Another consideration is the ability/design of components such as the heater
core.
On the Sunbeam Tiger, a lot of heater cores are "pooched" out because the
design pressure limit has been exceeded by guys seeking boilover protection by
going to 15 psi caps.
The 4 psi cap works as designed, allowing the expansion tank built on to
function pre design.
The aneroid t stat is no doubt one of those components.
Just saying....
Sent from my Verizon Wireless Phone
----- Reply message -----
From: "Randall" <tr3driver at ca.rr.com>
To: <triumphs at autox.team.net>
Subject: [TR] 4lb TR3 Rad Cap
Date: Mon, Feb 27, 2012 12:41
> I have often wondered why the TR3 cooling system only has a 4lb
> pressure cap.
I believe that is because the original thermostat was an "aneroid" type,
where the pressure inside the bellows opposes the pressure outside the
bellows to determine the thermostat position. As the pressure outside the
thermostat rises, it takes a higher temperature to open the thermostat. At
any rate, my TR3 seems to do just fine with a 10 lb cap and a modern "wax
pellet" thermostat.
> I have never heard any definitive data on just where the line should be
The "definitive data" IMO is how much it will hold without losing through
the overflow, under all operating conditions. As you have seen, and others
reported, halfway is too much (even though I believe it is documented that
way on page 13 of Practical Hints 6th ed).
Of course it is possible you have some other issue, like perhaps a tiny
headgasket leak. BTDT But I think you'll find that, if you leave it alone,
the water level will go down a bit and no more.
-- Randall
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