But your quoting Wikipedia, the biggest fountain of ****** on the net, diesels require 3 things, fuel, compression and heat.
The fuel is compressed to the point at which the latent heat in the plug coil causes it to ignite, that is as simple as I can make the diesel cycle sound. It's also why diesels struggle to start if you just whip the key round when you jump in, the plug hasn't reached adequate temperature, sometimes they'll refuse to fire this way alltogether as the cold fuel coming in is cooling the element before the mixture is compressed.
I'd suggest you start racing Nitro RC cars and try to run one of those with a duff plug.
And it's not being undermined, it's knowing the subject and holding your ground, if I was wrong then I'd shut up, but as a designer I have to know how these things work.
Well, lets not start bringing the validity of Wiki into the argument here.
Plug coil, well no. cylinder. As air is compressed it gets hotter. The colder the air around, ie in the winter, the more difficult it is for the spontanious combustion to occur, hence the need for glow plugs.
I've 2 of the f n things and have just tested my theory by going out and starting up each one of them without leaving the usual time for the plugs to warm up. Immediate start on both, meaning the glow plugs are not a factor in the starting process. Remembering one has f***ed plugs.
Now to me that means, in warm conditions glow plugs are not necessary....
Alex, it's not about the plug reaching the adequate temperature, it's about the combustion chamber reaching the adequate temperature. Glow plugs are only needed in lower temperatures to get the cylinder up to spontaneous combustion temperature.
No great wish to race nitro cars and to be honest has nothing to do with this discussion...