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richard.goode(at)russiana
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 Posted: Thu Feb 14, 2013 1:55 am Post subject: oil drain - down and crankshaft position |
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From my discussions with my friend, Sergio Dallan, who first developed the concept of a "tap" in the oil supply, and the crankcase "window", the rationale for leaving the engine with the crankshaft throw in the vertical position had nothing to do with the resultant position of the Pistons, but was simply that, in its highest position, the oil flow into the crankshaft and then out was far less.
Richard Goode Aerobatics
Rhodds Farm
Lyonshall
Hereford
HR5 3LW
Tel: +44 (0) 1544 340120
Fax: +44 (0) 1544 340129
www.russianaeros.com
[quote][b]
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mark.bitterlich(at)navy.m
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| Posted: Thu Feb 14, 2013 2:57 pm Post subject: oil drain - down and crankshaft position |
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Would that be the result of after shut-down oil drainage coming off the
top of the engine? If correct, then I can grasp that explanation.
If so, then that would also mean that it would not impact oil seeping
past the check valve and into the sump what-so-ever, correct? Yes/No?
Mark
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richard.goode(at)russiana
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| Posted: Fri Feb 15, 2013 1:29 am Post subject: oil drain - down and crankshaft position |
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By definition, the only way that oil gets into the standing engine is
through the oil pump, and, by implication, the check valve.
In passing, I can see that turning the propeller backwards before leaving
the aircraft could well help to seat the check valve, remembering it is only
held shut with a very light spring. Of course the oil pressure against the
valve will soon stop, but, possibly, after helping the valve to seat in the
first place.
But the point of having the crankshaft in its highest position (as seen
through the "window") is that this dramatically reduces the amount of oil
that comes out of the crankshaft, of course originally from the oil pump,
and then seeps out of the bearings and flows downwards under gravity.
Richard
Richard Goode Aerobatics
Rhodds Farm
Lyonshall
Hereford
HR5 3LW
Tel: +44 (0) 1544 340120
Fax: +44 (0) 1544 340129
www.russianaeros.com
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