|
Mhhh.
Maybe you are right, but in THEORY the warm-air-blower-through-the-lower-grill has some advantages over oil pan or cooling water heaters:
- behind the grill is the water cooler => gets heated. Heat transfer should be great, after all this is an air-water heat exchanger.
- the engine bay is reasonably encapsulated, so the warm air has some time to heat things up before escaping.
- not only the cooling water and the motor block get warmer, also things like transmission and other add-ons will be pre-warmed a little, which helps reduce friction.
Heat transfer IS a question since air is not a good heat carrier. On the other hand, an engine compartment at 0°C or lower provides a steep gradient for air at 40-50°C, so a decent heat flow should be achieved. After all, we are not talking about a blazing hot engine when departing, just about prewarming everything a bit.
I will give this a try since it will surely not make things worse. If it is of no use, I can still let it be :-)
so long,
tinduck
__________________
|