Stoichiometric Air-Fuel Ratios of Automotive Fuels

Standard:
Revised:
  • 2015-03-17
 
  • CURRENT
Publisher:
  • SAE International
Pages:
10
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. 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.

Rationale:

A recent SAE paper has been added to the references and its used discussed. For clarity, the references have been numbered and footnotes modified.

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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