RCU Forums - OS 40 fp engine istalled upside down

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gprs12

10-02-2005 07:16 PM

OS 40 fp engine istalled upside down

I've just completed a model P51d Mustang and have put in an OS 40 fp engine. the plans say for it to br upside doen. this has now put the pressure nipple on the muffler on the UNDERSIDE of it. Burnt oil seems to be getting into the fuel tank now. Would that be causing it to run spasmodically, i.e. increasing and decreasing in revs, then sometimes cutting out mid flight? Should I re-tap a hole on the now Top of the muffler for the pressure hole? thanks!!

nickj

10-02-2005 07:32 PM

RE: OS 40 fp engine istalled upside down

Sounds more like the engine's running too lean. It won't hurt to drill a new pressure hole, but I'd be surprised if it helped much. I might run a filter between the tank and carb.

smokingcrater

10-02-2005 07:43 PM

RE: OS 40 fp engine istalled upside down

i've run quite a few engines with the nipple directly on the bottom, a little oil coming through is never a problem. besides, if just adds to the oil content!

PipeMajor

10-03-2005 05:03 AM

RE: OS 40 fp engine istalled upside down

Quote:

ORIGINAL: smokingcrater

i've run quite a few engines with the nipple directly on the bottom, a little oil coming through is never a problem. besides, if just adds to the oil content!

Recycling!!! :D

Flypaper 2

10-03-2005 07:10 AM

RE: OS 40 fp engine istalled upside down

FPs run quite happily without pressure. Try it. You'll have to readjust the carb is all.

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