Dave Plowman (News) wrote:
If you made two engines identical - apart from one having ally block and
head while the other cast iron - which would warm up fastest after a cold
start?

Air or water coooled?
Aluminium is a better conductor of heat, so presumably the coolant used
for the ally block would would warm up quicker. But if they were
air-cooled engines, heat would be lost quicker to the air from the ally
block.

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