---------------------------------------------------------- RotaxEngines-List Digest Archive --- Total Messages Posted Wed 05/30/07: 1 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 11:30 PM - 582 cooling circuit pressure valve (Renaud) ________________________________ Message 1 _____________________________________ Time: 11:30:47 PM PST US Subject: RotaxEngines-List: 582 cooling circuit pressure valve From: "Renaud" 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 ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message rotaxengines-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/RotaxEngines-List.htm Web Forum Interface To Lists http://forums.matronics.com Matronics List Wiki http://wiki.matronics.com Full Archive Search Engine http://www.matronics.com/search 7-Day List Browse http://www.matronics.com/browse/rotaxengines-list Browse Digests http://www.matronics.com/digest/rotaxengines-list Browse Other Lists http://www.matronics.com/browse Live Online Chat! http://www.matronics.com/chat Archive Downloading http://www.matronics.com/archives Photo Share http://www.matronics.com/photoshare Other Email Lists http://www.matronics.com/emaillists Contributions http://www.matronics.com/contribution ------------------------------------------------------------------------------------- These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.