[agirard7a]

This video is very informative and well done.
When you have some time to kill check it out.

The best anology: "we don't have a choke on our airplanes"
Effectively, full rich acts as a choke at start up.

The EGT curve and running the engine between lean
Economy and richer max HP while not exceeding 400 deg.
On the CHT, spells it all out.

My question and yet to get my head around the issue.
Why other than start up, would you want to run full rich beyond
Max HP (100 deg rich of peak EGT)?? Especially on take off when you want
Max HP. The only thing I can think of is that full rich keeps the cylinders cooler on
climb out. Can anyone elaborate on this?

http://www.eaavideo.org/video.aspx?v=1678859198001

 

[Brantel]

The simple answer is to keep you out of the Red zone and increase the margin for no detonation.

Engine guru's will be along shortly to give the long answer.