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#13
January 23rd 06, 08:24 PM
posted to rec.aviation.homebuilt,rec.aviation.owning
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O-320 3.5 crank speed vibration
Bingo! I have just determined that the strip of metal I used to mount the sensor to the front of the engine has a resonant frequency (with the sensor attached (of course)) around 95 HZ which is very close to the frequency of the spike I was seeing. I think that solves the mystery of the 3.5 crank vibration. Many thanks to those who replied, I learnt something today! Mark 
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