I instaqlled two 2 1/2 x 4" counter balanced flapper
valves on the top cowl of my 0-320 that close between
800-1000 rpm from plenum pressure. You'll be surprised
by the reverse thermal airflow at shut down.

Hurant Karibian

I have been thinking about heat soak for a while.  It
is not high priority, just something that has been on
the back burner.  Your solution seems so much more
eloquent than anything I came up with.  It is simple
and requires no pilot input.  Do you have any
drawings or photos?  What kind of plane is it on?
Can you see the flaps from the cockpit? What happens
to engine cooling if they stick open in flight?
--Sandy


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