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Record Details

Record 37 of 2628
Lean mixture engine testing and evaluation program. [for automobile engine pollution and fuel performances]
Author and Affiliation:
Dowdy, M. W.
Hoehn, F. W.
Griffin, D. C.(California Institute of Technology, Jet Propulsion Laboratory, Pasadena, Calif., United States)
Abstract: Experimental results for fuel consumption and emissions are presented for a 350 CID (5.7 liter) Chevrolet V-8 engine modified for lean operation with gasoline. The lean burn engine achieved peak thermal efficiency at an equivalence ratio of 0.75 and a spark advance of 60 deg BTDC. At this condition the lean burn engine demonstrated a 10% reduction in brake specific fuel consumption compared with the stock engine; however, NOx and hydrocarbon emissions were higher. With the use of spark retard and/or slightly lower equivalence ratios, the NOx emissions performance of the stock engine was matched while showing a 6% reduction in brake specific fuel consumption. Hydrocarbon emissions exceeded the stock values in all cases. Diagnostic data indicate that lean performance in the engine configuration tested is limited by ignition delay, cycle-to-cycle pressure variations, and cylinder-to-cylinder distribution.
Publication Date: Jan 01, 1975
Document ID:
19750061863
(Acquired Dec 01, 1995)
Accession Number: 75A45935
Subject Category: ENGINEERING (GENERAL)
Document Type: Conference Proceedings
Publication Information: (SEE A75-45920 23-44)
Publisher Information: United States
Meeting Information: Energy 10; Annual Intersociety Energy Conversion and Engineering Conference; 10th; August 18-22, 1975; Newark, DE
Contract/Grant/Task Num: NAS7-100
Financial Sponsor: NASA; United States
Description: 9p; In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: Copyright
NASA Terms: AUTOMOBILE ENGINES; COMBUSTION EFFICIENCY; ENGINE TESTS; FUEL CONSUMPTION; POLLUTION CONTROL; AIR POLLUTION; EXHAUST GASES; HYDROCARBON COMBUSTION; PROPULSION SYSTEM PERFORMANCE
Imprint And Other Notes: In: Energy 10; Annual Intersociety Energy Conversion and Engineering Conference, 10th, Newark, Del., August 18-22, 1975, Record. (A75-45920 23-44) New York, Institute of Electrical and Electronics Engineers, Inc., 1975, p. 150-158.
Availability Source: Other Sources
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