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hansjd(at)online.no
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 Posted: Mon Apr 08, 2013 8:03 am Post subject: Drop in RPM/Mag drop |
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Engine Gurus!
The engine (914) of the Europa I built, and subsequently sold is not up to acceptable standards. The new owner experienced a drop in RPM combined with a cracling noise in the head set. The Flydat also went temporarly black. He was barely able to maintain altitude and on return to the airfield he switched on the secondary fuel pump. After awhile the engine regained power. In the heat of the moment he forgot to check the fuel pressure when the engine was faltering.
During investigation we experienced a slight delay on initial switching of the fuel pump - till we heard the familiar sound of the pump. During later switching everything was normal.
We have tried everything - jigling contacts with pump running, changing to another switch on the panel and even checked the battery itself, to no avail. We are about to run out of ideas.
This may be a separate snag in itself. When running the engine the Mag drop was unaceptably high - 400 rpm on Left and 300 rpm on Right magneto. We regapped the plugs to 0.70 mm, but no effect. We noticed though that both plugs on Cylinder 1 were black with soot while all the others were normal grey. After cleaning the plugs and running for a few more minutes, the plugs got all black again. What could this be - a compression leak? I am ruling out the carburetor, since the plugs on the other cylinder on the same side - which is being fed from the same manifold - was normal grey.
I'm tossing out these problems to all you knowledgeable people in the group. Any with a good advice??
Cheers, Hans - ex LN-HJD
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pestar
Joined: 11 Apr 2007
Posts: 61
Location: Auckland, New Zealand
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ploucandco
Joined: 16 Sep 2007
Posts: 69
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| Posted: Tue Apr 09, 2013 1:12 am Post subject: Re: Drop in RPM/Mag drop |
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Hans, how much time was the plane in the hangar without engine running? I got pretty much the same issues after 3 months of heavy winter: snow and ice that prevented me to use the plane. Cracks in the radio and the 914 engine running squared due to oil in the air system.
The cracks in the radio disappeared after some minutes of communications, I suspect some oxydation.
The oil in the air system came from the turbo check valve that has weeped during the storage period. The oil needs to be cleaned from the airbox and the spark plugs. Also the carbs need to be checked if there is no residual oil.
Hope this helps, Jacques.
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