flyrotary@lancaironline.net Mailing List Archive

Doug, Wendell. et al,

Ed was right..........The auto installation "T's" the return from

the heater core to the bottom (cool side) of the radiator which is

plumbed to the inlet (low pressure side) of the waterpump........You

want to plumb the heater core to receive hot coolent from the stock

heater outlet on the rear housing........You do not want heater coolent

to be cooled in the radiator (defeats purpose of the heater)...........

Your coolent to oil heat exchanger on the other hand should

be plumbed to pick up coolent from the high pressure cool (after the

radiator) side of the waterpump housing before it enters the engine

block and return to the radiator with the hot coolent to the thermostat

side of the waterpump housing or directly to the radiator.........IMHO

I stand to be corrected if this is faulty reasoning.................

--
Kelly Troyer
"Dyke Delta"_13B ROTARY Engine
"RWS"_RD1C/EC2/EM2
"Mistral"_Backplate/Oil Manifold

-------------- Original message from "Wendell Voto" <jwvoto@itlnet.net>: --------------

Subject: [FlyRotary] Water Return in Radiator

I need to add some water returns to my cooling system and want to make sure this will work before drilling holes in my Griffin radiator. I need to return water from my heater core and Fluidyne heat exchanger to the suction side of the water pump. My plan is to drill a couple of holes in the end of my radiator and weld on a couple of AN / NPT fittings to attach the hoses to.

From what I have read and seen in the past, the heater core return on the car goes right up into the neck of the water pump housing. I am not a systems expert on this, but my simple brain sees no reason why I shouldn't be able to bring both these returns to the side where the hot engine water enters my radiator. This will will allow them to pass through the radiator for some cooling prior to entering the pump housing and cycling through the system again. Since Mazda didn't configure their system like this, it does leave me wondering i f it will work okay...

Thanks for any information...

Doug,

I took a look at the Mazda radiator to confirm my recollection of the car version to the heater return. It is Y connected to the radiator and it looks to me as if it is connected to the line that comes from the water pump. This would be a high pressure area except the way the Y is used, it causes the flow from the heater to pass thru the radiator for additional cooling before returning to the engine. I was thinking of returning mine back to the water pump directly, no additional radiator cool, but use a throttling valve to adjust flow of cut it off completely.

Wendell