[TR] Read the graph at 50/50 mix

[spook01@comcast.net]

Dave,
You're picking nits.  
The coolant mixture boiling point is still controlled by the water.  The difference between the boiling point of water alone, and 50/50 mix is what, 12-17 degrees?
The cap adds points to boiling temp by adding pressure, which stresses the systems' components.
"It was good enough for grand sire, it's good enough for me".  
I've since found information that the new waterless coolants have heat transfer rates at or near that of water.
The main thing, for me, is the ability to run a zero pressure cooling system. It means components last longer.  In fact, large trucks running the stuff use it for the life of the engine and components seldom break.
I got a note back from a chemical engineer .. sorry I can't attach it, but in essence, a 50/50 mix is not ideal as far as combined vapor pressures.  Water is the most volatile of the mixture, and rather then composing a straight line mix in the vapor, water grossly predominates in the evaporate.  When pressure in the system is released due to pump cavitation in the closed system or suddenly, when you remove the cap, the more volatile component - water - flashes into evaporate and takes the glycol with it.


Sent from my Verizon Wireless Phone

----- Reply message -----
From: "Dave" <dave1massey at cs.com>
To: <spook01 at comcast.net>, <triumphs at autox.team.net>
Subject: [TR] Read the graph at 50/50 mix
Date: Mon, Mar 3, 2014 10:44 am


That is still different than the original statement.

"When coolant is mixed 50/50 with water, the water stills boils at 212f at
sea level."

The effect at 50/50 may be less pronounced but it is still there and significant.  BTW, antifreeze was formulated to lower the freezing point, the pressurized system is implemented to raise the boiling point.

Dave



-----Original Message-----
From: spook01 <spook01 at comcast.net>
To: triumphs <triumphs at autox.team.net>
Sent: Mon, Mar 3, 2014 8:17 am
Subject: [TR] Read the graph at 50/50 mix


Note how slightly higher 50/50 boils.  The water component is the limited.  Note
boiling point as you reach 100% glycol.
Note comments on cap pressure.
Hope link below isn't stripped.

http://hellafunctional.com/?p=629

Sent from my Verizon Wireless Phone

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