Stoichiometric Air-Fuel Ratios of Automotive Fuels

Standard:
Reaffirmed:
  • 1997-12-01
 
Publisher:
  • SAE International
Pages:
11
Scope:

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. The ratio varies appreciably over the wide range of fuels—gasolines, diesel fuels, and alternative fuel—-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 of 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.

History:
Standard Published Revision Status
J1829_201503 2015-03-17 Latest Revised
2002-10-31 Historical Reaffirmed
1997-12-01 Historical Reaffirmed
1997-12-01 Historical Revised
1987-06-01 Historical Issued
AKA:
  • SAE J 1829
Sector:
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