Mike we are running 912's not 914's. Tony the balance tube should remain between the manifolds....it is for minor equalization of the 2 sides once balanced (see video on carb sync.). A pipe is added to the left of the tube for manifold pressure readings....but is only used for variable pitch prop.applications. Rob at Rotec research has sugessted a restrictor / oriface in the line to block the oil....but could not explain its presence....nor have I ever seen this ? Still stumped as the engine runs great...lots of power...motostat and compression checks good.
Food for thought and just a guess. Some bourdon tubes have fluid in the tubes. It makes them less susceptible to outside changes. The oil may have leaked out. If you remove that gauge and clean out the MAP tubing and put in a new gauge and there is no more oil then you have your answer. I would lean a little this way too since it is a small limited amount and an odd color.
Roger Lee LSRM-A & Rotax Instructor & Rotax IRC Tucson, AZ Ryan Airfield (KRYN) 520-349-7056 Cell
Could the oily liquid be some type of waxy coating from inside the pipe bore that either heat or fuel vapour has thinned and caused it to liquify and run into the instrument.
Just a long shot.
Mark
EDIT
Ive just read your post Roger, I think we posted at the same time, I think we are thinking on similar lines.
I really don't know how I read 914 instead of 912, I'll have to get new glasses.
On the same lines as above, could the continuous vacuum (plus heat mentioned above) be pulling oil or wax out of the tube inner diameter?
Mike G
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