[Healeys] question for the fluid dynamics guys

[Harlan Polk]

David,
The coefficient of thermal expansion for water is 0.00012 volume increase
for one degree Fahrenheit increase. Ethylene Glycol's coefficient is
0.00032, nearly three time as much. So yes, the water/glycol mix is
expanding more than the car was designed for. Assuming a modern 50/50 mix
the thermal expansion would be 0.00022/0F. Each quart is 57.75 cubic inches.
So a 50/50,  7 quart system experiencing a temp rise of 130 degrees F would
increase its volume by (0.00022 x 130) x (7 x 57.75) = 0.0286 x 404.25 cu in
= 11.56 cubic inches expansion. If that expansion volume exceeds the (likely
water only) expansion volume designed before reaching the overflow, you have
your answer. Perhaps an overflow catch bottle with syphon return is the
answer.

-----Original Message-----
From: healeys-bounces at autox.team.net [mailto:healeys-bounces at autox.team.net]
On Behalf Of David Porter
Sent: Tuesday, April 22, 2014 7:35 AM
To: healeys at autox.team.net
Subject: [Healeys] question for the fluid dynamics guys

so, Have an old (1955) Talbot Lago in. Straight 6 twin cam, much like a Jag
or Aston. The radiator has a totally sealed screw on cap. About 1/2"
below the filler neck is an internal overflow tube of about 3/4''
diameter which tapers down rapidly to 1/4'' as it exits the top tank through
a soldered joint about 2 inches below the entrance of the tube.
  The car does not overheat but will always leave a puddle after shut down
(heat soak). now, even if the coolant level is below the coils it still does
this. Is this a case of steam condensation in the overflow tube or is it
possible that there is so much expansion as to raise the coolant level
several inches? This has me perplexed.. Dave
--
Dave Porter Porter Custom Bicycles 2909 Arno St. NE Albuquerque, NM
87107 505-352-1378 Go HERE: my world www.porterbikes.com/
$12.75
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