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Mechanics and Maintenance Shops

CHT in cold weather - C180

Roland Desmarais

HI,  I am wondering if my CHT are too low and if there is a way to increase CHT's.  We flew in ambient temperatures in -23º to -25ºC.
First flight (2.5 hours) no winter cover, however oil cooler was taped to increase oil temperature.  CHT hovered around 200º - 225ºF.  Carb heat was required to stay on almost 85% of the time.  Next day installed winter covers (ambient temp -23ºC).  CHT's increased slightly between 225º - 265ºF.  Carb heat was still required about 65% of the time.
Is this normal for Continental 0-470L in these temperatures?