My 912 ULS 3 does not not have any temperature issues on hot days under full throttle in a climb, but both CHT (coolant) and EGT increase rapidly when the throttle is reduced for descent and entry into the circuit. Temperatures just as quickly decrease if the power is either reduced to idle or increased to a normal cruise setting. This makes it difficult when there are other aircraft in the circuit and you need to reduce to a moderate power setting for separation and landing. I am running a 3 bladed MT propeller with a constant speed unit. I am wondering if the combination of engine and prop is causing some form of back-pressure that is inhibiting the flow of air through the radiator. Has anyone encountered this problem or have any suggestions?
