Hmmm.  We've previously discussed destruction/damage of radiators - - -  by
electroysis.  Now we are discussing something - system full (no air) or
system not quite full (air cushion), in which pressure rises rapidly to or
above "cap release pressure" with No Air, or remains low with Air Cushion.
    -  Maybe I've been blowing my radiators by filling VERY CAREFULLY to the
very top of my top mounted radiator cap neck on my 2 Ford Escorts!!!

David

----- Original Message -----
From: "Dale Rogers" <dale.r@cox.net>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Sunday, June 26, 2005 4:21 PM
Subject: [FlyRotary] Re: cooling system air cushion (was: Coolant Leak)


> Hi All,
>
>    I know John was cracking a funny, but - in all seriousness
> - don't we already _have_ a solution to this?
>
>    Maybe I'm overlooking something (and if I am, I'm *certain*
> that someone will happily correct me), but isn't the air
> cushion part of the job of the swirl pot / expansion tank?
> It traps any air in the system and holds it above the level
> of the engine block.  Then, when the pressure exceeds the
> cap rating it vents the air (and eventually, maybe some
> coolant).  In most systems I've seen, the venting goes into
> overflow bottle, such that - when the engine cools - first
> it sucks back in the water pushed overboard; then it replentishes
> the air cushion.
>
>    So, with a properly located swirl pot, one fills to about
> 1 - 2" below the cap, just as with an older (1950's) automobile radiator.
Right?
>
> Regards,
> Dale R.                              (___
> COZY MkIV-R13B #1254          |----==(___)==----|
> Ch's 4, 5, 9, 16 & 23 in progress   o/ | \o