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- From: michal+@cs.cmu.edu (Michal Prussak)
- Subject: Re: What is the air pump used for?
- Message-ID: <Bw0ovD.C3B.2@cs.cmu.edu>
- Sender: news@cs.cmu.edu (Usenet News System)
- Nntp-Posting-Host: gs58.sp.cs.cmu.edu
- Organization: School of Computer Science, Carnegie Mellon
- References: <695.88.uupcb@chaos.lrk.ar.us> <29135@life.ai.mit.edu>
- Date: Mon, 12 Oct 1992 16:38:00 GMT
- Lines: 21
-
- In article <29135@life.ai.mit.edu> pwu@tang.ai.mit.edu (Peng Wu) writes:
- >It still puzzles me why cars cannot run a little bit lean. There was an
- >article on Boston Globe the other day about some invention for lean mixture.
- >It mentioned mixture of 20:1 but I am not sure what the mixture ratio the
- >invention used. The common mixture ratio is some 14.7:1. According to the
- >article, lean mixture tends to burn slower. The invention is about some high
- >energy ignition system which may be used on conventional cars already on the
- >road. The advantages are lower emission and higher fuel economy.
-
-
- Honda did this 15 years ago with their CVCC engines - used from 78-83
- on Accords, Preludes and perhaps some Civics. These engines have a
- small chamber around the spark plug, which gets normal mixture, while the
- main combustion chamber gets lean mixture. The spark ignites the
- normal mixture which in turn ignites the lean mixture in the main
- chamber. Since the auxiliary chamber is very small, the car runs
- on a lean mixture overall. I don't know if newer Hondas still have
- this design. Perhaps with fuel injection, this system is not needed
- anymore?
-
- Michal
-