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oinl distribution within the engine block

 
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javisteele(at)sympatico.c
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PostPosted: Thu Nov 19, 2009 10:24 am    Post subject: oinl distribution within the engine block Reply with quote

HI Guys,

Does anyone have a copy of the Lycoming engine picture that shows the route that oil goes through in the engine block while the oil is cool and later when the oil is hot and the thermovalve opens.

And does all the oil go through the cooler before going into the engine galleries? or does only some of the oil go through the cooler while most of the oil goes through the engine./

Cheers,

Jack Steele
Tailwind C-FSNY
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ad4hk2004(at)yahoo.com
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PostPosted: Fri Nov 20, 2009 4:20 am    Post subject: oinl distribution within the engine block Reply with quote

Jack,
The oil cooler is a full flow as long as there is not excessive back pressure, such as the oil congealing in the cooler... Once the back pressure reaches a set point it blows open a bypass valve that sends the oil around the cooler...
As far as the order in which the oil circulates through the passages very roughly (from memory)
1. main oil gallery in right crankcase half to:
A) Main bearings, and through them in spurts to the connecting rod bearings
B) From rear main bearing to:
a] crankshaft idler gears
b] cam bearings
c]hydraulic tappets
c]push rods (spurts again)
  d] rocker arms (which are at the end of a very long, tortuous path of spurts)
e] and finally the valve stems get coated from oil mist (which is why they wear like crazy)

Someone who really knows can chime in...

denny / k8do

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