REFLECTOR: Yet another taxi test!

[Scott Derrick]

John, thanks for your experience on oil cooling.   I figured  as much
but  confirmation is good to cut the worry factor down.

I think redline for the oil temp is 240F.  We routinely run the  520's
oil temps in T210's right at redline during summer departures out of
Phoenix and other hot locales. Course they aren't shut down when the oil
is still hot.  Maybe thats a factor?

I would have thought high cht's could cause broken rings..

I'll keep an eye on the oil consumption.

Scott

aminetech at bluefrog.com wrote:
> --- scott at tnstaafl.net wrote:
>
>
>
> 1.)  high oil temps?  Should I expect that when doing these taxi tests? 
> I know if I had actually taken off, the nose oil cooler would have
> really started to work with the higher air speed...  Anybody else see
> similar temps when taxi testing with a already hot engine?  I have to
> say I have a fan driven secondary oil cooler which I neglected to turn
> on until right before the last run.  Needs to be added to my checklist!
>
> I have basically no cooling during taxi.  If the engine and oil are cold I have plenty of time to get in the air before CHTs and oil get too hot.  When the engine is warm, I try to get in the air asap (run-up while taxiing).  I have blowers for the oil cooler and the engine and always use them on the ground when the engine is warm.  That buys me some time, but temps still climb.  240F = 115 C. My oil has been that hot only once after a long taxi after landing at OSH.  This resulted in broken rings in the two rear cylinders.  Hopefully you don't have that problem.  High oil consumption will be the indicator.
>
> John
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