Classic Mustangs List Archive

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Mail From: gregm (Greg McArthur)

Boiling point of water at 1 atmosphere in centigrade, Fahrenheit, and
Kelvin.



From: classic-mustangs-bounces at lists.twistedpair.ca
[mailto:classic-mustangs-bounces at lists.twistedpair.ca] On Behalf Of Lance
Robaldo
Sent: Thursday, August 27, 2009 3:57 AM
To: gregm at xmission.com
Subject: Re: [CM] Coolant loss



Right, that check valve HAS to be there.



Otherwise the radiator would belch out when we drove it, then when it
cooled, a vacuum condition would exist.



That would LOWER the boiling point of water which would make it boil over
even easier next time we drove the car..which would in turn create an even
stronger vacuum when it cooled.

The process would continue to worsen each time we drove the car.



That valve "originally" allows AIR to re-enter the radiator when it cooled,
thus relieving the vacuum.

So next time we drive, as the water heats up and starts to expand, a
PRESSURE condition will develop. Pressure RAISES the boiling point of water
and thus makes it harder to boil out. This in turn allows the water to pull
more heat from your engine.



And that class, will be our physics lesson of the day. Do your homework on
pg 100 and 212 and also do the problems in section 373.15.

(bonus points to anyone who can tell me the significance of those pages)



Lance Robaldo

Lance at Robaldo.com



From: classic-mustangs-bounces at lists.twistedpair.ca
[mailto:classic-mustangs-bounces at lists.twistedpair.ca] On Behalf Of Greg
McArthur
Sent: Wednesday, August 26, 2009 11:37 PM
To: Lance at robaldo.com
Subject: Re: [CM] Coolant loss



I stand corrected. Upon close inspection, there is a check valve in the
center of the radiator cap and a seal above and below the overflow.



When I bought the overflow tank for "thing2" (another '65 convertible but
"restomod", but I digress) the literature indicated that it would not
function as a coolant reservoir without modifications similar to those I had
previously described.



Greg







From: classic-mustangs-bounces at lists.twistedpair.ca
[mailto:classic-mustangs-bounces at lists.twistedpair.ca] On Behalf Of Z. Ray
Sent: Sunday, August 23, 2009 8:27 AM
To: gregm at xmission.com
Subject: Re: [CM] Coolant loss



This is just NOT TRUE. Every night the coolant in my '66 is sucked back
into the engine, & without any modifications needed to the radiator ! All
you have to do is made sure your radiator cap has the second seal that
contacts the top of the radiator cap. Coolant from out when the pressure
exceeds the rating of the cap, & flows back in as the engine cools and the
pressure is reduced and becomes a vacuum.



Z. Ray

'66 GT-350



On Aug 22, 2009, at 11:37 PM, Greg McArthur" <gregm at xmission.com> wrote:



For the overflow tank to work as a coolant reservoir the top of the radiator

needs to be modified. The overflow on a standard radiator is above the

pressure seal on the cap and acts as a check valve. Coolant can flow into

the overflow tank but can't get back into the radiator. For the overflow

tank to work as a reservoir there needs to be a line with a check valve into

the radiator below the pressure seal on the radiator cap.



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