Will a steeper prop fix this?

[gspig]

I had to change outboard units. I have a 165 6 cyl mercruiser. The outboard was a 165hp. I had and installed a 120/145hp outboard. The gear ratio is definately different. I went from 4300 rpm WOT to past 5000 rpm. Planing rpms went from 3200 to 4300. Both outboards have a 19 pitch 3 blade prop. Will a 21 pitch prop correct this?

 

[Don S]

Re: Will a steeper prop fix this?

This is an outdrive:<br />

<br /><br />These are outboard:<br />

<br /><br />Now that we have that squared away, to find out if that prop will work, we need to know what size of prop you now have on it.<br />As a rule of thumb, an increase of 1" or pitch or diameter will give you around 200 to 250 rpm's of change. The more pitch the less rpm.

 

[gspig]

Re: Will a steeper prop fix this?

So, theoretically, to get back to where I was I need a 24 pitch prop. And incidentally, it is an outdrive.

 

[Bondo]

Re: Will a steeper prop fix this?

So, theoretically, to get back to where I was I need a 24 pitch prop.

Ayah............<br />Somewhere in that Neighborhood,..... Theoretically........