Jim & Heather,
I don't know if this has been suggested by anyone else, but check the carb bowl
pressurization lines from the air box to the carbs. If there's a leak somewhere
along there, it could prevent your carbs from being able to deliver sufficient
fuel under boost. In the attached PDF file these lines are RED, GREY/WHITE
STRIPE and YELLOW. Check VERY carefully! I had two hidden that took three
or four searches to locate. Look carefully at any connection from line to
fitting.
If that all checks out OK, then you might also check the carb bowl pressure
shuttle
(92 in the PDF) which transfers from lower pressure input to higher pressure
input when you go to high boost. This can be checked by making the purple
connection. Disconnect the YELLOW line from the shuttle and the RED line from
the airbox. Connect the YELLOW line to the airbox where the RED line was
removed.
This information was provided by the folks up at Rotax Owner dot Com and
they said that it will not harm anything to run like this till you can get
home and get a replacement shuttle.
I hope this helps. Good luck!
Blue skies & tailwinds,
Bob Borger
Europa XS Tri, Rotax 914, Airmaster C/S Prop.
Little Toot Sport Biplane, Lycoming Thunderbolt AEIO-320 EXP
3705 Lynchburg Dr.
Corinth, TX 76208-5331
Cel: 817-992-1117
rlborger@mac.com
On Oct 21, 2012, at 4:47 PM, "h&jeuropa" <butcher43@att.net> wrote:
We are stuck in Lamar CO with 914 problems. Have spent most of the day talking
to Bud for ideas. Flew about 4 hours yesterday, stopped for fuel and lunch.
Takeoff was normal but when leveled off, noted fuel flow was only 3.5 gph, not
the expected 5.5. Increasing throttle gave more MP but same fuel flow. Engine
felt rough or different than normal.
Landed and inspected under cowl - no problem noted. We had just gotten fuel so
thought maybe that caused it. Tried flight this morning when it was cooler,
had to make emergency landing because power dropped soon after takeoff. No
vibration,
just wouldn't climb. Found that our fuel tank vent was plugged, cleared
it, ran ground tests & Jim did 20 minute solo test flight with no problem.
Loaded plane & departed again, engine power dropped just after gear retract,
made another emergency landing. (Obvious answer is don't let Heather in the
plane [Wink] )
At this point we're thinking pull carbs for rebuild. Any other ideas?
Thanks, Jim & Heather N241BW
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