ETEC RPM QUESTION

[senkoman]

I am running a 2007 ETEC 225 HO and I have been trying props and prop heights to look for a balance in speed, handling, and holeshot.

This weekend I tried out a RakerII 28 and got more top end speed and seemingly better handling out of the boat but, definetly gave up hole shot. Plus it seems to take just a little longer to get it up to the top end.

I dropped from running about 55-5600 RPM using a Tempest 27 down to about 52-5300 RPM using the Raker 28.

My question for the mechanic gurus; is it OK to seemingly put a bigger load on the motor and run at the lower RPMS or would it be better to run the smaller prop and get just a little less speed and run a higher RPM?

[AB]

NO!!! Prop it to turn 5700-5750 on the top end and the motor will be very happy.... Loading a motor with a large prop is the worst thing you can do to an outboard...

[rockstar]

I've read that they like to be propped to around 5400-5500?? So with what your saying this is not true?

[AB]

From all the props I tried, 5700-5750 yielded the best overall results in holeshot, top end, fuel economy, and mid range acceleration, while keeping it within the rpm parameters for warranty purposes.

[senkoman]

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by AB &raquo;</TD></TR><TR><TD CLASS="quote">From all the props I tried, 5700-5750 yielded the best overall results in holeshot, top end, fuel economy, and mid range acceleration, while keeping it within the rpm parameters for warranty purposes. </TD></TR></TABLE>

So there are 'warranty' guidelines? Any way to find this information out online?

[AB]

You see that part in your owners manual (and the tag on the motor) that says "Recomended RPM range"....that would be the guidelines...

[ELGIN]

Make sure the RPM the tach shows are the REAL RPM's, this can be checked with the Dealers software.

[ghind]

On dealerport, evinrude recommend to prop the motor for 5600rpm.

I would personally prop it to turn a bit higher as use is waterskiing, but I rarely actually run at full speed with no load.

[rockstar]

I have I-Command gauges and I've been testing props for the past month. I have twin 225 E-Tec's and I've propped everywhere from 5300 to 5900. I got the best cruise MPG and the best top end when propped at 5400-5500. I haven't purchaced any props yet cause I'm still testing but I also don't want to hurt the motor.

[senkoman]

Well based on the manual it is a wide range! (no tag on my motor regarding RPM).

Based on comments here and other boards it seemed to be a slight mix, so I called BRP and you're right on the money according to them!
5700-5800

Thanks guys!

I am going to raise the motor a tad to see how it handles RPM... and I might be selling/trading this new prop RakerII 28 for a 26.

[Garfish]

On page 46, of the operator,s guide,where the specs for my engine are located 'full throttle operating range' for 250HP 4500--6000

[ELGIN]

Yes, that is true but you should prop it to the top of the RPM range, 5700-5800.

[AB]

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by senkoman &raquo;</TD></TR><TR><TD CLASS="quote">Well based on the manual it is a wide range! (no tag on my motor regarding RPM).

Based on comments here and other boards it seemed to be a slight mix, so I called BRP and you're right on the money according to them!
5700-5800

Thanks guys!

I am going to raise the motor a tad to see how it handles RPM... and I might be selling/trading this new prop RakerII 28 for a 26.
</TD></TR></TABLE>

Good luck! I've run dam close to 20 props on my rig now, just trying to find the right one, and always settle back on the Raker 2's....