[Diy_efi] RE: Timing and dyno pulls

[Grant Beaty]

> Er, check your math.  It would gain a hundredth of
> that.

Well, whatever the case is (that was salt water anyways), it expands enough
to push out coolant into the overflow. Hence the "hot" and "cold" markings.
I am only familar with Supras and DSMs, but given that both those engines
can support power levels about 3x their stock value, I'd say it works.

I remember reading about people measuring the diff. between hot 7 cold on
their overflow to determine if the HG was starting to go.

I understand if the pressure were to lower, the cap obviously cannot
regulate it, its just a relief valve. But if your cooling system is doing
its job (no overheating and/or boiling), pressure should be more or less the
same shouldn't it?

> I'd also point out that if your coolant never exceeds
> its boiling point at a given pressure and with the
> flow volume being X, then changing system pressure
> isn't going to make a difference in localized boiling.

Wouldn't it always exceed boiling temp in the localized hot spots of the
block? Obviously the total system temp shouldn't....

Grant

----- Original Message -----
From: "Adam Wade" <espresso_doppio at yahoo.com>
To: <diy_efi at diy-efi.org>
Sent: Tuesday, December 24, 2002 11:52 PM
Subject: Re: [Diy_efi] RE: Timing and dyno pulls


> --- Grant Beaty <gbeaty at ufl.edu> wrote:
>
> > A quick search revealed the expansion of seawater to
> > be 0.00021 % / C. So if the coolant went from 30 -
> > 100C, it would gain 1.4% volume,
>
> Er, check your math.  It would gain a hundredth of
> that.
>
> > or about a liter in my case (although I don't use
> > salt water for coolant ;)
>
> More like 10cc.
>
> If you are using up a liter of coolant out of an
> overflow tank, something very strange is going on.
>
> I'd also point out that if your coolant never exceeds
> its boiling point at a given pressure and with the
> flow volume being X, then changing system pressure
> isn't going to make a difference in localized boiling.
>
> =====
> | 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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