I need to design a swirl pot for my renesis/rv6a installation. is there an accepted volume I need to work with? it's my understanding that the water pump outlet goes thru the swirl pot and then on to the radiator input, and that the pot should be close to the pump. would it make sense to look into the pot welded to the pump, if possible? are pots always cylindrical? kevin
Here is the system I have used on my race cars since 1975. I then found it on Mazda RX-2s and 3s.
My make up tank is actually off of an RX-2.
The swirl pot is a replica of a device used in commercial heating systems using hot water to heat big buildings, called a Rolairtrol by Bell and Gossett. Used to remove air from the hot water circuits.
Mine are made from expended propane bottles. Smal aluminum fire extinguishers work as well.
It is very difficult to remove the air from the rotary engine, and I have the engines out of the car every two or three weekends, so it turned into a giant pain with each refilling of the coolant system. The inlet flow is in the center and on a tangent so as to spin the coolant. Any air pops to the top of the can and as pressure goes up with temperature the air is forced into the bottom of the make up tank. When coolant temps drop a bit the pressure in the make up tank can force only coolant back into the system, no air. After only one heat cycle you will need to add coolant to the make up tank. The overflow tank is required for racing, but never gets any coolant in it.
This is not my idea. (The make up tank) It was on every Mazda imported to the US.
The cap on the swirl pot is a seal only used to fill the system. The pressure requlating cap is on the top of the make up tank. The swirl pot could have only a fitting for the line to the make up tank.
The system can be filled by removing one hose from the pot.
The make up pot need not be higher than anything else. Mine is on the passenger side floor. Use small diameter hose in the run to the make up tank. Light, cheap, works every time.
Lynn E. Hanover
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