[Diy_efi] RE: Timing and dyno pulls

[Adam Wade]

--- Grant Beaty <gbeaty at ufl.edu> wrote:

> So higher cooling system temp helps heat transfer
> from coolant -> radiator as well as engine ->
> coolant?

Yep.  That's physics for ya.  ;)  The larger the
differential between two temperatures, the faster the
heat transfer.

Fourier's Law: The heat flux resulting from thermal
conduction is proportional to the magnitude of the
temperature gradient and opposite to it in sign.

Since the thermal conductivity between a radiator's
metal and the air is the lowest thermal conductivity
of anything in the circuit, increasing coolant temps
by pumping more heat into the system from the cylinder
head WILL result in an increase in coolant temps,
because getting the heat out to the air is the
"hardest" part of the circuit.  But higher coolant
temps will shed more heat to the air than lower
coolant temps, and the opposite is also true for air
temps; it's the differential.  IT's also one of the
reasons vehicles are more likely to boil over in hot
weather, and why some people put cardboard in front of
part of their radiator in cold weather (although if
their thermostat is working properly, that's not
really necessary).

=====
| Adam Wade                       1990 Kwak Zephyr 550 (Daphne) |
|   http://y42.photos.yahoo.com/bc/espresso_doppio/lst?.dir=/   |
| "It was like an emergency ward after a great catastrophe; it  |
|   didn't matter what race or class the victims belonged to.   |
|  They were all given the same miracle drug, which was coffee. |
|   The catastrophe in this case, of course, was that the sun   |
|     had come up again."                    -Kurt Vonnegut     |

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