Originally Posted by
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Andy has my vote also. ( Hate admitting that) If it runs outside then it is in airflow set up. If it does not, which I'll bet it doesn't, then its in the engine. Make sure you don't do your test run in bright sunlight. It may mask some flame you won't see. The most likely way you get flames out the back is too much fuel in the combustion chamber. Un-burnt and wet fuel into exhaust. RPM sensor, Fuel pump advance settings, would be my best guess.
Interesting and keep us up to date. Good Luck
Mate, I am open to all suggestions - just bear in mind that I have used more than one engine, ECU and temp probe in this situation. I have 3 of exactly the same engines installed with exactly the same bypasses in three different airframes, BUT only in this installation do I have the problem. I might also add that all the ECU's have exactly the same setups. So can it really be the engine on it's own, without the bypass setup inducing the result?
From all the advice I'm getting it seem to me that Andy and Andre, both have very good insight. Both of them are pretty much saying the same thing. Compressor stall - either way the turbine is being over fuelled.
I am just waiting for my fireX to be refilled before I run some tests, will let you know.
Thanks for helping.
Jan