Not to belittle anyone’s knowledge, but
A diesel compresses air only and the air has to get hot enough in the combustion chamber to ignite the diesel fuel that is sprayed into the combustion chamber at TDC (approx).
That is pretty hot!
If you ever tried to light diesel fuel cold, it takes a while, to say the least.
That is why it is important that the glow plugs are really hot to heat the incoming air to assist the heating done by compression.
In the old days some manufactures recommended using kero or #1 diesel in the winter, as we know it ignites easier.
I use to hear the guys talk about heating the intake manifold with a cutting torch on the construction sites to get them going. Or a lit rag soaked with gasoline held over the intake.
Guess we got it pretty easy with glow plugs!
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