,
> Modern engines are pressurized to 20 psi, or more,
That is after the t-stat at the cap. It's much higher on the engine side of
the t-stat. I know of a TR4 racer who has documented that his 15psi radiator
cap does not blow off, while he is registering well over 30 psi in the head.
The t-stat does act as a pressure inducing restrictor; it's basically an
orifice plate. The water between the pump and the t-stat are at a higher
pressure than the rest of the system.
Think about the cooling system. You have a pump(which increases the system
pressure and a T-stat, which has a much smaller opening than the rest of the
system, so it's really an orifice plate(providing a pressure drop on the
other side).
jib
Mechanical Enginerd, PE, yada, yada, yada
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