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     1. 11:30 PM - 582 cooling circuit pressure valve (Renaud)
 
 
 

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Time: 
11:30:47 PM PST US
Subject: 
582 cooling circuit pressure valve
From: 
"Renaud" <rephie@libertysurf.fr>
      
      
      Maybe one of you have some experience about this: on my 582 (spak-plugs up, radiator
      at the bottom and expansion tank at the top), the excess pressure valve
      normaly integrated in the plug has been removed by the previous owner, apparently
      based on the recommendation of a "very experienced" guy (?!) As a result,
      the cooling circuit is never pressurized!?
      
      This worked fine for about 75 hours, but I just discovered that now when applying
      full power, the water temperature suddenly drops very significantly, below
      the 140 F limit. I don't remember this behavior when I started to use my plane
      last year.
      
       I checked the liquid and the circuit: very clean, no corrosion, no obstruction.
      I am suspecting the absence of pressure valve, but I still can't understand
      why the temperature suddenly drops when applying full power.
      
      Does one of you know the reason for pressurizing the cooling circuit: avoiding
      cavitation in the pump, increasing the boiling temperature of water, etc? Is there
      any risk of damaging the water pump when running unpressurized? 
      
      I forgot to mention that I have a cabin radiator in parrallel with the cooling
      radiator, but it is currently isolated with valve, so I don't think there is any
      impact.
      
      Thanks for your help
      
      --------
      Renaud
      
      KitFox IV - 1200. Rotax 582.
      
      
      Read this topic online here:
      
      http://forums.matronics.com/viewtopic.php?p=115723#115723
      
      








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