---------------------------------------------------------- Europa-List Digest Archive --- Total Messages Posted Fri 08/16/24: 1 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 06:21 AM - Rotax 912ULS oil consumption (JonathanMilbank) ________________________________ Message 1 _____________________________________ Time: 06:21:20 AM PST US Subject: Europa-List: Rotax 912ULS oil consumption From: "JonathanMilbank" Does your 912ULS really use only 1/2 litre (500 ml), or 1/2 US quart of oil per 50 flying hours? Mine has done a total of 780 hours ( 560 since a rebuild at 220 hours, following a crash involving a previous owner ) and the oil consumption has steadily increased. Every 50 hours I replace the oil filter with the Rotax supplied type and the oil is the recommended Aeroshell SPORT Plus 4. The instantaneous compression test done recently gives about 3% difference, highest 177psi to lowest 172psi, and aircraft climb performance remains strong at each annual permit renewal flight test. I won't do the scary leak-down compression test again, having once nearly broken my hand when the propeller kicked. Researching on line tells me that the maximum acceptable consumption is 60 ml per flying hour, or 3 litres (3 US quarts) for 50 flying hours, while mine currently averages 40 ml / hour, or 2 litres / 50 hours. It grieves me when others tell that they hardly ever top up their oil tanks. Oil pressure in flight is just over 4 bar or 60 psi. Oil temperature in the cruise varies seasonally between 80 and 100 deg C ( 176 and 212 deg F ). Living this far north means that most of the year it's at the cooler end. The inside of the exhaust outlet tube is no more sooty than other people's engines with lower oil consumption. There's no "wet" oiliness evident in the exhaust, but a slight brown exhaust stain extends rearwards under the port wing and along the fuselage. Last year the four inlet valve stem seals were replaced, but that didn't help either. Also when I borrowed a "cheap" not very clear boroscope, I couldn't see signs of scratching on the cylinder walls. I'm starting to suspect that a few Rotax 912ULS owners may be deceiving themselves, although those I know locally definitely aren't. Read this topic online here: http://forums.matronics.com/viewtopic.php?p=513789#513789 ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message europa-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/Europa-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/europa-list Browse Digests http://www.matronics.com/digest/europa-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.