[Fot] TR4 Coolant System Expansion/Recovery

[Tony Drews]

I would suggest NOT running any lines from the block / head to a tank 
with a normal radiator cap.  The block pressure is well above the 
radiator pressure - the thermostat housing is the orifice that keeps 
the block pressure high.  Jack installed a radiator cap at the top of 
the thermostat housing and kept losing all of his coolant through the 
radiator cap's bypass until we figured this out and plugged the 
bypass vent.  So the rad cap in the thermostat housing was just a 
means of filling the engine and was completely sealed once 
filled.  We still used the radiator's cap for venting down to a 
reasonable pressure.

If you use an expansion tank and tie it to the heater port in the 
head, 30+ psi water from the head will pressurize the tank.  With the 
pressure controlled as you describe I predict that you will loose 
coolant due to this overpressurization.

- Tony Drews

At 11:10 PM 12/31/2009, Peter Vucinic wrote:
>Lister's,
>
>
>
>I believe that we have already seen a few threads on this subject. But I am
>seeking general consensus on the plumbing/routing of coolant lines to and
>from a coolant system recovery/expansion tank/bottle for the TR4.
>
>
>
>Obviously I am making the following assumptions: -
>
>1.    Expansion/recovery tank will be mounted higher than the cylinder head.
>Say, on the firewall next to the battery
>
>2.    Existing Radiator cap to be of the fixed/closed type
>
>3.    Coolant system over pressure will now be controlled by radiator cap
>fitted to expansion/recovery tank
>
>4.    Coolant total loss will now occur at the expansion tank due to over
>pressure
>
>
>
>My questions are: -
>
>1.    Are any of you already running a system such as the above? Successful
>in controlling air into the coolant circuit/system?
>
>2.    Where is the most appropriate connection to the coolant expansion
>recovery tank made? E.g. At the heater tap port and the back of the water
>pump? Thermostat housing? Radiator top hose/port?
>
>3.    Do you have an air bleed orifice/port in this cooling circuit/system
>as well?
>
>
>
>
>
>Thanks in advance
>
>
>
>
>
>Kind Regards
>
>Peter Vucinic
>
>TR-4
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