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Marv,
I have seen 90C (190F) behind the baffling on my 320. This is why I have a blast tube for the Voltage regulator and vacuum pump. I use the "carb" temp probe of my VM system as a movable "cowl" probe. If it goes off scale, I'm jumping!
Frankly, I would use a temp probe with cockpit readout and a setable warning level device (oven temp control?). As usual, if it is well placed, a normal "under cowl" temperature range could be determined from experience and a too cold (leaking baffle? engine stoppage?) or too hot (summer heat soaking, FIRE!, etc.) would be intellegently dealt with.
Scott Krueger
N92EX
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