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From: "Marvin Kaye" <marv@lancaironline.net>
Subject: Re: Idle power descent?
To: lml
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Date: Fri, 06 Jan 2006 01:30:29 -0500
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Posted for Lorn H Olsen <lorn@dynacomm.ws>:

  Jim,
  
  Back in the 70's, when I sold 421s, we were told that a sustained  throttle
reduction would cost between 20 & 50 hours of engine life. I  don't know if
the problem was shock cooling or cavitation.
  
  Have we also determined that letting the prop drive the engine  (cavitation)
is OK? When I hear the backfiring or whatever sound it  is, I give the engine
more gas.
  
  Lorn