On mine, all turning the key does is unground the p-leads on the mags (I need to push the starter button to
get the prop to turn). How does turning the key on induce 'the worst temperature shock'? ;-)

Bill Hale wrote:

(Malcolm Teas) wrote in message . com...
"Jay Honeck" wrote in message news:QdQZb.376650$na.567800@attbi_s04...
In another thread (about cold starting) it was mentioned that Alaskan bush
pilots routinely drain their oil, take it inside, and heat it on the stove
before starting in the morning.

Getting back to the subject, one might surmise that by
far the worst temperature shock happens to the engine
when the key is turned on.

One should avoid this action.

Bill Hale

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