Subject: heater outlet and oil hose size
From: rotaryeng
Date: 7/20/2012, 8:08 PM
To: AAAA Put this in the To box 



 Where do I connect the small 1" hose outlet used for the heater in
    the car?  What type of hose should I use for the oil lines?
  Thanks   for any help Joe Berki

     The nipple for the heater is on the top of the rear(car) end housing.

     AN8 or AN10.

     Paul Lamar

    Paul,
    Does this heater hose connection get blocked off or does it get
    plumbed into the system?

    Joe Berki

    Block it off if you don't have a heater on a pusher. On a tail
    dragger vent it back to the water pump. Here is a jpg from my
 book.   How to Cool your Wankel.

    Paul Lamar

    1"?? Most auto heaters have 5/8" hose from the thermostat housing
 (engine  side) to the heater and 3/4" return to the water pump
 suction. Some use both as 5/8". That looks like a de aeration vent
 to the surge tank.

   Dale Davies

   Helps to fill the block as the engine is tilted up in a tail
  dragger. You get a big air bubble in there.

   Paul Lamar

  Paul,

  We ought to differentiate between the small 1/4" port on the top of
 the rear side housing and the larger 5/8" (?) port just below the
 oil filter pad.  We typically use the 1/4" port for an air bleed
 back to the swirl tank, and the 5/8" port for a cabin heater, if
 used, otherwise just block it off.  I wouldn't want to route it back
 to the water pump as this is heated water.  If anything, I would
 route it to the inlet side of the radiator.

  BTW, it isn't easy blocking the 5/8" port off as it is an oddball
  size, and there isn't enough material to drill it out to the next
  larger size.  I ended up cleaning it thoroughly and then filling the
  nipple with Devcon.

  Mark S.

  You are absolutely right.
  However the output part of the water pump is the inlet side of the
  rad :)

  Paul Lamar

  Correct me if I am wrong but does the water pump suction come from
 the cool part of the radiator and the pump out pressurize the block?

 Dale Davies

 Yes.
 It is more like the pressure is constant in the entire system.
 There may be a small pressure drop across the pump but we use a 30
 psi pressure cap to raise the boiling point.

 What is rather confusing about the 13B Mazda water pump is both
 inlet and outlet of the block water jacket goes through the pump body.

 The pump is built into the front cover on the RX8.

 Paul Lamar

 Being a Journeyman mechanic I realize the cooling system is pressurized by
the expansion of the coolant as it warms up. Once at operating temperature and
stabilized, there is no more pressure increase. The coolant pump is the
circulation "generator".

Dale Davies



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