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1. 01:19 PM - Re: Re: Oil Burn (Bob Haas)
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Vent the oil separator back to the sump via a three way fitting at the sump
drain. No spots on my hanger floor at 333.8 Hobbs time. Bob Haas N380BH.
-----Original Message-----
From: owner-jabiruengine-list-server@matronics.com
[mailto:owner-jabiruengine-list-server@matronics.com] On Behalf Of dons701
Sent: Monday, July 06, 2009 10:58 AM
Subject: JabiruEngine-List: Re: Oil Burn
While I am new to the 2200A I have worked with many other types of piston
engines, racing and others. The 2200A is interesting in that there seems to
be no real control of oil mist and crankcase pressure, i.e. collective
combustion leakage past the rings normally found in all running piston
engines. I have not removed the oil pan but, according to the engine parts
manuals there is no crank scraper or windage tray as found in many race
engines to control the oil mist wrapped around a spinning crankshaft. This
crankcase pressure with mist and oil splatter obviously makes it's way out
of the engine by using the dipstick tube / oil vent hose. A system that
reduces or eliminates any liquid oil from making it's way out of the engine,
allowing only "dry" normal combustion pressure to be relieved, would be
optimal. Separating oil from the air would need to be done in stages by
mechanically removing as much oil mist as possible from the spinning crank
as said earlier, with scrappers !
and or a windage tray similar to any common race engine. Even a number of
circular fine mesh screens situated on the dipstick might baffle the liquid
oil but still allow gasses to escape.
The ultimate goal would not only be to eliminate the oil collection
bottle and retain oil in the engine, but would be to create a negative
pressure in the crankcase as this would increase power by making the rings
seal more efficiently. Initially as time allows, i will experiment with the
dipstick baffle modification and later, a way of creating crankcase vacuum
utilizing exhaust velocity in the exhaust pipe and report back on this site.
I know there are many creative people on this site that might have
already figured out some of these issues, or have better ideas :). If I am
missing something or I am not correct let me and others know, lets learn
together for the benefit of all. Thanks for reading, Don
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=251750#251750
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17:54:00
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