Do you have an engine monitor that does data logging that you could extract?
NorthernDirk wrote:
Even the propeller has been overhauled, as the plane was rolled into a taxiwayamp by the maintenance staff…This happened during one of the many attempts of an maintenance shop to solve the problem
This would require not only the propeller to be overhauled but a complete shock loading inspection! Dont let the shop get away with that…
Check the exhaust system for insecure baffles in the muffler.
Check the flexible fuel lines with a ball bearing for flow in both directions and then do a flow check on the whole airframe fuel system.
Still no answer regarding engine instrumentation… something fishy is going on here.
The analog fuel flow readout is just measuring the pressure coming out of a spare port of the flow divider. So if the injectors were all blocked, you could still see “flow” indicated. Only a proper flowmeter will show fuel flow.
I’ll try to summarize:
The report is:
-Very marked loss of power on the ground and in the air, only when hot and cowled. Also when using an independent fuel system and with aux electric fuel pump on or off.
-The indications are:
Loss of airspeed (in the air)
Loss of RPM (on the ground)
Loss of FF (-2GPH)
This information will direct troubleshooting in one direction or another.
Back in my schooldays, when I was a tinkerer buying and selling used mopeds and cars (lots of times with aircooled little carburetor engines), an engine losing power when hot meant mostly:
- a problem with the ignition coil
- insufficient compression – to be checked while engine is hot,
- intake system getting hot and sucking in hot air, resulting in loss of oxygen
- or a problem with the mixture becoming too rich when hot, comparable to constant choke. Since there’s no choke, there might be a problem with the mixture knob
I would strongly suggest to look at the ignition, intake and mixture control. After all, it’s an aircooled boxer engine :)
Thank you for all the answers and thoughts on our problem….I have been very busy for the last few days
At the weekend we meet once again at the Aircraft, and log everything more precise !
As I have already mentioned, is the governor still in the overhaul, as soon as it is installed we know more!
The exaust is brand new, magnetos and engine have less then five hours…
Polypragmatic therapeutic approach without proper diagnosis. You really replaced all the periphery of the engine and the engine itself?