 L 15 x 11 pitch prop

I think you are going the wrong way.A 14x17 will get your rpms higher and be easier on the motor.to use a 15x11 would be making the motor work harder and the rpms and speed will go down.Sounds like a houseboat prop is what you are looking for and I would strongly recommend against it.If you did find the prop,the moment you put the boat in gear it will jump.Charlie
 

Boatin Bob

Lieutenant Commander
Joined
Sep 24, 2001
Messages
1,858
Re: OMC 5.7 L 15 x 11 pitch prop

Well...I searched a couple of prop sites but they don't even list a 15x11, maybe you could give us a few more details about your problem, what kind of boat, size and weight? What size prop are you running now? A 5.7 should be in the 4200-4400 range at WOT so you are very low, are you sure about your tach, have you tried a portable one to be sure?
 

cuzner

Senior Chief Petty Officer
Joined
Feb 14, 2004
Messages
771
Re: OMC 5.7 L 15 x 11 pitch prop

Hey bob, you may be able to get your existing prop re-pitched at a prop shop to that pitch.Perhaps you should find out why your only reaching 3200 with the recomended prop before you spend 200$ to get this done.<br /><br /> Jim
 

jimmbo

Supreme Mariner
Joined
May 24, 2004
Messages
12,944
Re: OMC 5.7 L 15 x 11 pitch prop

Your engine has a 4 barrel carb. Are you sure it operating properly and the secondaries are opening? Depending of gear ratio of coarse, you normally need a pretty big boat to require a prop less than 17"
 
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