Jerry Hey wrote:

Looking at Lynn's drawing of his cooling system, there are two radiator
caps, one on the swirl pot and one on the catch can.  This leads me to
wonder what kind of pressure the catch can will see. On my Nissan and RX-7
the catch cans are vented to the atmosphere.  Clearly I am missing
something. Jerry

The swirl pot has a filler cap that seals the pot but does not interfere with air or water moving to or from the make up tank. Only the make up tank (stock Mazda) has a pressure cap. The overflow from the make up tank in my case must end up in a container of at least one quart volume in order to keep fluids off of the racing surface. In an aircraft, just a hose out of the cowling
would do. Exit the hose in front of the pilot and you will be the first to know of a problem.

The make up bottle is kept 1/3 full of coolant. After several runs to temp. the bottle will need more coolant as the bubbles are removed from the system and are replaced by coolant from the bottle. This is not new thinking. It came stock on my 73 RX-2.

Lynn E. Hanover.

 
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