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#1
January 23rd 06, 12:01 PM
posted to rec.aviation.homebuilt,rec.aviation.owning
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O-320 3.5 crank speed vibration
Hi, I tried to balance a prop on a O-320 on a RV-6 the other day and could not because other large vibrations were present. Im summary, I got: 0.7 IPS at 0.5 crank RPM 0.2 IPS at crank RPM 0.5 IPS at 3.5 crank RPM The vibration levels at the other multiples of 1/2 crank were all relatively small. I can find lots of info on the web re 1/2 crank vibration and its causes but I can find nothing on 3.5 crank and I am puzzled as to why it is so high. Is it normal for this kind of engine? Thanks, Mark 
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