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I read the reply and my first response was, "don't you want the water to
pick up more heat in the engine so it can shed it in the radiator?" Then I
thought some more, I think the point is higher flow gives you closer to
equilibrium, rather than hotter water in the engine and cooler in the
radiator, and since the engine is the hot spot the closer you can get to
equilibrium on the temp the better??
Greg Lemon
TR250 (which has always run between the little dots in the middle of the
gauge once warmed up, so my interest is purely acedemic)
On Sun, Jul 28, 2019, 6:35 PM dave <dave@ranteer.com> wrote:
> In the last few weeks there was some discussion about the new vs old water
> pumps. Someone postulated that the newer water pumps move water faster
> through the radiator, which results in less cooling and a hotter engine. I
> asked my nephew, a mechanical engineer who is also a car person, about
> this. here is his reply:
>
>
>
> I think the point of confusion is the notion that increasing flow rate is
> a bad thing. I get the basic thought of it spending less time in the
> radiator but it's one of those things that sounds correct without having
> any real science to back it up. One of the rules of thermodynamics is that
> flow rate and heat transfer are directly proportional. If you increase flow
> rate and all other things remain constant then you will reduce temperature.
>
>
>
> For your specific use case, you're improving the efficiency of cooling
> because the fluid is moving more quickly through the engine. It's better to
> keep fluid at as low of a temperature as possible and moving it very
> quickly means that each molecule is exposed to the heat for less time. When
> it gets to the radiator there isn't as much heat to be removed so spending
> less time in the radiator becomes a moot point.
> ** triumphs@autox.team.net **
>
> Donate: http://www.team.net/donate.html
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<div dir=3D"auto">I read the reply and my first response was, "don'=
;t you want the water to pick up more heat in the engine so it can shed it =
in the radiator?" Then I thought some more, I think the point is highe=
r flow gives you closer to equilibrium, rather than hotter water in the eng=
ine and cooler in the radiator, and since the engine is the hot spot the cl=
oser you can get to equilibrium on the temp the better??<div dir=3D"auto"><=
br></div><div dir=3D"auto">Greg Lemon</div><div dir=3D"auto">TR250 (which h=
as always run between the little dots in the middle of the gauge once warme=
d up, so my interest is purely acedemic)</div></div><br><div class=3D"gmail=
_quote"><div dir=3D"ltr" class=3D"gmail_attr">On Sun, Jul 28, 2019, 6:35 PM=
dave <<a href=3D"mailto:dave@ranteer.com";>dave@ranteer.com</a>> wrot=
e:<br></div><blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;bo=
rder-left:1px #ccc solid;padding-left:1ex"><div lang=3D"EN-US" link=3D"#056=
3C1" vlink=3D"#954F72"><div class=3D"m_-8862082340982648424WordSection1"><p=
class=3D"MsoNormal">In the last few weeks there was some discussion about =
the new vs old water pumps.=C2=A0 Someone postulated that the newer water p=
umps move water faster through the radiator, which results in less cooling =
and a hotter engine.=C2=A0 I asked my nephew, a mechanical engineer who is =
also a car person, about this.=C2=A0 here is his reply:<u></u><u></u></p><p=
class=3D"MsoNormal"><u></u>=C2=A0<u></u></p><p class=3D"MsoNormal">I think=
the point of confusion is the notion that increasing flow rate is a bad th=
ing. I get the basic thought of it spending less time in the radiator but i=
t's one of those things that sounds correct without having any real sci=
ence to back it up. One of the rules of thermodynamics is that flow rate an=
d heat transfer are directly proportional. If you increase flow rate and al=
l other things remain constant then you will reduce temperature.<u></u><u><=
/u></p><p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p><p class=3D"MsoNormal=
">For your specific use case, you're improving the efficiency of coolin=
g because the fluid is moving more quickly through the engine. It's bet=
ter to keep fluid at as low of a temperature as possible and moving it very=
quickly means that each molecule is exposed to the heat for less time. Whe=
n it gets to the radiator there isn't as much heat to be removed so spe=
nding less time in the radiator becomes a moot point.<u></u><u></u></p></di=
v></div>** <a href=3D"mailto:triumphs@autox.team.net"; target=3D"_blank" rel=
=3D"noreferrer">triumphs@autox.team.net</a> **<br>
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errer" target=3D"_blank">http://www.team.net/donate.html</a><br>
Archive: <a href=3D"http://www.team.net/pipermail/triumphs"; rel=3D"noreferr=
er noreferrer" target=3D"_blank">http://www.team.net/pipermail/triumphs</a>=
=C2=A0 <a href=3D"http://www.team.net/archive"; rel=3D"noreferrer noreferrer=
" target=3D"_blank">http://www.team.net/archive</a><br>
<br>
hs/grglmn@gmail.com" rel=3D"noreferrer noreferrer" target=3D"_blank">http:/=
/autox.team.net/mailman/options/triumphs/grglmn@gmail.com</a><br>
</blockquote></div>
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** triumphs@autox.team.net **
Archive: http://www.team.net/pipermail/triumphs http://www.team.net/archive
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