|
|
----- Original Message -----
From: "Ed Anderson" <eanderson@carolina.rr.com>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Tuesday, March 09, 2004 11:14 AM
Subject: [FlyRotary] Re: air pocket in cooling system
----- 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
Thanks, Ed....I won't be able to do full-power run-ups as my propeller is
not yet installed, but I can limit it to around 4000 RPM's and see how that
works out. I am likely to follow Neil's suggestion and install a small 1/8"
NPT plug in the -16 AN elbow that comes out of the top of my water pump
(above the thermostat). As this is the highest point on the engine, it makes
sense that I could do the "final" filling from that hole, then just
re-install the plug.
I removed the thermostat, but now I'm thinking that if I am successful
in purging all of the air out of my system, it will all be for naught, as
when I re-install my thermostat, I will loose a lot of coolant, and have to
start all over with the purging. Oh well, no-one said this was going to be
easy. Thanks again, Ed for your experienced guidance. Paul Conner
>> Homepage: http://www.flyrotary.com/
>> Archive: http://lancaironline.net/lists/flyrotary/List.html
|
|