Mag Check in Flight

[Bob Cook]

This does not make a lot of sense.

down side : possible "backfire" or detonation.

upside: you can find a problem with a mag or cylinder and help isolate a problem......... especially if you have an engine monitor.

I do not see any harm. You will see an increase in CHT and EGT which is normal so make sure you are running well ROP if possible to avoid possible damage. I believe it delays the fuel burn causing an apparent "leaness".

bob