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- Path: sparky!uunet!stanford.edu!agate!usenet.ins.cwru.edu!po.CWRU.Edu!aas7
- From: aas7@po.CWRU.Edu (Andrew A. Spencer)
- Newsgroups: rec.autos
- Subject: Re: Rotary vs. Piston Engines
- Date: 5 Nov 1992 22:38:23 GMT
- Organization: Case Western Reserve University, Cleveland, OH (USA)
- Lines: 48
- Message-ID: <1dc7ovINNhu1@usenet.INS.CWRU.Edu>
- References: <Bx9FGz.6z8@mentor.cc.purdue.edu> <184132@pyramid.pyramid.com>
- Reply-To: aas7@po.CWRU.Edu (Andrew A. Spencer)
- NNTP-Posting-Host: slc5.ins.cwru.edu
-
-
- In a previous article, mshar@mentor.cc.purdue.edu (Mike Mshar) says:
-
- >>lstowell@pyrnova.pyramid.com (Lon Stowell) writes:
- >>> mshar@mentor.cc.purdue.edu (Mike Mshar) writes:
- >>>> Karl Nordstrom <KXN2@psuvm.psu.edu> writes:
- >>>>How is the rotory lubricated? Does oil get into the fuel?
- >>>
- >>>That`s a damned good question. Without the reciprocation, how is the oil
- >>>kept from getting into the combustion area and burning with the rest of the
- >>>fuel??
- >>>
- >>>Hmmmmmm...
- >>>
- >>>Anybody with a rotary want to take this??
- >>>
- >> Well, considering that on a reciprocating engine, SOME oil DOES
- >> get into the combustion chamber and gets burned with the fuel.
- >>
- >> And as the rings wear, more and more oil makes its way into the
- >> combustion chamber.
- >>
- >> On the rotary, the tips of the rotor seals are lubricated with
- >> oil....rather like the rings on a piston engine.
- >
- >Well, that still doesn`t answer my question. In a reciprocating engine, the
- >piston moves upward in the cylinder, spreading a film of oil as it goes.
- >Once the piston reaches TDC, it starts travelling downward, taking most of
- >the oil with it, because of the rings. Now, I realize that a small amount
- >of oil remains on the cylinder wall, because piston rings are not perfect.
- >
- >Now, with a rotary, what part of the engine pushes the film of oil back
- >away from the combustion chamber?? This is what I am asking.
-
- consider the simplest of two stroke piston motors. they mix fuel with oil
- this is how the motor recieves it's lubrication, by the oil and fuel coating
- the wall before it is burned and expelled. this is also how the seals are
- lubed in the rotary, the oil is inhaled with the air/fuel/whatever, and
- lubes the lobes/tips just before being burned and expelled. Thus, higher
- emmissions, etc. however, the tips of the seals are all that are being
- (or in need of) lubed. thus, the rotary uses less oil to complete the
- job, which then enables them to use virtually the same technology, only
- less oil. does this answer it?..the lubrictiing oil is burned and exhausted.
- DREW
- --
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