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Date: Wed, 07 Mar 2012 12:09:36 -0500
From: Ernest Christley <echristley@att.net>
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To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Subject: Re: [FlyRotary] Re: Ground Cooling
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Chris Barber wrote:

> Again, I may be creating a problem that does not exist since this is all
> fretting about stagnant air on an engine that has a load on it on the
> ground, but I do wish to try to best understand it better.

>From earlier:
>I have two fans pulling air through the heat exchanger and the radiator area
>where the fans are is cool to the touch with the fans on right after
>shutdown.

If the engine is hot after a run, but your radiators aren't, you definitely have a problem.  I'm using an electric water
pump, allowing me to play around with cooling rates a bit.  For my tuning runs, I would have a blower on the cooler
intake, insuring airflow across the radiator.  After shutdown, I would then turn the water pump off for a bit and let
the water in the rad cool.  Switch the pump back on, and watch the thermostat.  It took a fairly long time to create a
5* dip as the cooled slug of water reached the temp sender.

If you get out of the plane after hitting 200* water temps and put your hand on the radiator right after shutdown...I
would say you don't have engine heated water going through the rad.