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Relation of Fuel-Air Ratio to Engine PerformanceThe tests upon which this report is based were made at the Bureau of Standards between October 1919 and May 1923. From these it is concluded that: (1) with gasoline as a fuel, maximum power is obtained with fuel-air mixtures of from 0.07 to 0.08 pound of fuel per pound of air; (2) maximum power is obtained with approximately the same ratio over the range of air pressures and temperatures encountered in flight; (3) nearly minimum specific fuel consumption is secured by decreasing the fuel content of the charge until the power is 95 per cent of its maximum value. Presumably this information is of most direct value to the carburetor engineer. A carburetor should supply the engine with a suitable mixture. This report discusses what mixtures have been found suitable for various engines. It also furnishes the engine designer with a basis for estimating how much greater piston displacement an engine operating with a maximum economy mixture should have than one operating with a maximum power mixture in order for both to be capable of the same power development.
Document ID
19930091255
Document Type
Other
Authors
Sparrow, Stanwood W
Date Acquired
September 6, 2013
Publication Date
January 1, 1925
Report/Patent Number
NACA-TR-189
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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