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- Newsgroups: rec.autos
- Path: sparky!uunet!panther!mothost!schbbs!paccvm.corp.mot.com!RHK765
- From: RHK765@paccvm.corp.mot.com (B.M. Kwong)
- Subject: Re: Rotary vs. Piston Engines
- Organization: Motorola
- Date: 5 Nov 1992 13:37:54 HKT
- Message-ID: <1992Nov5.060351.5583@schbbs.mot.com>
- Sender: news@schbbs.mot.com (Net News)
- Nntp-Posting-Host: paccvm.corp.mot.com
- Lines: 30
-
- ------------------------- Original Article -------------------------
- Path: schbbs!mothost!ftpbox!uunet!charon.amdahl.com!pacbell.com!decwrl!sun-barr!
- From: chrisp@regenmeister.Sun.COM (Chris Prael)
- Newsgroups: rec.autos
- Subject: Re: Rotary vs. Piston Engines
- Message-ID: <lfg42bINNs43@exodus.Eng.Sun.COM>
- Date: 4 Nov 92 18:02:51 GMT
- References: <92309.094205KXN2@psuvm.psu.edu>
- Organization: Sun Microsystems Inc., Mountain View, CA
- Lines: 26
- NNTP-Posting-Host: regenmeister
-
-
- >However, a rotary engine the ratio of combustion chamber surface to
- >volume is much higher in a rotary engine than it is in a reciprocating
- >engine. Because the combustion chamber surface chills the burning of
- >the fuel mixture, this fact makes the rotary engine much less efficient
- >thermally than is the reciprocating engine. (It also makes the rotary
- >engine much dirtier.
-
- Also, the shape of the combustion chamber also has something to do with
- this issue. The semi-hemisphere is a quite efficient shape for a
- combustion to take place. As for the Rotary engine, the combustion
- chamber is in effect like a tiny stripe which make the spread of
- flame difficult. Mazda fixed it using twin sparks and a complex
- ignition system to fire one spark a little bit earlier. It is also
- because of the shape of the engine, a high compression ratio is
- very diffcult to achieve.
-
- B.M. Kwong
-