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Tach problem

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zsmith3rd(at)earthlink.ne
Guest

Posted: Thu Mar 09, 2006 5:01 am Post subject: Tach problem

This may NOT be a cure.



A previous installation of my 912 had a tach problem....found that the bundle of wire from engine to firewall, including Oil Temp, Oil Press, CHT, Tach, etc, was "near" the top left rear spark plug wire.  "Near" in this case was about 3mm (three millimeters), a mistake by the builder.  



There was enough induced voltage from the plug wire, at various RPM settings, to interfere with the AC being sent to the tach that the whole mess was totally un-reliable.  The pulses to the plug added "extra" pulses to the tach leads, or were exactly in phase at times and had a cancelling effect on the tach pulses.  Whatever.  It didn't work.

  

Moved/separated stuff in the bundle.  Cured the problem.  



All cases are different, results not typical, batteries not included, some assembly required, consult your doctor.



do not archive



Regards,



Zed/701/912/905/etc

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