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[quote]QUOTE: Overmod Posted: 08 Aug 2004, 23:48:08 <br />Imho, not exactly, BRF: <br /> <br />You are throwing away some theoretical efficiency if you underfuel, but some additional oxygen over 'stoichiometric' charge won't hurt the engine's operation. That's a key difference between throttled automobile engine operation (Otto cycle) and compression ignition... <br /> <br />Diesels always want to operate with an 'excess' of combustion air, because the ignition transition energy is supplied implicitly in the hot compressed charge air at the time of fuel injection. There is no reliance on rich kernels or torches to light off the fuel charge, no need for weird stratified charge, etc. (IDI with Ricardo swirl is a bit of a different case, dealing with preheat and effective pre-quench mixing of injected fuel and air when less-than-ideal atomizing, fuel charge mass, etc. are used). <br /> <br />The turbo lets you burn more fuel per stroke without an overfueling (smoke, etc.) penalty. Underfueling is as simple as injecting less fuel... what you do inject will still go substantially to 100% even if effectively very lean. This is a major contributor to the 'fuel efficiency' of compression-ignition motors... [/quote] <br /> <br />I had my mind on Otto instead of compression.
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