Selecting Propeller for E-TEC - Moderated Discussion Areas

  ContinuousWave
  Whaler
  Moderated Discussion Areas
  ContinuousWave: Whaler Performance
  Selecting Propeller for E-TEC

search | FAQ | profile | register | author help

Author Topic:   Selecting Propeller for E-TEC

mphillips posted 04-26-2009 05:31 PM ET (US)
Is the goal in selecting props to hit max RPM (5500 - 6000 is redline for my motor) for motor at WOT? My Evinrude ETEC Owner's Manual says [misquote of E-TEC manual has been deleted so as not to spread this misconception.] The manual goes on to say that I can run redline for 6% of the time the engine is running. Currently my prop runs the boat at 5000RPM at WOT. What do I need to do?
Mike
Peter posted 04-26-2009 06:53 PM ET (US)
Ideally, a 115 E-TEC should be propped to achieve 5,600- to 5,700-RPM at WOT under normal load conditions. If you E-TEC is only reaching 5,000-RPM, you need to switch to a propeller with lower pitch, about 4 inches lower. For example, if the current propeller has a 21 inch pitch, you will need a propeller with a 17 inch pitch.
Dick E posted 04-26-2009 05:55 PM ET (US)
The goal is have your prop at WOT turning in the upper end of your max prop rating with a light load.
If your max RPM is 5500-6000 you should try to get 5700 to 6000 RPM.
If you decrease the pitch on your current propeller 1" you should get about 200 to 250 increase in RPM.I would try a prop with 2-4' less pitch, different props behave somewhat different so you have to due a little experimenting
fishgutz posted 04-26-2009 05:59 PM ET (US)
Mike, you need to quote exactly what your manual says. What you are stating doesn't make really sense. If you are running 5000 RPM at WOT then you are close to where you should be. You need to drop down 1 inch or 2 in pitch and you will be close to the recommended WOT RPM rating of between 5500 and 6000 RPM.
Phil T posted 04-26-2009 06:23 PM ET (US)
Mike -
To further refine the above information.
Many recommend setting up the motor/prop for the light load. This means, one operator, light gear and 1/2 load of fuel.
If you operate the vessel with a significant load (i.e. 4 people, full tank of fuel and gear) 90% of the time, it is recommended to prop the boat for that load.
It might be helpful if you state the model of hull, engine hp and current propeller brand with diameter and pitch and the motor height on the transom.
mphillips posted 04-26-2009 06:28 PM ET (US)
fishgutz
I hear you. It doesn't make sense to me either. I will quote from the Evinrude Operator's manual (also printed in the Service Manual) for my ETEC 115.
"The correct propeller, under normal load conditions, will allow the engine to run near the midpoint of the RPM operating range at full throttle."
Dick E posted 04-26-2009 06:41 PM ET (US)
The operating range at WOT 5,500- to 6,000 RPM,thus midpoint is 5,750 RPM
fishgutz posted 04-26-2009 08:58 PM ET (US)
Dick E has it right.
The manual could have been worded better.
Prop selection usually consists of some trial and error. Everyone here has so far given you good information. Tom W Clark (CW user name) will probably chime in and give you more good info. Otherewise look him up. He is the resident expert (among others). I think he sells props too.
jimh posted 04-26-2009 10:33 PM ET (US)
This discussion was initiated in more than one forum. Please do not initiate the same discussion in multiple places.
In the course of this discussion some inaccurate information was given. To stop the spread of inaccurate information it has been deleted from this discussion.
The duplicate discussion has been deleted and its contents combined with this discussion. The process of doing this takes a lot of time for the moderator, so it would be greatly appreciated if it could be avoided by simply not initiating duplicate discussions.
jimh posted 04-26-2009 10:44 PM ET (US)

quote:
..."5500 - 6000 is redline for my motor"...
From the above information, I would infer that the REDLINE or maximum engine speed for your motor is 6,000-RPM.
The recommended maximum throttle or wide-open-throttle engine speed range is 5,500-RPM to 6,000-RPM.
Tom W Clark posted 04-27-2009 07:10 PM ET (US)
Neither the thread title nor original post mention the model of E-TEC we are discussing or the boat it is mounted on.
Peter assumes it is a 115. Where does that information come from?
What was the context of the origin of the original post?
Peter posted 04-27-2009 07:50 PM ET (US)
Tom -- No presumption.
"I will quote from the Evinrude Operator's manual (also printed in the Service Manual) for my ETEC 115." -- mphillips 4/26/09 6:28pm.
Note my post is at 6:53pm. ;) Product of merger.
jimh posted 04-27-2009 08:51 PM ET (US)
ASIDE: It would be wonderful if people only posted one article, if they clearly stated all the appropriate background information in a simple declarative sentence that began their article, and if they made an explicit inquiry or question without ambiguous references.
Sometimes you have to read these threads like a detective trying to solve a mystery. A tip of the hat to Peter for putting together enough of the pieces of information scattered in the discussion to deduce the horsepower of the motor.
Backfire posted 04-27-2009 10:12 PM ET (US)
Hope this will help. [Linked to a thread on another website which repeated the same information give above regarding the manufacturer's recommended range of engine speed at wide open throttle--jimh.]
Tom W Clark posted 04-28-2009 12:41 AM ET (US)
Though the E-TEC 115's recommended WOT RPM range is 5500-6000 RPM (and the redline is thus 6000 RPM), the optimum WOT RPM range is 5600-5700 RPM for 2009.
2009 RPM QUICK REFERENCE CHART
Model Recommended
Operating Range Optimum
RPM Range
25 HP 5000-6000 5400-5800
30 HP 5000-6000 5400-5800
40 HP 5000-6000 5400-5600
50 HP 5500-6000 5600-5750
60 HP 5500-6000 5600-5750
65 HP Commercial 5500-6000 5600-5750
75 HP 4500-5500 5000-5200
90 HP 4500-5500 5000-5200
115 HP (60° V4) 5500-6000 5600-5700
115 H.O. (60° V4) 5500-6000 5500-5650
130 HP (60° V4) 5500-6000 5500-5650
150 HP (60° V6) 4850-5850 5500-5600
150 H.O. (60° V6) 4850-5850 5500-5600
175 HP (60° V6) 4850-5850 5500-5600
200 HP (60° V6) 4850-5850 5600-5850
200 H.O. (3.3 L 90° V6) 4500-5800 5500-5600
225 HP (3.3 L 90° V6) 4500-5800 5500-5600
225 H.O. (3.3 L 90° V6) 4500-5800 5500-5600
250 HP (3.3 L 90° V6) 4500-5800 5500-5600
250 H.O. (3.4 L 90° V6) 4500-5800 5500-5600
300 HP (3.4 L 90° V6) 5000-6000 5500-5600
jimh posted 04-28-2009 01:39 AM ET (US)
I would not be surprised if the somewhat smaller ranges of engine speed that are given as the optimum represent the peak of the horsepower curve for the motor.
Generally I abhor pictures of text, so I will shortly turn that picture of text into text. Thanks to all who linked to the picture of the text as it as been widely posted to different websites.
As Tom mentions, for the E-TEC 115-HP the target for optimum engine speed at wide-open-throttle is 5,600 to 5,700-RPM.
Striper15 posted 04-28-2009 12:40 PM ET (US)
I am turning a 19" Viper on my E-tec 115 and WOT engine speed is right at 6,000-RPM. [Pointed to an] article on prop selection [written by an Evinrude dealer in New York and hosted on his own website which has a domain name that misleads people into thinking it is published by Bombardier or Evinrude.--jimh.]
jimh posted 04-30-2009 08:58 PM ET (US)
I think the chart above is more significant in selecting a propeller for an E-TEC. Those target engine speeds listed as optimum are the engine speeds where the peak horsepower is produced. If you use a propeller that puts the engine into that narrow range, you have allowed the engine to develop its peak horsepower.
jimh posted 05-02-2009 11:14 AM ET (US)
See:
http://continuouswave.com/whaler/reference/ETEC_EngineRPM.html
for the recommended optimum engine speed at wide-open-throttle for 2009 E-TEC engines.

Hop to:

Contact Us | RETURN to ContinuousWave Top Page

Powered by: Ultimate Bulletin Board, Freeware Version 2000
Purchase our Licensed Version- which adds many more features!
© Infopop Corporation (formerly Madrona Park, Inc.), 1998 - 2000.