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- From: rakoczynskij@gtephx.UUCP (Jurek Rakoczynski)
- Newsgroups: rec.autos.tech
- Subject: Re: RMI-25 cooling system treatment
- Message-ID: <1992Aug18.211155.20647@gtephx.UUCP>
- Date: 18 Aug 92 21:11:55 GMT
- References: <12130045@hpmwga.sr.hp.com> <26439@life.ai.mit.edu> <1992Aug12.224443.17598@nuchat.sccsi.com>
- Organization: AG Communication Systems, Phoenix, Arizona
- Lines: 46
-
- In article <1992Aug12.224443.17598@nuchat.sccsi.com>, kevin@nuchat.sccsi.com (Kevin Brown) writes:
- > In article <26439@life.ai.mit.edu> pwu@pop-tarts.ai.mit.edu (Peng Wu) writes:
- > >An important function of antifreeze is, in my opinion, anti-boiling. If the
- > >cooling system treatment RMI-25 does not raise the boiling temperature of
- > >water much, I would hesitate to use it with plain water in a car designed to
- > >use antifreeze, regardless other promises.
- >
- > While the boiling point of the fluid is raised by the antifreeze, the
- > antifreeze will also reduce the heat transfer capacity of the fluid.
- >
- > The primary method of increasing the boiling point of the fluid is to put
- > it under pressure. This is why most automotive cooling systems run at 15
- > psi or so over atmospheric.
- >
- > Antifreeze is just that: something to keep the fluid from freezing. The
- > "coolant" term for it is really a misnomer. Antifreeze also has corrosion
- > inhibitors and lubricants which prevent the passages from corroding and
- > help lubricate the water pump.
- >
- > If you're having cooling problems, and want to increase the cooling capacity
- > of your cooling system, running straight water works much better than running
- > a water/antifreeze combination. But in doing so, you lose the other
- > properties provided by antifreeze.
- [sig deleted]
-
- Kevin, IMHO you've over simplified Antifreeze properties. Your right
- that antifreeze does reduce the heat capacity/volume of the cooling
- fluid but it also reduces the water surface tension to allow it to
- flow with less resistance throughout the system. I don't believe the
- slight increase in heat capacity of plain water would reduce the
- chance of localized boiling if an antifreeze mix with a higher boiling
- point is having a problem dealing with boiling.
-
- You could probably play with some of the polymer/silicone/? based
- chemicals on the market the reduce water surface tension, to increase
- flow rate within the cooling system. I recall that in London, UK,
- their public works is using it in some of the sewer systems that are
- at their peak flow capacity, to increase flow rate by 10%, to delay
- other more drastic measures. I've read of speculations where it was
- also used in tests by submaries, torpedoes, and some of the prominent
- sail boat races. ... for what that's worth ...
- --
- Jurek Rakoczynski, AG Communication Systems, POB 52179, Phoenix, AZ. 85072
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