----- Original Message -----
From: "sqpilot@earthlink" <sqpilot@earthlink.net>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Monday, March 08, 2004 10:07 PM
Subject: [FlyRotary] air pocket in cooling system


> Hi, fellow rotary enthusiasts.  I decided to temporarily take the
thermostat
> out of my 13b for initial run-ups, testing and ECU programming.  When I
> removed the thermostat, there was coolant right up to the bottom edge of
the
> thermostat. However, you could look up and see the water temp sensor, and
it
> was in an air pocket.

>      I've been following the many posts that are currently being sent
> discussing cooling issues.  I have installed the "closed" system, with a
> pressurized expansion tank with the radiator cap on the aluminum expansion
>  about something like 60 seconds or more like 5 minutes ?  I
> installed a "real" throttle cable and throttle assembly today. No more
coat
> hanger run-ups.  Thanks so much for everyones assistance here.  Paul
Conner,
> 13b powered SQ2000 canard
>
>
Paul, I would recommend no more than a 60 second full power run up to burp
the engine.  I find it takes me about 3 such run ups to purge 95% of the
air.  Also, if you radiator is oriented somewhat vertically, you can
generally place your hand on the radiator side tanks and tell where the air
and coolant line is.  The tank will be noticeably hotter below that line and
cooler above it.  You can monitor your purging process after each run by
again determining where that line is and it should keep rising higher as the
coolant replaces the air pocket.    That's for my system of course and
anyone with radiator cores that may trap air.

Ed Anderson