Hey Paul, What if anything are people doing with the pipe that comes off
   of the engine to the interior heater core. Are we to plug that and if so
   what is a good way to do it? This probably wouldn't be a good place to
   run coolant to a surge tank or would it? It's location is pretty high on
   the engine and then it could be circulated back to the rad. Am I
   thinking the wrong way or what?

   BTW, I have my engine sitting in the mounts on the aircraft. Working on
   ignition, exhaust and cooling. I hope to be "making smoke" in the next
   couple of months.

   Thanks,
   Rick in Alaska

   That is essential as a breather tube to the top of the
   pressure tank. That is the only way to get trapped air and steam
   out of the engine in a nose high attitude.

   Paul Lamar

   Rick
   Are you meaning the approx 5/8 inch line out of the left rear of the
   engine that would go to the heater core.
   I'm wondering if Paul is thinking you mean the small outlet on the
   top back of the engine!
   This originally went to the throttle body from memory and is
   important I understand in getting trapped gasses out of the block.

   I've just blocked the heater outlet with a rubber plug at present
   for initial starts but was wondering the same thing.
   I think others have pulled the tube from the block and
   tapped and plugged the hole.

   Steve Izett
   Perth West Oz Renesis Glasair SII RG

   I'll see you in a couple of weeks Steve. I'll bring my camera :)

   Paul Lamar


Rick,

I am running a 3-rotor in a Lancair.  I used the 5/8' outlet for hot
water for cabin heat, same as in the cars.  That makes sense as that is
the hottest water in the system.  I capped the small outlet on the top
of the rear housing since my engine sits level when on the ground any
air just passes on through and out the engine.  If you're building a
tail dragger, then that is a good place to connect to the purge tank.  I
have an air purge line at the top of the return radiator tank.  This
line is connected to the purge tank (above water level).  From the purge
tank, below the water level, is a line leading to the water pump inlet.
Air gets trapped in the purge tank.  This system has been working for
100+ hours.

Be very careful you don't get an air pocket in the water pump cavity or
you're likely to fry your new engine on first start.  My system has a
port on the side of the WP housing that I must open and burp the water
pump whenever I've drained the coolant.  You can get around this by
drilling a weep hole in the WP housing which will let the air escape.

Mark S.


The Rotary Engine NewsLetter. Powered by Linux.
ACRE NL web site. http://www.rotaryeng.net
Youtube key word UTUBPLEASE
Copyright 1998-2008 All world wide rights reserved.