---------------------------------------------------------- Zenith601-List Digest Archive --- Total Messages Posted Mon 03/28/11: 3 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 02:09 AM - rotax 912 air filter tubing connection problem (Andrew McMenamin) 2. 03:20 AM - Re: rotax 912 air filter tubing connection problem (Paul Mulwitz) 3. 05:24 AM - Chat Tonight (George Race) ________________________________ Message 1 _____________________________________ Time: 02:09:07 AM PST US Subject: Zenith601-List: rotax 912 air filter tubing connection problem From: "Andrew McMenamin" Hi List We have recently purchased a Zenith XL 601 with Rotax 912 ULS. The air filter is a standard Rotax circular filter PN 825 711 with an off-centre mounting for the tube from the air box. The filter is mounted on the lower cowling and connected to the air box by a tube. The problem is with the tube to air filter connection. The tube has the correct internal diameter to fit the standard Rotax air box but the other end is too big to fit the external diameter of the air filter mounting. The tube is made of some form of rubberized material with a series of circumferential rings keeping the section circular. Where it meets the air filter connection the circular rings are too large and the tube has a portion which has had the rings removed, and this is clamped onto the air filter opening with a large "Jubilee" worm drive hose clamp. This clamp distorts the circular air filter opening as it tightens, resulting in the tube and the clamp potentially slipping off. This does not seem a good design to me. I would have expected an adapter of some form to fit into the air filter opening and adapt to the internal diameter of the large tube. Has anyone found the same problem and a solution? I am posting this on the Rotax list and the Zenith XL 601 list. Thanks Andrew Read this topic online here: http://forums.matronics.com/viewtopic.php?p=335236#335236 ________________________________ Message 2 _____________________________________ Time: 03:20:03 AM PST US From: Paul Mulwitz Subject: Re: Zenith601-List: rotax 912 air filter tubing connection problem Hi Andrew, I've been flying a Tecnam Echo Super with Rotax 912-ULS for the last two years. It has no air box and no provision for carburetor heat. This seems to work just fine. Since the carburetors are mounted on the top of the engine I think they stay quite warm and carb heat just isn't needed. Perhaps you can consider modifying your setup to bypass the whole air box and use the normal filter mounting method. Paul Camas, WA On 3/28/2011 1:46 AM, Andrew McMenamin wrote: > --> Zenith601-List message posted by: "Andrew McMenamin" > > Hi List > We have recently purchased a Zenith XL 601 with Rotax 912 ULS. The air filter is a standard Rotax circular filter PN 825 711 with an off-centre mounting for the tube from the air box. The filter is mounted on the lower cowling and connected to the air box by a tube. The problem is with the tube to air filter connection. The tube has the correct internal diameter to fit the standard Rotax air box but the other end is too big to fit the external diameter of the air filter mounting. The tube is made of some form of rubberized material with a series of circumferential rings keeping the section circular. Where it meets the air filter connection the circular rings are too large and the tube has a portion which has had the rings removed, and this is clamped onto the air filter opening with a large "Jubilee" worm drive hose clamp. This clamp distorts the circular air filter opening as it tightens, resulting in the tube and the clamp potentially slipping off. > This does not seem a good design to me. I would have expected an adapter of some form to fit into the air filter opening and adapt to the internal diameter of the large tube. > Has anyone found the same problem and a solution? > I am posting this on the Rotax list and the Zenith XL 601 list. > Thanks > Andrew > > > Read this topic online here: > > http://forums.matronics.com/viewtopic.php?p=335236#335236 > > ________________________________ Message 3 _____________________________________ Time: 05:24:15 AM PST US From: "George Race" Subject: Zenith601-List: Chat Tonight Live Chat Room every Monday evening around 8:00 EDT http://www.mykitairplane.com Click on the Chat Room link at the top of the page. 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