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Date: Sun, 06 Feb 2000 04:08:24 -0500
To: lancair.list@olsusa.com
From: Marvin Kaye <marvkaye@olsusa.com>
Subject: Re: RELIABILITY
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Posted for Rob Wolf <RWolf99@aol.com>:

In a message dated 2/5/0 9:45:47 PM, you wrote:

<<The idea is to stress the engine as hard as possible to detect any 
developing weakness>>

Do you do your run-ups at full RPM also?  Seems to me that's in keeping with 
your philosophy.  And if you think you're operating the engine in a manner to 
cause it to fail, I have to ask why you're doing it?  Wouldn't you rather 
take off at a lower setting and push it up to 100% at 1000 feet altitude?

Didn't think so.

Parts with a fatigue life are designed by derating the allowable material 
stress to account for the cyclic loading on the part.  For an engine that's 
easy.  2500 RPM times 2000 hours tells you how many loading cycles will be on 
every part.  I don't think that running the engine at an economy setting will 
prolong the life of pistons, connecting rods, and the like due to a reduced 
number of stress cycles.  I think that a much stronger factor is excessive 
temperatures at higher power settings, and you protect against that by having 
your cooling system up to snuff.

These things are designed to run at full power for takeoff and climb.  Don't 
be afraid to use it.  Of course, you could install an O-360 and run it at 
lower power settings, pretending it's only an O-320...

- Rob Wolf


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