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Date: Thu, 04 Mar 2004 13:54:26 -0500
From: Finn Lassen <finnlassen@netzero.net>
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To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Subject: Re: [FlyRotary] Re: Ideal Cooling System Plumbing (was Re:[FlyRotary]Re:
  overflow connections
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Jim Sower wrote:

> <... Why wouldn't the pressure increase when water levels drop and 
> steam develops? ...>
> Need to work backwards on this one.  If the water level drops, one 
> would deduce that it happens for a reason, and a leak comes 
> immediately to mind.  When the cooling system starts leaking, the 
> pressure drops off substantially quite a while before any significant 
> drop water level.

I don't agree. A minor leak (pin hole) will not cause a significant 
pressure drop. Sure, loosing the cap or a hose the pressure will drop.

>   FIRST the pressure drops precipitously, and THEN the coolant level 
> starts to go down ... FINALLY the temps start to rise (provided the 
> temp sender is submerged in what water remains).
>
> If you were to use a coolant level indicator, where would you put it?
>
Yes, that is a tough one. Somewher in the upper part of the pump 
housing. The whole idea is to get an early warning - must be able to 
loose more coolant before pump stops pumping, so you can make it to the 
nearest airport without frying the engine.

>   Not in the block, because Ed has established that what coolant 
> remains is relatively well distributed in the block.  In the expansion 
> tank?  I would suspect you'd get a lot of "false negatives".  I don't 
> know where I'd put one, or how much to trust it.
>
> Just a theory .... Jim S.
>
Obviously is going to take some testing and trial and error.

Finn