[xj-s] Re: Rad filtration.

["Kirbert" <palmk@mailer.gadcomm.net>]

> From:          <John_Warr-1@sbphrd.com>
> What I suspect is happening is that material in solution tends to de
> deposited in the relative cool of the radiator.

That would make sense, except that -- judging from other things, 
notably the standard residential water heater -- materials in 
solution tend to deposit on the HOTTEST surfaces in the circuit.  In 
fact, I wouldn't be too surprise to find that materials coalesce on 
the liners and heads, and then flake off and the flakes are what 
plug the radiator.

> I don't think you suddenly get big
> lumps coming along and gratuitously blocking the rad.

Depends on the lump.  The radiator man said I had lots of silicone 
sealant in there, and that's definitely a lump -- squeezed out of a 
joint during assembly, hardened into a lump, then peeled off and sent 
downstream.  OTOH, there was also rust particles, which I suspect are 
small and accumulate in piles in the bottom of the rad.

> Now, that might be interesting. I had not realised that you were suggesting
> using this as a clean up rather than a permanent installation.

The whole idea had started as a clean up, but it seemed to me that 
once clean up was accomplished the screens might as well be left in 
place.

> You could
> probably use an in-line hepa filter in that case...

HEPA?  That's REALLY fine, isn't it?  Why would I need anything that 
fine?

> but I think that the krud
> is generated over time, rather than a left over from machining.

Well, I've been thinking of left over from rebuild.  But the 
possibility of generation over time may need some discussion: just 
what would generate crud over time, and what can be done to prevent 
it?

> There are
> silicates formed from the alloy, Al salts appearing in solution...

Aren't these supposedly dealt with by the coolant?

> VERY hot
> water, which will often dissolve things that water should not dissolve at
> all....

If we could figure out what those things are, we could deal with 
them!

> It is a complex and hostile environment, and I think that the safest way is
> to keep it dead clean by regular flushing.

Which brings up another theory of mine.  We've been told for decades 
to change coolant every year, but only recently have I heard the 
suggestion to use distilled water.  If people regularly flushed and 
refilled their system with tap water, that would strike me as the 
MOST likely source of crud for plugging a radiator!  Of course, 
hopefully most folks have better tap water than I have.

Even so, when changing coolant I can see filling with distilled 
water, but I ain't gonna be flushing with distilled water.  Another 
thing that might be really helpful in this regard is a method to get 
ALL of the coolant, flushing water, etc., OUT of the system before 
beginning to fill it.  Offhand, the first step that comes to mind 
would be to jack up the BACK end of the car, to help the block drain 
towards the radiator.  Perhaps some way to connect compressed air to 
blow it out would be helpful?

 -- Kirbert      |     If anything is to be accomplished,
                 |     some rules must be broken.
                 |          - Palm's Postulate

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