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SAE J1829 (MAR2015)

Current Revision

Stoichiometric Air-Fuel Ratios of Automotive Fuels

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The mass of air required to burn a unit mass of fuel with no excess of oxygen or fuel left over is known as the stoichiometric air-fuel ratio. This ratio varies appreciably over the wide range of fuels - gasolines, diesel fuels, and alternative fuels - that might be considered for use in automotive engines. Although performance of engines operating on different fuels may be compared at the same air-fuel ratio or same fuel-air ratio, it is more appropriate to compare operation at the same equivalence ratio, for which a knowledge of stoichiometric air-fuel ratio is a prerequisite. This SAE Recommended Practice summarizes the computation of stoichiometric air-fuel ratios from a knowledge of a composition of air and the elemental composition of the fuel without a need for any information on the molecular weight of the fuel.

SDO SAE: SAE International
Document Number J1829
Publication Date March 17, 2015
Language en - English
Page Count 10
Revision Level 201503
Supercedes
Committee
Publish Date Document Id Type View
March 17, 2015 J1829_201503 Revision
Oct. 31, 2002 J1829_200210 Revision
Dec. 1, 1997 J1829_199712 Revision
May 1, 1992 J1829_199205 Revision
June 1, 1987 J1829_198706 Revision