How do air/fuel ratio and injection timing affect engine output and BSFC?

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krish1988
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I have few questions as i am bit confused

Q1. I want to know what are the influence of the air/fuel ratio on engine output and Brake specific fuel consumption (BSFC).

Q2. why bsfc increases at low engine output?

Q3. why bsfc improves as engine output increases?

Q4. what are the effects of early and late injection timing?
 

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What sort of engine are you enquiring about?
 
i am looking at Ricardo E6 C.I. Engine. I just want to know general influences.