On Mon, 12 Jan 2015 08:54:23 +0000, harryagain wrote:

Glow plugs vapourise the fuel in the inlet manifold to make starting
easier when cold.

No, they don't.

Glow plugs aren't in the inlet manifold, they're in the combustion
chamber.
Diesel fuel isn't injected into the inlet manifold, it's injected
directly into into the cylinder or - on older indirect injection engines
- into pre-ignition chambers.
Diesel fuel is massively vaporised by the injectors, at a pressure of
tens of thousands of psi. Even cold.
Diesel fuel is IGNITED by combustion pressure alone and, when cold, that
needs a bit of warmth to help it get started.

THAT's what glow plugs do.

http://en.wikipedia.org/wiki/Glowplug

I would suggest you stick to expounding on subjects you understand, but
you'd probably be silent.