Mailing List flyrotary@lancaironline.net Message #41299
From: Ed Anderson <eanderson@carolina.rr.com>
Subject: Re: [FlyRotary] Re: Water Return in Radiator
Date: Sun, 27 Jan 2008 09:56:00 -0500
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Wendell, while the heater return does return to the radiator hose, it is not the hose connected to the output side of the pump (thermostat housing) , but instead the heater return is routed to  the hose from the radiator to the inlet side of the pump.  At least it is in the both the 1986 and 1991 shop manuals I have.  This is a low pressure area whereas the hose from outlet of waterpump (thermostat housing) to the radiator is in a higher pressure area.
 
Ed
 
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.
Subscribe (FEED) Subscribe (DIGEST) Subscribe (INDEX) Unsubscribe Mail to Listmaster