Jerry Hey wrote:
 >
 > Some time back a cooling set up was discussed that had a pressurized
 > overflow tank. I can't remember the specifics.  Was a swirl pot at the
 > high point in the system still used?  How big is the overflow tank  and
 > how is it plumbed? Is this the recommended set  up?    Sorry to ask for
 > a repeat.  I thought I saved the relevant posts but I did not.   Jerry

   My swirl pot is an expended propane bottle. I stole the design from a
commercial item called a Rolairtrol. This used to remove air from water
heating systems on heat transfer packages I built at one time.
   Water with air entrained is plumbed into the pot at mid height on the
horizontal and at a tangent, so as to "swirl" the water. Entrained air pops
to the top of the pot and is plumbed off to the bottom of a pressure recovery
bottle. (stock RX-2 RX-3). The airless coolant leaves from the bottom of the
pot.
   The swirl pot will work when installed anywhere in the loop. It is more
efficient in the pressure side between the engine out and the radiator in.
The propane bottle is about one quart. The RX-2 recovery bottle is kept 1/3
full of coolant. When air from the swirl pot enters the bottom of the
recovery bottle, it pops to the surface of the coolant.
    When system pressure drops below the cap setpoint, as in reduced power
settings or shutdown, the compressed air in the recovery bottle drives only
coolant back into the swirl pot. After a few heat cycles, only coolant is
left in the system. The pressure recovery bottle will have to be replenished
several times as the air is exchanged for coolant.
   We started working on the car again this weekend, and I tripped the lever
on the 16 pound Stant lever cap. It was still holding pressure from the
runoffs last September.
The swirl pot idea I stole from Rolairtrol. The recovery bottle idea I stole
from Mazda.
Lynn E. Hanover

 
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