> Or would the faster cooling make the heads crack worse. I do like the >idea of circulating the coolant after a hot run but only so the engine >does not heat up more than operating temp just after shut down. I >wonder how much hotter the head gets after shut down.
I have a little data on that. After a several long hard run in hot weather with the A/C on the temp. guage runs at about the point where the radiator fan switches on (around 85 deg. C?) I have stopped the van after a short (30 seconds or so) cooldown. When I re-started the engine after 5 minutes or so (you know, the stop for gas in the middle of the desert situation), my aftermarket head temperature alarm (which comes on around 110 C) came on for a few seconds. I can only assume that it would have been even hotter if the starting temperature had been higher or if I had switched the engine off immediately. Bill
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