[Vwdiesel] Engine state

[Mark Shepherd]

If I go for a short run in my car say 1 mile and stop do
some shopping for 20 25 minutes; I can start my car without
glowplugs. Outside temps between 3 and 8 deg C.
Does this tell me anything about my engine? I felt blowby a
little high but reduces under increased revs.
I've spent the last few days trying t owork out temps
created by compression. Looks like it could reach 800 deg C
assuming no heat losses to bores/head.
How much glow does a plug need to help ignite the diesel?
If the bores were insulated maybe we wouldnt need GPs at
all...
 Ceramics?
Miser