[Healeys] Head Gasket

[Bob Spidell]

Which, of course, is the theory of the various 'water wetter' products. 
I tried (the original, I think) Water Wetter from Redline and didn't 
notice a significant reduction in coolant temp; but, I've got a bottle 
of the Dynolite version on the shelf I'll throw in the next time I 
change out coolant. As they say: "Hope springs eternal."


On 2/24/2022 8:30 AM, Michael Salter wrote:
> Interesting article Bob but IMHO their statement:
> "Pressure in a cooling system is vital for keeping water in contact 
> with the metal surfaces of the cylinder heads and block."
> is something of an over simplification.
> The reality is that any "boiling " of the coolant produces a "bubble" 
> of gaseous coolant, there is no air, as such, involved.
> Their statement :
> "Pressure keeps the air compressed and maintains the water-to-metal 
> contact. "
> suggests that the cooling system contains air; it shouldn't contain 
> any air, other perhaps the very small quantity disolved in the coolant.
> Pressurizing the cooling system raises the boiling point. Raising the 
> boiling point means that the temperature of the engine surfaces where 
> gaseous coolant will be generated will also  need to be higher for 
> boiling to occur.
> As the rate of heat radiation from the cooling surfaces is 
> proportional to the 4th power of the absolute temperature there is 
> also a considerable increase in the amount of energy that can be 
> dissipated by the radiator.
> These things together make pressuring the cooling system even to only 
> 7 p.s.i. very advantageous.
> As I mentioned earlier the problem with the 100 insofar as cooling 
> system pressure is concerned is the carbon seal in the water pump and 
> perhaps the design of the radiator tanks.
>
> M
>
>
>
> On Thu., Feb. 24, 2022, 10:42 a.m. Bob Spidell, <bspidell at comcast.net> 
> wrote:
>
>     I was about to jump in and say "But, but, but .... pressure only
>     raises
>     the boiling point but, for once, I did some 'research' first:'
>
>     "Pressure in a cooling system is vital for keeping water in
>     contact with
>     the metal surfaces of the cylinder heads and block."
>
>     https://www.motortrend.com/how-to/understanding-the-cooling-system-cool-under-pressure/
>
>
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