[Diy_efi] RE: Timing and dyno pulls

[Grant Beaty]

Ah, so its all from the better transfer from engine -> coolant.

I already knew that heat transfer is proportional to delta T ;) I was
talking about pressure alone.

Grant "Not THAT dumb" B.

----- Original Message -----
From: "Adam Wade" <espresso_doppio at yahoo.com>
To: <diy_efi at diy-efi.org>
Sent: Monday, December 23, 2002 1:54 PM
Subject: Re: [Diy_efi] RE: Timing and dyno pulls


> --- 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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