Paul A. Franz, P.E.
Joined: 02 Dec 2008
Posts: 280
Location: Bellevue WA
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 Posted: Mon Dec 22, 2008 8:36 am Post subject: water overflow into expansion tank |
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On Mon, December 22, 2008 8:05 am, jridgway wrote:
| Quote: |
I was just wondering when the engine COOLs and draws the reserve water back up, it
must also first draw the air in the line back in the engine.
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As long as the tube enters the reservoir below the water line, all the air will be
purged after a couple of warm up - cool down cycles. The expansion of the coolant in
the engine is enough to purge the air in the vent line. Some of the air is entrained
in the hot fluid and that air comes out of solution in the overflow tank. That's why
it can take a couple of cycles of warm up and cool down to get all of the air out.
This is important to protect the coolant from oxidation. The oxidation of ethylene
glycol produces acidic products. These effects are buffered by the corrosion inhibitor
in the anti-freeze. If there is no air interface to the hot fluid, the life expectancy
of the anti-freeze will be longer. The oxidation is temperature dependent and doesn't
happen much in the expansion tank since that fluid is quite cool compared to the
temperatures within the engine.
--
Paul A. Franz
Registration/Aircraft - N14UW/Merlin GT
Engine/Prop - Rotax 914/NSI CAP
Bellevue WA
425.241.1618 Cell
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_________________
Paul A. Franz, P.E.
Registration/Aircraft - N14UW/Merlin GT
Engine/Prop - Rotax 914/NSI CAP
Bellevue WA
425.241.1618 Cell
425.440.9505 Office |
|
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