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From: Walter Atkinson <walter@advancedpilot.com>
Subject: Re: [LML] Oil and warming up
X-Original-Date: Sat, 2 Apr 2005 07:53:50 -0600
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On Apr 2, 2005, at 7:31 AM, Mark Ravinski wrote:

Consider the stress when you cob in full power on a cold engine.=A0 =
There=20
is little or no airflow yet=A0and the flow of cooling oil is minimal.=A0=20=

The rapid heating will distort cylinders and change tolerances.
The Lycoming book says that if the engine responds to advancing=20
throttle smoothly it's warm enough to go.
Like other engine limits - this one borders on abuse.


Mark:

If you have any data to support that contention, I would really=20
appreciate seeing it.  I know of no such data and do not share your=20
concern.  As a matter of fact, waiting until the cylinders are a higher=20=

temperature before takeoff, only serves to end up with a hotter CHT=20
during initial climb. I'd rather keep the cylinders cool.  TCM,=20
Lycoming, Pratt & Whitney, and Wright all seem to agree with that.  I=20
think they're right.

Walter=

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On Apr 2, 2005, at 7:31 AM, Mark Ravinski wrote:


<fontfamily><param>Arial</param><smaller>Consider the stress when you
cob in full power on a cold engine.=A0 There is little or no airflow
yet=A0and the flow of cooling oil is minimal.=A0 The rapid heating will
distort cylinders and change tolerances.</smaller></fontfamily>

<fontfamily><param>Arial</param><smaller>The Lycoming book says that
if the engine responds to advancing throttle smoothly it's warm enough
to go.</smaller></fontfamily>

<fontfamily><param>Arial</param><smaller>Like other engine limits -
this one borders on abuse.



</smaller>Mark:


If you have any data to support that contention, I would really
appreciate seeing it.  I know of no such data and do not share your
concern.  As a matter of fact, waiting until the cylinders are a
higher temperature before takeoff, only serves to end up with a hotter
CHT during initial climb. I'd rather keep the cylinders cool.  TCM,
Lycoming, Pratt & Whitney, and Wright all seem to agree with that.  I
think they're right.


Walter</fontfamily>=

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