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Mate
Posts: 1
Registered: ‎05-19-2017

max WOT for 25 hp 2017 Etec

I have a 20' pontoon with a 25 HP 2017 Etec, and I am trying to determine the correct prop for the combo. With a 11x7 4 blade at WOT it hits 6000 RPM's for a max speed of 9-10 MPH. With a 11x9 3 blade at WOT it hits 5100 RPM's for a max speed of 11-12 MPH.
When I called Evinrude hey were no help. The services rep told me they o not provide technical support and to call a dealer. I have talked to several dealers and get no help form them...they tell me to talk to Evinrude.


When researching props, I noticed that most props for the 15,25, &30 Etec are 10" in diameter and not 11"


So, on pontoon, should I be using a 10” prop vs an 11” prop? My objective is not fast hole shoot with my pontoon but a good top end speed with a good load performance.
Any suggestion?

 

Thanks in advance,

Pat

Admiral
Posts: 8,402
Registered: ‎07-14-2011

Re: max WOT for 25 hp 2017 Etec

[ Edited ]

 

 

A 25 HP on a 20' pontoon boat may be considered a little under-powered, thus the low speeds. Your engine specs call for the motor to be propped for full throttle in the 5500-6000 rpm range with a normal load which makes the 11 x 7 prop in the ball park. You may also want to try the 10 x 11 SSP - #765176 - to see how that performs.

Prop diameter is designed by the engineer to be most efficient for the pitch and the speed of the boat. As a rule of thumb,for the same engine, a lower pitch is for slower boats and usually has a larger diameter than the higher pitched props. 

With a pontoon boat you always want to prop at the top of the rpm range because as you add more people and gear, the engine will still be in its recommended operating range.


 

 

 


"There is never just one thing wrong with a boat";
                    -- Travis McGee, main character in a book series by John D. McDonald 


 



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The factory recommends that a properly trained technician service your Johnson or Evinrude outboard motor. Should you elect to perform repairs yourself, use caution, common sense, and observe safety procedures in the vicinity of flammable liquids, around moving parts, near high-temperature components, and working with electrical or ignition systems.

The information offered here is only general in nature and should not be construed as complete factory approved procedures, techniques, or specifications. Always use the proper service manual for your motor, up-to-date service literature, the correct tools, and have an understanding of how to proceed with troubleshooting and repair methods. If you are unsure or uncomfortable with a procedure, a situation, or a technique, enlist the services of a factory trained technician.


Captain
Posts: 598
Registered: ‎08-20-2017

Re: max WOT for 25 hp 2017 Etec

The smaller diameter 10 x 11 that Bill suggested will likely give you more top speed.
A higher pitch 7, 9, 11. Will give more speed but loose power on the low rpm end.
A consideration on most pontoon boat is low speed handling. Going to a smaller blade diameter 11 to 10 is likely to reduce your power in reverse.