On 3/4/04 11:15 AM, "David Carter" <dcarter@datarecall.net> wrote:

> Mark,  I'll embed comments in your e-mail below - and add some words about
> "best coolant leak indicator", triggered by Finn's e-mail earlier this
> morning and comments by Ed recently.
>
> David
>
> ----- Original Message -----
> From: "Marvin Kaye" <marv@lancaironline.net>  [ for Mark S. ]
> To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
> Sent: Thursday, March 04, 2004 8:23 AM
> Subject: [FlyRotary] Re: Ideal Cooling System Plumbing (was Re: [FlyRotary]
> Re: overflow connections
>
>
>> Posted for Mark Steitle <msteitle@mail.utexas.edu>:
>>
>> David,
>> I guess it comes down to how soon the system will go into melt down.  I
> see
>> it like a water cooler... why do they put the spigot on the bottom instead
> of
>> the top.  You'll get more water out of the cooler if you draw off the
> bottom.
>>   So,
>> in your cooling system, by drawing off the top of the radiator,
>
> The system I propose draws COOLANT off of the BOTTOM.  The AIR goes out the
> top, at least when you are filling the system on the ground with no flow.
> The main purpose is to be able to FILL the system and PURGE ALL AIR - right
> If we are talking about a slower leak (not a hose blowing or coming off,
> i.e., NOT and INSTANT LOSS of all coolant), then if the coolant level is
> simply steadily decreasing in the engine block, then, with both my a/c cores
> below the engine, the cores will be the last to empty and the pump is
> pulling out of the BOTTOM of the cores.
>   - The engine seals will already be toasted by the time the pump sucks
> the last coolant out of the radiators.

David, the water pump in the car is not a positive displacement pump. The
moment the impeller is exposed to air it will stop sucking. You are assuming
that the pump will suck all the liquid gradually from the radiator until
dry.
This can happen if the radiator was on top of the engine, or the pump was
the self priming type, which is not the case.
Regards;
Bulent