maxjohansson(at)elisanet.
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 Posted: Tue Mar 29, 2011 11:13 am Post subject: Rrotax 912 air filter tubing connection problem (Andrew McMe |
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Andrew
Had exactly the same problem with the 63 mm diameter airbox inlet and the 61 mm diameter offset outlet on the K&N filter in my 701 with a 912ULS engine. Stay with the 63 mm duct tube and go visit the hardware store and look for a rubber or plastic tube end insert that will take car of the difference in the airfilter end. Take the airfilter with you to be able to test on site. Your duct tube is able to accomodate some mismatch, but the 63/61 mm difference is simply a little too much. Tighten a good jubilee clip over the doubled tube-end and you are ready to fly...
BR Max, in Helsinki opposite NZ
| 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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