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rotax 912 air filter tubing connection problem

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Andrew McMenamin

Joined: 28 Nov 2010
Posts: 3
Location: Rotorua, New Zealand

Posted: Mon Mar 28, 2011 12:46 am Post subject: rotax 912 air filter tubing connection problem

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

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psm(at)att.net
Guest

Posted: Mon Mar 28, 2011 2:19 am Post subject: 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:

 	  Quote: 	
		   



 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





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 http://forums.matronics.com/viewtopic.php?p=335236#335236

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