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Equivalence ratio

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Hi Guys,

In my many years of reading SAE papers (starting with the classic Honda RA168E paper - I have noticed that they refer to an equivalence ratio, as opposed to lambda or an AF/R.

Does anyone know why SAE use this value as opposed to lambda?



Equivalence Ratio is just the inverse of Lambda (ie. Eq = 1/Lambda). It is thought of as the percentage of excess fuel relative to stoichiometric combustion.

Thanks David, that makes sense as it's usually mentioned in the context of BSFC.