on my turbo 912 I use a giant zip tie round the engine mount and the airbox
with a piece of 1/2 inch hose in between(x 2 - one at each end of the
airbox.)
William Daniell
LONGPORT
+1 786 878 0246
On Sat, Apr 6, 2024 at 2:10=AFPM Bud Yerly <budyerly@msn.com> wrote:
> Some miscellaneous ramblings on the airbox.
>
> As stated, your engine airbox depends on the year group.
>
> My 1998 timeframe engine also has no brace. The only time a brace is nic
e
> on the non braced airbox mod (done sometime around 2010), is when using a
> thin silicone turbo discharge hose connected to the airbox. (The heavy
> double or triple braided black hose supplied by Rotax on the old engines
> was quite stiff and combined with the carb sockets at the manifold and ho
se
> clamps kept the airbox on securely (nearly all the time with balanced
> carbs.) The issue with the airbox in the old days was it kept sliding of
f
> the port carb due to oil accumulation. If you flew often, the oil thrown
> out of the turbo was but a wisp and if the engine was well tuned it staye
d
> put. If you didn't fly often and the 2-inch hose became oil soaked, then
> the plenum hose to carb would slide off (especially at full boost) and if
> the carbs were not well synchronized (read as "shaky engine") it slid off
> fairly often just when you didn't want it to. I found the used 914 I boug
ht
> had carbs that were no longer a matched set any more due to some wear in
> the piston throat, as the pistons were well out of sync. I bought two ne
w
> matched carbs and with that carb change, proper tuning, and cleaning my
> airbox to carb rubbers, all stayed where put and the engine ran flawless
> now for 10 years. Even after I upgraded the TCU to give me 40 inches
> takeoff power it stayed put.
>
> If equipped with old oil soaked hoses or a thin silicone discharge hose,
> or you left your carb to airbox hoses get really oil soaked, it is pruden
t
> to clean your airbox to carb rubber hose with acetone or similar solvent
to
> make them squeaky clean (or replace them). (Washing your intake plenum ou
t
> helps also.) To assist in security of a shaky engine, a couple of padded
> hose clamps and a piece of sheet metal could hold the airbox firmly to th
e
> ring mount to prevent slipping. Also, a couple of Adel Clamps and a piec
e
> of tube and bolts could work also on the older manifold without welding o
n
> a bung like the new airbox has. In a pinch, a piece of safety wire on th
e
> port side to the ring mount frame at the upper block bolt was also OK at
> preventing the plenum from slipping aft but only temporarily. A nicely
> made piece of .040 aluminum with a bit of a bevel for stiffness on the
> edges or a flute down the middle and nicely formed ends could in fact hol
d
> the box firmly in place and at the same time keep it from sliding off. T
o
> remove the carbs for cleaning, or to flush the accumulation of turbo oil
> out of the plenum after setting a long time, it only required removing th
e
> bolt between the Adels the two carb clamps and it was free.
>
> Once I had perfectly synchronized carb pistons and flew more often, I
> never again had an issue. Someplace in the shop I still have my Adel
> Clamps, a long bolt and tube just in case because I wondered about this n
ew
> silicone turbo hose I added this year and it's contribution to airbox
> security. Today my plane has sat for two years due to a wing delam repai
r
> and repaint, a number of upgrades and some other issues my old Classic ha
s,
> however, today my procedure is to suck the oil out of the turbo cold side
> before start if it has sat (for months) and it seems to run very well. I
> hope to get the motivation to fly it again this summer. It's too good of
> an airplane to just sit. My health is now pretty good, and I just flew a
> ride with a local instructor in a 172 and will fly some more proficiency
> flights to get my air sense back and return to Europa Flying. My civilia
n
> CFI says I'm more than proficient enough, however, he has some learning t
o
> do. There is a difference between currency and proficiency. I've only
> flown 2 hours in two years with 3 landings in the last 30 days which is n
ot
> proficiency in my book. Now to take him out and wring out the 172 and ge
t
> him to understand why an airplane does certain things and as an instructo
r
> know how to rectify student mistakes.
>
> Have fun guys, the flying season is now arriving. The spring storms will
> subside soon and adventure awaits...
>
> Bud Yerly
>
>
> ------------------------------
> *From:* owner-europa-list-server@matronics.com <
> owner-europa-list-server@matronics.com> on behalf of Roger Sheridan <
> rogersheridan@gmail.com>
> *Sent:* Saturday, April 6, 2024 8:21 AM
> *To:* Europa List <europa-list@matronics.com>
> *Subject:* Europa-List: 914 Airbox Support
>
m
> >
>
> Hi Everyone,
>
> I am refurbishing an XS 914 installation & am mildly concerned that the
> Rotax airbox/plenum seems to be only supported by the carb mount rubbers.
>
> During a heavy landing there must be a lot of stress there!
>
> On the 912S installation Europa support their lighter airbox with an
> aluminium strap to the engine frame.
>
> Has anybody added such a support to their 914?
>
> Grateful for any feedback from 914 operators.
>
> Best regards,
>
> Roger
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