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I'm trying to diagnose the cause of  problem  that on  my home build VK-30 with 914 F2 engine variable speed propeller 

1. Airbox temp goes up to 92 C to 95 C and all other parameters are NORMAL, like  oil temp, CHT, EGT etc.

RPM was 5000 ~ 5500 with no drop  or any vibration issue gain height 12000 feet to 16000 feet.

as per book, Airbox intervene at 88C. but here no such action was found. why?

 

 

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