Hey why does this happen? Just wondering

[Krt_Bong]

If you ever go to an Airshow and see an aerobatic display, when smoke is used it is usually injected from a separate tank directly into the exhaust, resulting in a nice thick blue-white smoke because it is hot and the smoke burns, in WWII Fighters a shot to the coolant tank could cause loss of glycol(coolant) which might caise a similar condition and the result would be engine overheat, and possibly fire especially if oil and fuel lines were severed and sprayed on hot manifolds and electrical connections.

[stansdds]

Smoke from a damaged engine is usually the result of an oil leak. Get enough oil leaking and burning and you can set the rubber fuel lines, ignition wires, and gaskets on fire. Once a fuel line is ignited, you have a really hot and big fire. At the time, engines, engine mounts, and wings are made of all sorts of materials. Steel, copper, brass and aluminum don't burn easily, but will melt. Magnesium, on the other hand, will burn with a white-hot intensity. Wing spars were sometimes made with magnesium, some engine parts such as oil sumps were also magnesium. Wing sections were often covered with canvas, which will also burn nicely.