Randall, The statement was made as if it was factual as it relates to the
TRactor engines and I wanted to know the origin of the facts. While it may
be self evident and the argument that it is appears strong, is there factual
evidence somewhere that the by pass and sleeved thermostat were designed for
the "facts" stated?
JVV
----- Original Message -----
From: "Randall" <tr3driver@ca.rr.com>
To: "'Triumph list'" <triumphs@autox.team.net>
Sent: Wednesday, January 10, 2007 8:12 PM
Subject: RE: [TR] TR2,3,4 thermostats
> > Is this opinion or fact? If factual where does one find that
> > reference? I'd
> > like to know the origin of this statement.
>
> Seems self-evident to me. Without the bypass, the water doesn't circulate
> at all when the thermostat is fully closed. With no circulation, you're
> going to get hot spots. The hottest spots will be in the head near the
> exhaust valves. Since water is actually a pretty lousy conductor of heat,
> the water next to the valves can easily reach boiling before the water
next
> to the thermostat gets hot enough for the thermostat to open. When that
> water boils, it will be lifted away from the head surface, removing the
heat
> sink and allowing the metal to get _very_ hot (remember there are gases on
> the other side of that thin wall of cast iron that may be over 1000F).
When
> the water does start to circulate, the area will be bathed in relatively
> cool water from inside the block (and the radiator, which is still room
> temperature at this point).
>
> Hot cast iron + cold water = cracks. Maybe not every time, but it's a
> definite chance.
>
> Randall
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