EGT Drop

[Tasmag]

What do the brains trust think of the attached pic.

 

This is a Jabiru Gen4 - unleaned.

 

It shows that the EGT on No6 starts at highest for full power, and then drops to lowest when pulled to cruise setting. At the same time No6 CHT, which is the blue line at bottom of page, that starts high and drops to the lowest.

 

I am thinking that No 6 is running lean-ish at all times and then really leans away when power is reduced.

 

The chart also shows later in the flight (yellow circle) where No6 does the opposite to the other cylinders at different power settings.

 

Induction leak maybe?

 

Mike

 

 

 

 

[facthunter]

You could be right. Pressurise the muffler and spray some very soapy water around the joins. At full throttle your MP is close to ambient and the leak(s) are less then. They are MAX at idle and if they are big enough the particular cylinder will probably misfire. or even not fire at all. Check exhaust pipe temp at start up..Nev