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Old 11-23-2021, 12:43 AM
  #59  
hendrix
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Join Date: Aug 2003
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Ahhh that explains it nicely, i also did the following test, i measured the spin down time while the turbine is oriented in different axes with wd40 lubrication only and spinning it by hand.
I took one measurement with the compressor looking up, then another with the compressor looking down and another with the turbine level and i found that when the compressor is facing down the spin time is definitely shorter, there a bit more friction.
My only explanation is that the weight of the shaft assembly adds to the preload because nothing is loose or missing.
I can't wait to test the AMT bearings (GMN actually) with he brass cage, from what i have learnt so far they should work very well...
Chris

Last edited by hendrix; 11-23-2021 at 12:50 AM.