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Oil temp vs Cyl temp on Lyc O320

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planebuilder

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I flew with a guy who just bought an airplane with a "new" glass panel. O320 ,carb, FP Prop, standard oil cooler for type, has ~600 trouble free hours on the aircraft.
The oil temp stays at 190 even on long slow high power climbs.
The CHT indicates 445-450 on 3 cyl and 475 on the 4th.
My hunch is that the CHT readings are wrong, maybe a calibration issue.
Wouldn't oil temp also be high if CHT was too high?
Or can oil temp be normal when CHT is high?
 

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