914 losing power at hi altitude

Hello, I fly a Dynamic WT9 Turbo (Rotax 914 UL) since 7 years.

I Wake up this thread because I had for the first time the last 27 of march the same problem than RLM.

The appearance of the breakdown is random : around 7000 ft, the engine sundenly runs rough, loses power and has misfires. Up to 5-6000 ft, no problem.

Since then, here are the parts changed by my maintenance workshop : carburetor tanks, floats, gas pressure regulator. Without success… If during some test flights, the problem seemed solved, he reappears later…

There are same problems relates on several forums… many description, but no definitive solution.

Did anyone advance on the subject ?

Thank you for advance.

Hi, 

Kindly guidance required after how you resolved your problem of power loss?

We have same problem on Rotax 914F.

Awaiting 

bien accueillir

Hi,

Problem not resolved at this moment. Many pieces have been changed on carburators without effect. We are looking toward changing turbo... Very expensive and no guaranty of succes. Problem known by everybody (cf posts on many forum), but neither rotax nor its regional importers have solution. But they sell with pleasure spare parts that do not solve the problem . Friendly yours. JL

When it runs rough, What is the RPM?,  Manifold Pressure?,  EGT?

How do these compare to just before the problem occures?

Hi,

When the problem appears, all parameters are nominal : rpm 5000, AP 31', all temp OK. On adverse, only the fuel flow decrease in few seconds from 23 l/hr to +/- 15 l/hr. The aux pump don't change anything. Whem I descend from up to 6500 ft to 4-4.500 feet, fuel flow becomes again normal.