Any one have a solution to high tachometer readings on a newly installed Dynon Skyview? When I run the engine to takeoff power I get good rpm readings, compared to my Rotax tachometer, until I get to about 4800 rpm then the Skyview tac reads very high and fluctuating rpm. Readings are 7,000 to 8,000+ rpm. Dynon had me add a 60k resister which helped dampen the fluctuations, they are slower, but I still get the high readings at takeoff power. My Rotax tach reads 5700 rpm and steady. I connected to the "high voltage" pin on the EMS as per instructions from Dynon. I believe I am connected to the correct pin on the TCU. I have a toggle switch setup to read the Rotax tach or the ems tack. I am running an Airmaster constant speed propeller and electronic control unit.
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Re: high and erratic rpm indication on my dynon skyview on a 914 ul
by Ken Ryan » 4 years ago
Have you selected "Rotax 912" as the Engine Type? That is the correct selection. Do not select "Other."
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Re: high and erratic rpm indication on my dynon skyview on a 914 ul
by James Ott » 4 years ago
You probably need the inline resistor on the tach sense line. I believe the install instructions are on the Dynon and/or the Rotax installation manuals. Many of us have had to do this for exactly the symptoms you describe.
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Re: high and erratic rpm indication on my dynon skyview on a 914 ul
by Steve Hirschi » 4 years ago
Thank you for your help.
I inserted 60K of resistance in the tack sense wire, checked for the correct connection to the Dynon EMS module, and changed the engine type to Rotax 912, did a run up yesterday and I am still seeing the same symptoms. Any thing else I could try. Dynon is stumped also.
