danmas Dan Masters Alcoa, Tennessee (578 posts) Registered: 10/28/2007 12:11AM Main British Car: 1974 MGBGT Ford 302 |
Upside down lubrication.
OK, I'm not as sharp as I should be. Not only do I miss the answer, I far too often miss the question. In the report on the 2008 V8 meet, there was a bit about a 215 aluminum V8 being used upside down in an airplane. [www.britishv8.org]
Normally, oil is pumped through the engine and then it drains back to the sump for recirculation. In this case, the oil would drain back to the valve covers and the underside of the pistons. I've seen airplanes fly upside down many times, but it never occured to me until now to question the oiling system operation when upside down. How is that dealt with? |
Re: Upside down lubrication.
They use an inverted oil system:
[www.aircraftspruce.com] The fuel system is a header tank or flop tubes in the tanks for inverted flight. Fuel injected engine. |
flitner John Fenner Miami Fl (168 posts) Registered: 03/11/2010 10:58AM Main British Car: 1972 MGB 350 CHEVY |
Re: Upside down lubrication.
The oil system pulls off of a specially designed upper pickup in the crankcase, working off of gravity in an upside down/inverted flight situation for an unlimited time,however the fuel sump in the airframe makes up for +- 60 seconds of inverted flight on a aerobatic manuever as per a 69 Citabria "Airbatic" spelled bakerds!
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roverman Art Gertz Winchester, CA. (3188 posts) Registered: 04/24/2009 11:02AM Main British Car: 74' Jensen Healy, 79 Huff. GT 1, 74 MGB Lotus 907,2L |
Re: Upside down lubrication, with a girdle ?
I.E. "side oiler girdle' for Rover. Monoblock design as main caps and girdle are one piece. Main oil galley machined in girdle, feeds lateral ports to lower bearing halves. Initially thought was to have these lines feed nearly horizontal into bearing shells. Great for "swirl and wedge effect", but bad for feeding oil into crank oil holes,(to rods).Good compromise angle ? Since this is true "priority oiling", I suspect a reduced port size to lube cam bearings should be required. Mechanical roller lifters to be splash lubed. Rockers lubed by external lines to shafts. Anyone? Thanks, roverman.
Edited 2 time(s). Last edit at 10/31/2010 06:18PM by roverman. |
roverman Art Gertz Winchester, CA. (3188 posts) Registered: 04/24/2009 11:02AM Main British Car: 74' Jensen Healy, 79 Huff. GT 1, 74 MGB Lotus 907,2L |
Re: Upside down lubrication.
Wotland, so pfunny ? The engine needs the girdle, so crank does'nt get "cranky"-get it ?
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