Rodger Hilyard wrote:

You don't have rods, valves and pistons jerking up and down, coming to a
complete stop and starting up in the other direction twice per rev.

     But you do have apex seals which DO have an oscillatory motion at
twice per rotor revolution...
......and if the New 3 millimeter apex seals are more massive  than the older
narrow seals you may see chatter marks after a few hours.... $0.02 worth

They only oscillate if the housing is not perfect. In theory they do not move
relative to the apex seal slot. Use ceramic apex seals. They are less than half
the weight of cast iron and they don't wear.

Paul Lamar
 
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