EGT differential at low power

[Turtlesfly]

Thanks for everybody’s contributions on this forum, it is very helpful.

I have a question about how much EGT diff on an engine monitor would you or tolerate at low power before suspecting something is wrong?

Yeah yeah, I’ve read the advice (Mike Busch, etc…) that EGT diff is a meaningless number, but that can only be true up to a point.

The engine in question is for a Seneca II - Continental TSIO-360. At idle and up to about 1000 RPM I’m getting a few EGTs around 480-580 (is that even firing? I feel like that’s just measuring residual heat at that point), and some are at 1300, representing a spread of over 800 degrees. It even shakes the plane a bit. At cruise and higher power settings, the EGTs are tight and the engine purrs along, so maybe I shouldn’t be worried.


However, on short final yesterday I got a diff warning on the JPI of 200 as 2 cylinders dropped off the bottom scale of the monitor. A post-flight run-up revealed normal operation when they were under power.

Would this strike concern in anybody else?

Thanks.

 

[sgavette]

 

[skymark]

 

[Turtlesfly]

 

[N4655R]

 

[sgavette]

 

[N4655R]

 

[mona]

 

[sgavette]

 

[raymos]