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From: "Gary Casey" <glcasey@gte.net>
To: <lancair.list@olsusa.com>
Subject: LOP operation
Date: Mon, 4 Feb 2002 05:05:20 -0800
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          <<<<<<<<<<<<<<<<--->>>>>>>>>>>>>>>>
          <<  Lancair Builders' Mail List  >>
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>>
<<My question is how can we get away with LOP for
2000 hrs. of continuous high power operation
without burned leaky exhaust valves?>>

Certainly a legitimate question (high exhaust temperatures + excess oxygen =
burned valves), but there are lots of engines that run at high load LOP.
All diesels run "LOP" and the new Cummins engines have a design life of
10,000 hours running manifold pressures of about 3 atmospheres (that's 90
inches!).  Also, stationary natural gas engines run similar loads and they
are spark ignition engines that run LOP for their whole life, often for
about a year between shut-downs.  All you can hang your hat on is that the
exhaust valve life is very sensitive to the actual metal temperature of the
valve itself, and that will be lower LOP than at peak.

Gary Casey
ES project


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