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Main Title An evaluation of a variable cam timing technique as a control method for oxides of nitrogen /
Author Thomson, John C.
CORP Author National Air Pollution Control Administration, Ann Arbor, Mich. Div. of Motor Vehicle Research and Development.
Publisher Division of Motor Vehicle Research and Development, National Air Pollution Control Administration, Department of Health, Education and Welfare,
Year Published 1970
Report Number 71-11; TAEB-71-11; APTD-1431
Stock Number PB-218 643
OCLC Number 41231033
Subjects Motor vehicles--Pollution control devices--Testing ; Nitrogen oxides--Measurement
Additional Subjects ( Automobile engines ; Air pollution control equipment) ; Exhaust gases ; Air pollution ; Performance evaluation ; Air pollution control ; Automobile exhaust ; Exhaust gas recirculation systems
Internet Access
Description Access URL
Library Call Number Additional Info Location Last
EKBD  EPA/APTD-1431 Research Triangle Park Library/RTP, NC 04/23/1999
ELBD ARCHIVE EPA APTD-1431 AWBERC Library/Cincinnati,OH 02/13/2024
ELCD  EPA TAEB-71-11 NVFEL Library/Ann Arbor, MI 05/07/2012 DISPERSAL
NTIS  PB-218 643 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation [2], 2 leaves ; 28 cm
Abstract A device to allow internal exhaust gas recirculation through variable camshaft timing was tested to determine its effects on exhaust emissions. This device made use of a vacuum diaphragm and associated circuits to vary the position of the camshaft in relation to the crankshaft as a function of engine load and speed. The vehicle used was a 1970 Plymouth Fury with a 383 cu. in. engine and automatic transmission. The following tests were conducted: (1) the 1970 Federal emission test procedure as used for certification of new motor vehicles (7-mode); (2) a closed, constant volume sampling technique using nine repeats of the Federal emission test cycle (9-CVS); (3) a closed, constant volume sampling technique using the LA4-S3 driving schedule as specified for 1972 and later. The following conclusions were drawn from the results: The variable cam timing device shows improvements in oxides of nitrogen; The use of this device would not meet 1973 emission levels except for oxides of nitrogen; This system appears to be more effective than external exhaust gas recirculation for oxides of nitrogen control.
Notes "October 1970." "71-11." "Division of Motor Vehicle Research and Development, National Air Pollution Control Administration, Department of Health, Education and Welfare." PB-218 643. APTIC No. 49692.
Place Published Place of publication not identified
Corporate Au Added Ent United States. National Air Pollution Control Administration.
PUB Date Free Form 1970
NTIS Prices PC A02/MF A01
BIB Level m
Medium unmediated
Content text
Carrier volume
Cataloging Source OCLC/T
OCLC Time Stamp 20240206213016
Language eng
Origin OCLC
OCLC Rec Leader 02136cam 22004337a 45010