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.

    Lynn,
      I have heard that would be advantagous to connect the pressure cap to the input
 side of the water pump to reduce system pressure on the press. cap. What is your
 opinion?

    Kelly Troyer

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