rec.autos.simulators

And So It Begins...

Roger Squire

And So It Begins...

by Roger Squire » Tue, 22 Apr 2003 12:13:42

I finished the prep for my own watercooling project and system upgrade, just
waiting on the cpu to arrive tomorrow.  My specs are:

Abit NF7-S  v2.0  with vdd and vdimm mods
1700+ JUIHB
Geil PC3500 2x256
Maze3 waterblock, aquarium pump and radiator

I'm hoping for great results !

rms

Roger Squire

And So It Begins...

by Roger Squire » Tue, 22 Apr 2003 12:21:42

BTW, you mention your pump spec as having a high GPH.  One site I've seen
recommends the pressure rating as having more importance than the GPH.

rms

John Simmon

And So It Begins...

by John Simmon » Thu, 24 Apr 2003 06:21:18



Flow is king. The water carries the heat away. You want a system with
as little resistance as possible.  My pump may not even have enough
GPH balls to do what I want to do.

Luke Phillip

And So It Begins...

by Luke Phillip » Thu, 24 Apr 2003 17:31:54

Like anything with engines tho, if it flows too fast it doesnt have enough
time to extract the heat off the cpu. Production racing they will often cut
down water pumps on the car to slow the speed of the water because they were
ment for slow driving with low revs around town..

Cool Hand Luke
-=87=-






> > > What are your current system specs, and why is it running so hot that
it
> > > needs all that money's worth of water cooling stuff?

> > Most people do it to make their Machine quieter

> > Doug

> Precisely (and that is the primary reason I stated on the web page).
> It's possible to be completely fanless, and that would be a good
> thing, but I don't know if I have the ability to water cool a power
> supply.  The primary noise sources are the CPU fan and the GPU fan,
> and I really would like to put the sides back on the case, but I
> can't because of the heat.

> Soooooo, I figured I'd give water cooling a try.

John Simmon

And So It Begins...

by John Simmon » Thu, 24 Apr 2003 19:12:53

But, to a man, all of the recognized 'experts in PC watercooling  say
that a higher flow rate is more important that high pressure.  The
problem lies in the decrease in flow as the water travels through
inefficient routing of tubing forced by the size and available room
in your typicasl PC case.  

Every time your water path makes a turn or goes uphill at any point
in the system, it decreases flow.  The longer your water path, the
less flow you have. I've seen as much as 15 feet of tubing using a a
computer.  That's an amazing amount of tubing considering the small
spaces we're talking about.  However, it was probably the only way it
could have been done in that particular situation.

Further, the waterblocks and radiators are extremely small (compared
to an automotive system), so the water spends very little time in
there anyway.  Also, in an automotive system, the components actually
NEED to warm up to operate effeciently, so slowing the ware down or
reducing the size of a radiator is done to effect that requirement.
In a computer system heat *of any kind* decreases efficiency, and
needs to be evacuated at the best possible speed.


> Like anything with engines tho, if it flows too fast it doesnt have enough
> time to extract the heat off the cpu. Production racing they will often cut
> down water pumps on the car to slow the speed of the water because they were
> ment for slow driving with low revs around town..

> Cool Hand Luke
> -=87=-







> > > > What are your current system specs, and why is it running so hot that
> it
> > > > needs all that money's worth of water cooling stuff?

> > > Most people do it to make their Machine quieter

> > > Doug

> > Precisely (and that is the primary reason I stated on the web page).
> > It's possible to be completely fanless, and that would be a good
> > thing, but I don't know if I have the ability to water cool a power
> > supply.  The primary noise sources are the CPU fan and the GPU fan,
> > and I really would like to put the sides back on the case, but I
> > can't because of the heat.

> > Soooooo, I figured I'd give water cooling a try.

Goy Larse

And So It Begins...

by Goy Larse » Fri, 25 Apr 2003 03:47:33


> Like anything with engines tho, if it flows too fast it doesnt have enough
> time to extract the heat off the cpu. Production racing they will often cut
> down water pumps on the car to slow the speed of the water because they were
> ment for slow driving with low revs around town..

While you may be right about this, on my particular engines, the old
Opel CIH engines from pre 1985 (ish), the reason for slowing down the
water pump is two fold

1. it was designed to run at lower revs and when revving the engines to
7k and beyond, the pump becomes inefficient and doesn't circulate the
water properly, it starts to cavitate (?) and just whips the water to
foam (not the most technical description perhaps :-)

2. With the addition of oil coolers etc, the standard radiator is more
than capable of handling the extra heat build up from the tuned engine,
and slowing down the water pump will give you extra power

Beers and cheers
(uncle) Goy
"goyl at nettx dot no"

http://www.theuspits.com

"A man is only as old as the woman he feels........"
--Groucho Marx--

Ric Seyle

And So It Begins...

by Ric Seyle » Fri, 25 Apr 2003 04:42:35



>>Like anything with engines tho, if it flows too fast it doesnt have enough
>>time to extract the heat off the cpu. Production racing they will often cut
>>down water pumps on the car to slow the speed of the water because they were
>>ment for slow driving with low revs around town..

>While you may be right about this, on my particular engines, the old
>Opel CIH engines from pre 1985 (ish), the reason for slowing down the
>water pump is two fold

The engine has to develop more power than drag produced by the water
pump!   :-P

--
Ric Seyler
Online Racing: RicSeyler
GPL Handicap 6.35

http://www.pcola.gulf.net/~ricseyler
--------------------------------------
"Homer no function beer well without."
- H.J. Simpson

Roger Squire

And So It Begins...

by Roger Squire » Fri, 25 Apr 2003 10:37:48

enough time to extract the heat off the cpu

    This is false.  In this heatpump situation, the only purpose of the
water is to move heat from the cpu to the radiator, and slow-moving  water
has low turbulence and accepts less heat per time unit than fast-moving
turbulent water.

Issues with high-revving car water pumps have more to do with
cavitation-caused inefficiencies, and are unrelated to the basic point that
faster water is better than slow water.  Of course a super water pump also
adds heat itself to the water, but I'll ignore that effect.

rms

Roger Squire

And So It Begins...

by Roger Squire » Fri, 25 Apr 2003 10:41:37

    And here's another difference between car and computer waterpumps.  The amount of power the computer waterpump consumes is independent of the power used by the cpu, we assume a limitless supply of electrical energy.

rms


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