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Dynon, tachs, transducers, pulses and more oh my

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vshimsl(at)live.com
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Posted: Mon Oct 19, 2009 8:49 pm Post subject: Dynon, tachs, transducers, pulses and more oh my

Hello C



After exhaustive searches C I broke down and read my Lycoming manual. I know C like asking for directions and admitting you're lost.



I have a Van's tachometer transducer connected to a Dynon D-180. Now the transducer puts out 8 pulses per revolution but I C like most C had to set it at 3.5 or 4. Why? 



Well... the Lycoming manual clearly (when actually read) states that the tach transducer output gear turns at a .5/1 ratio. In other words when the engine rotates once C the tach transducer output rotates 1/2 turn. If you set your Dynon tachometer input to 8 pulses/rev C you will get half the RPM. 



Doing the math:(.5 Trev/Erev) x (8 pulses/Trev) = 4 pulses / Erev which is where most of us have been setting the Dynon using trial and a lot of error.



Trev= tach port rev

Erev= engine rev

pulses= transducer pulses.



Hence the 4 (some 3.5) pulses per engine revolution. Again only a comparison with a calibrated tach (tru-tach) will let you know for sure how close you are.



Now if I am wrong C don't tell me for it appears to be working.



Vince H.

RV8 N8432 20 hours and 'climbing'



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