What to do with my prop

[Artate78]

1544 g3 1993 25 evinrude turns 5900 with 13 pitch so swapped to a 14 pitch and now it turns 5000 trying to get to 5500 what should I have done to the 14 pitch to get there

 

[Brewman61]

Re: What to do with my prop

Surprised you saw that much of a drop with only one inch pitch change. Sure about all those numbers? How you tracking RPM's?

 

[PROPer]

Re: What to do with my prop

Who is the manufacturer of each of the props?

 

[Daleg70]

Re: What to do with my prop

seems like something else is happening -- the typical change is 200-300 RPM for the pitch change-- assuming the same design and same construction of prop. If you changed materials --- say stainless to aluminum, you have other issues.

Do you have the old prop? and is it in reasonable good condition.
If so -- I suggest having a double cup put on it -- and see how much this brings down the rpm -- (assuming it has not already been cupped) ---
That is a cheap thing to try --- should only be $30-50 at a typical shop -- more maybe if you have the prop reconditioned at the same time -- but still under a hundred.

 

[Home Cookin']

Re: What to do with my prop

be sure your diameters are the same, too. That is a factor

 

[Artate78]

Re: What to do with my prop

Both props are brand new ss power tech both or 10 inch checking rpm with tiny tach swapped them back and forth a few times to make sure I was getting same rpms it repeats every time

 

[Artate78]

Re: What to do with my prop

31 mph with 13 and 30 mph with the 14