Hi Dave,
Look at the throttle cable inners just as they disapear into the outers in
side the throttle lever box, if you slam open the throttle, does one of th
e cables kink and get ''left behind'' ?
I have seen both the symptoms you describe caused by that.
Cheers,
Nev.
-----Original Message-----
From: Moore, Dave <Dave.Moore@lr.org>
Sent: Mon, 4 Oct 2010 9:55
Subject: Europa-List: Poorly Rotax 914
Rotax 912/914 Gurus,
I=99ve been building a Europa for most of my leisure time for the pa
st seven years. Now I seem to be falling at the final hurdle.
A few years ago, I bought a 914 with seven hours on the clock. The engine
is now fitted to the aircraft and has passed all its tests (fuel flows,
fuel pressure, oil pressure, operating temps). We are still ground runni
ng / testing. The carbs are mechanically and pneumatically balanced and
the engine starts easily (every time).
We have run the engine through the full throttle range, up to 5700 RPM.
However, sometimes when we advance the throttle, the engine cuts.
Sometimes this happens before we reach the 100% gate, sometimes we get pas
t the gate and it cuts when we push it to 115%. At all times, there is a
noticeable =9Cflat spot=9D as we accelerate the engine up fro
m about 2000 RPM to 3500/4000 RPM.
Another troubling aspect of the engine's operation is that when the engine
is started with choke (from cold) it cuts when the choke is released, no
matter how much warming it has had. The engine can then be readily resta
rted without choke, whereupon it will run sweetly =93 bar the behavi
our described above
The fuel filters are clean and it will run happily at 4000+ RPM when it ge
ts there. It does not appear to be fuel pumps, both pumps give very healt
hy flow rates, (when tested with the fuel pressure regulator pressurised
to 5.1 -5.8 PSI (per the Europa manual)).
I have to admit to having reached the limits of my mechanical competence.
In an ideal world I would contact the local expert, who would apply thei
r wisdom, however, I live in the wilds of Scotland (Aberdeen), and Rotax
914 gurus are thin on the ground up here (to the best of my knowledge).
So, before I have to resort to importing a Rotax guru from England-shire,
I wonder if any of you technical wizards on this forum has come across si
milar behaviour on a 914 (or a 912, because I don't think it is turbo rela
ted) and could shed some light on my darkness.?
With thanks and regards,
Dave
Dave Moore
XS Monowheel #550
Aberdeen, UK
Tel: Day: 01224 267815. Home: 01224 572041
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