[Fot] TR4 expansion tank question

[tr4racing at googlemail.com]

Hi Randall,

I use the tank for 3 purposes:
- filling the system properly
- to keep more coolant 
- to vent the system automatically.

If the water pump might cavitate you get air in the system which will after a while force out water if not removed.
The venting hoses which are connected with the tank immediately removes any bubbles and send them to the tank where they don't do any harm.
Very important on endurance races with long straights.

Chris 
Gesendet mit BlackBerry von Vodafone

-----Original Message-----
From: "Randall" <tr3driver at ca.rr.com>
Sender: fot-bounces at autox.team.netDate: Thu, 7 Jun 2012 09:31:33 
Cc: 'FOT List'<fot at autox.team.net>
Subject: Re: [Fot] TR4 expansion tank question

> Expansion tank - tank that is under pressure and keeps extra coolant in
> store. Needs to be the highest spot of the system.
> 
> Overflow bottle - catches the forced out water. Needs to be lower than
> the filler cap.

I agree on the definition of expansion vs overflow (aka recovery).

But, while it is better/easier to have the expansion tank at the top; it can
still work mounted lower.  One example is the later (73 onwards) Triumph
Stag, which had an expansion tank mounted near the bottom of the radiator.
The downside of having it down there is that you cannot use its cap to fill
the system (the Stag has a separate filler cap without a pressure relief),
and you cannot tell if the system is leaking (or is full) by the level in
the expansion tank.

The Stag's expansion tank was attached to the radiator by a small tube
running to the top of the LH radiator tank, so any small amount of
accumulated air would tend to find its way into the bottle as the system
warmed up.

-- Randall 
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