Re: [Healeys] Aluminum Radiator

[Bob Spidell <bspidell@comcast.net>]

It doesn't boil, just goes to 212 then gradually cools.  Yes, with a 7psi cap 
boiling would be a few degrees higher 
(forget the exact formula).  Also, doesn't always go to 212, only when it's a 
warm day and the engine is running nominal 
temp (180) or better.

This seems intuitively correct, but I can't explain it.  It seems the 'latent 
heat' will increase the temps, but only to 
a point (no additional heat is added since combustion has ceased).  Any 
thermodynamicists out there who can explain this?

Bob



On 10/16/2014 5:45 AM, warthodson@aol.com wrote:
> I would expect the coolant boiling point to be above 212 F due to the 
> increased pressure from the radiator cap & also 
> the coolant being a mix of water & anti freeze.
> This seems to indicate that your gage is inaccurate or the coolant is not 
> actually boiling, but then you would not 
> expect it to rise to exactly 212 every time.
> Gary Hodson
>
>
> Also, on a warm day when I shut down the temp will go to exactly 212degF
> (100degC), which gives me more confidence the
> gauge is correct (what my dad calls 'latent heat' causes the coolant to go the
> boiling point).
>
> Bob
>
>
>


-- 
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Bob Spidell           San Jose, CA            bspidell@comcast.net

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