Head shake - what's up with it?

[reflected]

Does the durbulence go away when I throttle back? I don't think so.

It's mostly noticeable at higher altitudes. Mixture? If it's not properly set up then it's a bug, because teh Spitfire is supposed to have AUTOMATIC mixture. Maybe it has something to do with what you said about planes not reaching their ceiling. Perhaps the mixture is bugged?

[Raggz]

It's either mix, prop/torque settings. It also shakes when engine is close to overheat.

[SQB]

Most common cause of this is improper radiator management.

Keep in mind, even if the radiator is in the open (cool) position when you spawn, the engine treats it as closed, "close" and open it again to keep the engine temp down. Open it all the way and it should never come back but you will limit your top speed.

Also, if you right click and create a new window then alt-right click on that and move "engine" and "vehicle damage" to the left column then press ok, you will have a window that tells you any problems, VERY useful!