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Which, of course, is the theory of the various 'water wetter' products.
I tried (the original, I think) Water Wetter from Redline and didn't
notice a significant reduction in coolant temp; but, I've got a bottle
of the Dynolite version on the shelf I'll throw in the next time I
change out coolant. As they say: "Hope springs eternal."
On 2/24/2022 8:30 AM, Michael Salter wrote:
> Interesting article Bob but IMHO their statement:
> "Pressure in a cooling system is vital for keeping water in contact
> with the metal surfaces of the cylinder heads and block."
> is something of an over simplification.
> The reality is that any "boiling " of the coolant produces a "bubble"
> of gaseous coolant, there is no air, as such, involved.
> Their statement :
> "Pressure keeps the air compressed and maintains the water-to-metal
> contact. "
> suggests that the cooling system contains air; it shouldn't contain
> any air, other perhaps the very small quantity disolved in the coolant.
> Pressurizing the cooling system raises the boiling point. Raising the
> boiling point means that the temperature of the engine surfaces where
> gaseous coolant will be generated will also need to be higher for
> boiling to occur.
> As the rate of heat radiation from the cooling surfaces is
> proportional to the 4th power of the absolute temperature there is
> also a considerable increase in the amount of energy that can be
> dissipated by the radiator.
> These things together make pressuring the cooling system even to only
> 7 p.s.i. very advantageous.
> As I mentioned earlier the problem with the 100 insofar as cooling
> system pressure is concerned is the carbon seal in the water pump and
> perhaps the design of the radiator tanks.
>
> M
>
>
>
> On Thu., Feb. 24, 2022, 10:42 a.m. Bob Spidell, <bspidell@comcast.net>
> wrote:
>
> I was about to jump in and say "But, but, but .... pressure only
> raises
> the boiling point but, for once, I did some 'research' first:'
>
> "Pressure in a cooling system is vital for keeping water in
> contact with
> the metal surfaces of the cylinder heads and block."
>
>
> https://www.motortrend.com/how-to/understanding-the-cooling-system-cool-under-pressure/
>
>
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Which, of course, is the theory of the various 'water wetter'
products. I tried (the original, I think) Water Wetter from Redline
and didn't notice a significant reduction in coolant temp; but, I've
got a bottle of the Dynolite version on the shelf I'll throw in the
next time I change out coolant. As they say: "Hope springs eternal."<br>
<br>
<br>
<div class="moz-cite-prefix">On 2/24/2022 8:30 AM, Michael Salter
wrote:<br>
</div>
<blockquote type="cite"
cite="mid:CAB3i7LKwSJu4W+eLRdT92K3K2ko2vP7NBnRQkJ8tZ5Dwo86X=Q@mail.gmail.com">
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<div dir="auto">
<div dir="auto">Interesting article Bob but IMHO their
statement:Â
<div dir="auto"><span style="font-size:12.8px">"Pressure in a
cooling system is vital for keeping water in contact with
t</span><span style="font-size:12.8px">he metal surfaces
of the cylinder heads and block."</span><br>
</div>
<div dir="auto">is something of an over simplification. <span
style="font-size:12.8px"><br>
</span></div>
<div dir="auto">The reality is that any "boiling " of the
coolant produces a "bubble" of gaseous coolant, there is no
air, as such, involved. </div>
<div dir="auto">Their statement :</div>
<div dir="auto">"Pressure keeps the air compressed and
maintains the water-to-metal contact. "<br>
</div>
<div dir="auto">suggests that the cooling system contains air;
it shouldn't contain any air, other perhaps the very small
quantity disolved in the coolant.</div>
<div dir="auto">Pressurizing the cooling system raises the
boiling point. Raising the boiling point means that the
temperature of the engine surfaces where gaseous coolant
will be generated will also need to be higher for boiling
to occur.</div>
<div dir="auto">As the rate of heat radiation from the cooling
surfaces is proportional to the 4th power of the absolute
temperature there is also a considerable increase in the
amount of energy that can be dissipated by the radiator. </div>
<div dir="auto">These things together make pressuring the
cooling system even to only 7 p.s.i. very advantageous. </div>
<div dir="auto">As I mentioned earlier the problem with the
100 insofar as cooling system pressure is concerned is the
carbon seal in the water pump and perhaps the design of the
radiator tanks.</div>
<div dir="auto"><br>
</div>
<div dir="auto">M</div>
<div dir="auto"><br>
</div>
<div dir="auto"><span style="font-size:12.8px"><br>
</span></div>
</div>
<br>
<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">On Thu., Feb. 24, 2022,
10:42 a.m. Bob Spidell, <<a
href="mailto:bspidell@comcast.net"; rel="noreferrer
noreferrer" target="_blank" moz-do-not-send="true"
class="moz-txt-link-freetext">bspidell@comcast.net</a>>
wrote:<br>
</div>
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">I was
about to jump in and say "But, but, but .... pressure only
raises <br>
the boiling point but, for once, I did some 'research'
first:'<br>
<br>
"Pressure in a cooling system is vital for keeping water in
contact with <br>
the metal surfaces of the cylinder heads and block."<br>
<br>
<a
href="https://www.motortrend.com/how-to/understanding-the-cooling-system-cool-under-pressure/";
rel="noreferrer noreferrer noreferrer noreferrer"
target="_blank" moz-do-not-send="true"
class="moz-txt-link-freetext">https://www.motortrend.com/how-to/understanding-the-cooling-system-cool-under-pressure/</a><br>
<br>
<br>
</blockquote>
</div>
</div>
</blockquote>
<br>
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