Hi Jeff,
I am using the optional Rotax airbox on my 912ULS. The inlets of the
airbox are designed for 60 millimeters diameter SCAT, one for cold air
and one for preheated air. I suppose Rotax have determined that this
diameter was necessary. On my installation, cold air is suplied by a
NACA on the left side of the cowl. You can see a picture of the cowl in
my album
http://www.europaowners.org/modules.php?set_albumName=album196&op=mod
load&name=gallery&file=index&include=view_album.php
I am very satisfied with this installation which allows straightforward
controllable carb heat. However there is one inconvenience worth to
mention: I consistently see induction air temperature (measured inside
the airbox) which is 6 degrees Celsius higher than OAT. This is due to
the length of SCAT ducting between the NACA intake, the filter box and
the aluminum airbox, all that stuff being heated by the hot air inside
the cowl. Those 6 degrees may reduce power by up to 2%. The Europa XS
airbox is better on this point of view, as it takes the air directly
---From above and induction temperature probably equals OAT.
Regards
Remi Guerner
F-PGKL
Europa-List: Induction Air
Hi All,
While I have Gold Rush in for the winter annual I'm considering some
cowl changes. Including closing off the upper NACA use for induction
air on the 912-S and using the lower starboard NACA normally used for
the 914 induction. I seem to remember someone else using that for carb
intake and under cowl carb heat. I'm going to use the same air plenum
with the same filter as now but I will fabricate a side intake to
attach to the top of the plenum and a 2 inch scat tube coming up from
the below NACA. My question is this. I already have the inlet plumed
for this 2 inch tube and not a lot of room to increase it to 3 inch. My
concerns is if the 2 inch would be enough for both carbs. Has anyone
else done this with the 912-S and if so what size of tube did you use?
Best Regards,
Jeff R.
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