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  I-Command Gauge ENGINE LOAD

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Author Topic:   I-Command Gauge ENGINE LOAD
tmann45 posted 11-08-2008 10:55 AM ET (US)   Profile for tmann45   Send Email to tmann45  
Just got a 2009 Evinrude E-TEC brochure. On the I-Command page the picture shows an ENGINE LOAD window with 41% displayed. Anyone familiar with this? Is the engine load a percent of available horsepower or torque at that RPM or is it percent of total that the engine can develop? What is the gauge telling us? Is it useful information? How can this information be used?
seabob4 posted 11-08-2008 06:00 PM ET (US)     Profile for seabob4  Send Email to seabob4     
Tom--I-Command displays engine load as a percentage of throttle.
cooper1958nc posted 11-08-2008 09:03 PM ET (US)     Profile for cooper1958nc  Send Email to cooper1958nc     
"Engine load as a percentage of throttle" is not very clear. It COULD mean manifold pressure as a percentage of (sea level) MP, but that would be misleading at anything but sea level (the percentage would be). It COULD mean how much mechanical travel the throttle has taken up, but that is really meaningless.

I bet its a fuel flow indicator, giving a percentage of sea level full power fuel flow assuming dry air at standard pressure and temperature. But even that is pretty wierd. So maybe someone can clarify this.

seabob4 posted 11-08-2008 09:38 PM ET (US)     Profile for seabob4  Send Email to seabob4     
Never mind. "percentage of throttle" is what it says in the I-Command manual/guide/sales brochure. But I guess you know more than we do.
jimh posted 11-08-2008 10:22 PM ET (US)     Profile for jimh  Send Email to jimh     
I believe that the reading shown on the ENGINE LOAD display is a percentage corresponding to the amount of the throttle position rotation, with 100-percent being maximum opening. The highest I saw in my testing of an E-TEC 250 H.O. was 97-percent. At typical cruising speeds the reading was in the 30- to 35-percent range.
an86carrera posted 11-08-2008 11:53 PM ET (US)     Profile for an86carrera  Send Email to an86carrera     
Coop,

I think I agree with you. As far as the sea level thing goes, barometric and temperature sensors are part of the system and readable on the network. So, your statement could be true at any elevation or temperature.

I have an E-TEC with a full NMEA-2000 network connected to a Lowrance 520c display, and, obviously, I also have the 'ENGINE LOAD' output data. I believe it and see it and feel it to be exactly what it says it is: ENGINE LOAD.

Disclaimer: This is a completely seat-of-the-pants observation.

Len

tmann45 posted 11-09-2008 07:27 AM ET (US)     Profile for tmann45  Send Email to tmann45     
quote:
"percentage of throttle" is what it says in the I-Command manual/guide/sales brochure

Thanks Bob, it could have been labeled percent throttle and that would be very clear.
jimh posted 11-09-2008 09:55 AM ET (US)     Profile for jimh  Send Email to jimh     
Moved to SMALL BOAT ELECTRICAL for further discussion.
jimh posted 11-09-2008 10:02 AM ET (US)     Profile for jimh  Send Email to jimh     
I found the ENGINE LOAD information to be useful. It lets you know if you are able to move the throttle to the wide-open position. It also shows you how little throttle you are using when running at cruising speed.

You can use this information to check on your throttle linkage to make sure you are reaching full throttle.

You can use this information to check on your boat's performance by comparing the ENGINE LOAD shown currently with that previously noted. For example, if you previously reached a certain cruising speed with an ENGINE LOAD of 35-percent, and you currently note that in order to reach the same cruising speed you have to advance the throttle to a point that shows ENGINE LOAD of 45-percent, you can deduce that there is something that has changed in the boat or engine performance.

You can use this information to check on the throttle linkage to make sure you are reaching minimum throttle.

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