1993 TX-17 Evinrude 40, 15" pitch vs 17" pitch 5,200 vs 5,800rpm

TX-17

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Jul 15, 2013
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This is what I have:
a 1993 Evinrude 40HP twin
on a 1993 Bass tracker TX-17
31 MPH @ 5200 RPM with 17" pitch aluminum Prop (GPS)
31 MPH @ 5800 RPM with 15" pitch aluminum Prop (GPS)

Recommended RPM range is 4,500 to 5,500 RPM for the 40HP <-- I have the 40 hp

Here is my question:
Since this is the lowest horse power rating for the 737 CC family of Evinrude engines (40, 48, 50, 60 HP) and the rpm range of the 60 appears to top out at 6,000 rpm, am I hurting this 40hp engine by running the 15" Pitch at 5,800 WOT?
I tend to run WOT about 30 percent of the time and only about 4,500 rpm for most other adventures.

I fish..
But I also like to skip across the water..

I like the 15" pitch, but am worried I might possibly be over-revving.

If the 60 HP Evinrude 737cc motor has basically the same parts (Pistons, Rings, Head) as the 40, then is it safe to assume this 40 HP motor can spin like its more powerfully tuned, same sized 60hp brother?

Some have suggested that running at this higher RPM is actually easier on the 40 HP motor than running the higher pitch at 5,200rpm

I asked this on another forum, but there appears to not be as much traffic over there.
It occurred to me, this would be a better, more Evinrude 40, bass tracker friendly forum to post this question.

Your opinions will help me greatly.
Thank you in advance...

PS. Also, where can I download the spec's for the 737cc engines?
I would like to figure out propeller slippage by computing engine rpm times gear ratio times pitch.
 
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TX-17

Cadet
Joined
Jul 15, 2013
Messages
7
Re: 1993 TX-17 Evinrude 40, 15" pitch vs 17" pitch 5,200 vs 5,800rpm

Where can I download the spec's for the 737cc engines?
I would like to figure out propeller slippage by computing engine rpm times gear ratio times pitch.

Okay, I found out the gear ratio is 2.41 to 1
This helps me a lot..

Today I installed a brand new 12 1/4" X 15" pitch aluminum propeller (made by QL)..
Really thought hard about buying the 17" pitch..
Evinrude recommends the 17" Pitch, but that is a general recommendation..

Assuming the engine will handle 5,800 to 6,000 rpm 30 minutes at a time, seems I am good to go..

Time to go hit the water~~~~
 
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