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I-Command Gauge ENGINE LOAD
|Author||Topic: I-Command Gauge ENGINE LOAD|
posted 11-08-2008 10:55 AM ET (US)
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?
posted 11-08-2008 06:00 PM ET (US)
Tom--I-Command displays engine load as a percentage of throttle.
posted 11-08-2008 09:03 PM ET (US)
"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.
posted 11-08-2008 09:38 PM ET (US)
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.
posted 11-08-2008 10:22 PM ET (US)
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.
posted 11-08-2008 11:53 PM ET (US)
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.
posted 11-09-2008 07:27 AM ET (US)
Thanks Bob, it could have been labeled percent throttle and that would be very clear.
posted 11-09-2008 09:55 AM ET (US)
Moved to SMALL BOAT ELECTRICAL for further discussion.
posted 11-09-2008 10:02 AM ET (US)
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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