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Permalink Reply by Paul Hammond on May 2, 2011 at 6:12pm

G'Day. My dynon does the same goes a bit eratic , cruise is fine, high rpm and low rpm are a little weird .But while the big fan up front keeps going round i dont care

paul

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Permalink Reply by Mack P. Kreizenbeck on May 2, 2011 at 8:03pm

Had similar problem myself, but it was quit a while ago, so can't remember which offending wire it was.

Go back and recheck the wiring schematic & directions -- make sure that everything is wire correctly.

I had one two many wires hooked up -- disconnected it and everything went well afterward.

Mack

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Permalink Reply by Robert E Pickens on May 2, 2011 at 9:01pm

My Tack drops off to zero when idle speed goes below 800RPM. UMA told me that is normal when using a lighting lead. The only other problem I have is that it is almost impossible to read the hour-meter, the hundredth's and tenth's, the red digits do not show up very well The magnifying lens is worthless. I am considering a separate hour-meter.     Bob Pickens, Troy, Mo.

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Permalink Reply by Bob McDonald on May 3, 2011 at 5:45am

Try a "Tiny Tach" from Aircraft Spruce. Attach to panel with velcrow tape, then simply wrap the wire lead a few times around a single spack plub lead wire. ..."installation complete". Tiny Tach shows engine rpm digitally when engine running and then show "HOBBS" time when engine shutdown. Cheap, simple and works great. I used one for 10 yrs and never had an issue. Available in 2-stroke & 4-stroke models.

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Permalink Reply by Felipe Uribe Posada on May 2, 2011 at 10:09pm

Many thanks to all for your comments.

I agree with Robert on the lousy hour meter, but it will have to do as is. Robert, When you say lighting lead, the tach conects to which of the two leads on the coil, the one going to the switch or to the one going to the distrtibutor?

 

I will also do what logic and Mack sugests, check the conector  to discard faulty wirings.

best regards,

 

 

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Permalink Reply by Robert E Pickens on May 2, 2011 at 10:59pm

I connected the "signal input" to one, either, of the wires from the alternator and ahead of the voltage regulator per UMA instructions on "Engine Connections" for a Jabiru engine.        Bob Pickens

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Permalink Reply by Ian McClelland on May 3, 2011 at 1:40am

I found that connecting to a coil wire did not work well. A alternator wire is better. I suspect using the Jabiru pickup off the flywheel would be the best option. I have not tried that method yet though.

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