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High RPM Warning at 4000

The Dynon EMS system suddenly went from green to red and alerted me to an overspeed condition at 4000 RPM. I landed as soon a practicable and found all other conditions normal. Decided to continue my trip and RPM went from green to red to green to red over the 3 hour trip. No other noticeable changes.

Any thoughts?

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Permalink Reply by Duane on March 11, 2011 at 16:37

Dave,

If you decend quickly and/or the ambient air temp is low, your oil temp may drop below 122 degrees F and if it does, you will get a warning of high RPM over 2500 RPM. This happened to me when ATC had me lose altitude rapidly when it was already on the edge if I needed the oil cooler cover. I was suprised by the high RPM warning myself.

Duane

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Permalink Reply by Dave Fisher on March 12, 2011 at 19:28

I have installed the cold weather baffles and have not seen the problem again.

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Permalink Reply by Duane on April 5, 2011 at 20:21

Dave,

I am not sure when it would be appropriate to install the coolant cover. It seems that with a thermostat in the coolant system, it would only be needed in extreme cold conditions.