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PA31 310 Navajo - how do you run your engines?

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DClarkson

Member
Joined
Apr 7, 2017
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In the cruise I aim for cht of 400 degrees, and try to use the power settings for 65% set out in the POH. My max accepted cht is 420 Degrees (and I have become increasingly accepting of 420 degrees). I have a Garmin 600 TXi with EIS but for no good reason other than I am not sure of my understanding of how it all fits together, I am very hesitant to use the lean assist function, either to find ROP or LOP. Therefore I guide all my engine settings on getting CHT to below 420 degrees primarily adjusting mixture to achieve this rather than cowl flaps that kill the speed.

I have tried reading all the red box/red fin stuff but seem to have a mental blind spot in understanding it all and my main takeaway is power <65% (you can do less harm here) and CHT management are key to engine longevity.

How do others operate similar engines and are my procedures gonna kill my engines? Should I be using the lean assist function?
 

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