73-23 RBM
Interim Report on
1975 Light Duty Vehicle Emissions
Correlation Program as of April 10, 1973
(Domestic Manufacturers)
April 1973
Emission Control Technology Division
Office of Air and Water Programs
Environmental Protection Agency
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Background
The 1975-76 exhaust emission standards require measurement
of exhaust emissions with a different test procedure and
at much lower pollutant concentration levels than has been
common in previous certification testing. It is necessary
to assure that all of the laboratories, involved in the cert-
ification process are. capable of obtaining comparable and
reproducible results and to continue to assess questions of
variability and technology development.
Purpose
The purpose of this correlation is to test 1975-76 prototype
vehicles from as many vehicle manufacturers as are willing to
participate. By comparing EPA's data to the manufacturer's
own data, problems can be identified and resolved prior to
the start of the certification cycle. It is planned that this
will be a continuing project through FY74.
Test Procedure
Testing is performed according to the 1975 Federal Test Procedure,
Details of this procedure can be found in the November 15, 1972,
Federal Register. Testing includes the full evaporative emission
procedure except in the case of the Chrysler cars.
Test Results
Test results are presented in the Appendix of this report. In
addition to emission results, fuel consumption was calculated
for each of the EPA tests using a carbon balance technique; the
manufacturers did not supply fuel consumption data.
Conclusions
As this is an interim report on a continuing correlation program
between the U.S. manufacturers and EPA, no conclusions can be
offered at this time.
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APPENDIX
GM 1975 Prototypes
Vehicle 0-2931 Oldsmobile 98 / 5500 lb., 455 CID
Odom: 23,906 CCS/EGR/EI/Ox. Conv.
HC CO C02 NOx MPG
EPA Test 1 .46 7.15 1160 1.98 7.7
TTA Test 2 .46 2.27 1082 1.53 8.4
GM Test .48 2.64 --- 1.69
Vehicle ch-22769 .Chevrolet Impala, 5000 lb., 400 CID
Odom: 12,782 Air/EGR/EI/Ox.Conv.
HC CO C02 NOx MPG
EPA Test 1 .32 1.63 1075 2.05 8.5
EPA Test 2 .34 . 1.91 1046 1.99 8.8
GM Test .30 1.53 --- 2.10
Vehicle C-2240 Cadillac Calais, 5500 lb., 500 CID
Odom: 28.238 Air/EGR/Ox. Conv.
HC CO C02 NOx MPG
EPA Test 1 .48 .81 939 1.86 9.5
EPA Test 2 .38 1.05 937 1.78 9.5
GM Test .36 1.31 967 1.50 ---
Vehicle B-5293 Buick LaSabre , 5000 lb., 350 CID
Odom: 22,881 Air/EGR/EFE/Ox. Conv./El
HC CO C02 NOx MPG
EPA Test .39 2.58 855 2.05 9.4
GM Test .39 2.94 864 1.74
Vehicle P-2444 Pontiac Catalina , 5000 lb., 400 CID
Odom: 21,181 Air/EGR/EFE/Ox. Conv./El
HC CO CO, NOx MPG
Łt
EPA Test 1 .20 1.50 889 1.55 10.2
EPA Test 2 .19 1.65 896 1.54 10.2
GM Test .30 1.54 914 1.83
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Vehicle B-2262 Buick Skylark, 4500 lb., 350 CID
Odom: 24,296 Air/EGR/Ox. Conv./EFE/EI
HC CO C02 NOx MPG
EPA Test 1 .25 1.75 868 1.69 10.3
EPA Test 2 .32 1.95 856 1.90 10.4
GM Test .30 2.21 890 1.77
Vehicle 0-2932 Oldsmobile 98, 5500 lb., 455 CID
Odom: 32,102 CCS/EGR/EI/Ox. Conv.
HC CO CO 2 NOx MPG
EPA Test .31 2.49 1000 1.47 9.0
GM Test .31 3.45 1093 2.01
Vehicle ES 62370 Chevrolet Belair, 4500 lb., 350 CID
Odom: 21, 196 Air/EGR/Dual Ox. Conv.
HC CO CO 2 NOx MPG
EPA Test 1 .45 2.21 781 2.36 11.6
cPA Test 2 .32 1.50 796 2.08 11.4
GM Test .33 2.25 827 2.42
Vehicle C-2242 Cadillac Calais, 5500 lb., 500 CID
Odom: 24,175 Air/EGR/Ox. Conv.
HC , CO COz NOx MPG
EPA Test 1 .10 1.81 898 2.28 9.9
EPA Test 2 .12 2.29 762 1.96 11.0
GM Test (not given)
Vehicle C-2243 Cadillac Calais, 550.0 lb., 500 CID
Odom: 21,778 Air/EGR/Ox. Conv./El
HC CO C02 NOx MPG
EPA Test 1 .24 3.83 1059 2.32 8.3
EPA Test 2 .28 2.02 975 2.50 9.0
GM Test .31 3.66 1137 2.26
Vehicle B-82147 Buick Electra, 5500 lb., 455 CID
Odom: 50,396 Air/EGR/Ox. Conv./EFE/EI
HC CO C02 NOx MPG
cFA Test .31 1.68 1014 1.88 8.8
GM Test .27 1.61 997 1.13
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Vehicle P-2223 Pontiac LaMans, 4500 Ib., 350 CID
Odom: 20.056 Air/EGR/Ox. Conv./EFE/EI
HC CO C02 NOx MPG
EPA Test 1 .44 2.64 1010 1.96
EPA Test 2 .34 2.28 962 1.84
EPA Test 3 .26 1.85 952 1.70
GM Test .44 3.28 1009 2.35
8.8
9.1
9.2
Vehicle B-2262 Buick Skylark, 4500 Ib. , 350 CID
Odom: 50 j 240 Air/EGR/Ox. Conv./EFE/EI
HC CO C02 NOx
EPA Test .28 1.10 911 1.93
GM Test .39 3.75 890 1.80
Vehicle ch-25169 Chevrolet Vega, 2750 Ibs
Odom: 22,094 Air/EGR/Ox. Conv.
HC CO CO 2 NOx
EPA Test 1 .33 2.15 519 1.83
EPA Test 2 .42 2.29 546 2.19
GM Test .52 2.68 492 1.80
Vehicle C-2241 Cadillac Calais/ 5500 Ibs.
Odom: 21^345 Ox. Cat.
HC CO CO 2 NOx
EPA Test 1 .33 2.05 1079 2.36
EPA Test 2 .53 2.72 1051 2.34
GM Test .40 2.97 1105 2.45
Vehicle B-1258 Buick Skylark/ 4500 Ibs.,
Odom: 50,101 Air/EGR/Ox. Conv./EFE/EI
HC CO C02 NOx
EPA Test 1 .32 2.42 922 1.47
EPA Test 2 .27 2.12 882 1.46
GM Test .37 2.89 912 1.29
MPG
9.7
. , 140 CID
MPG
16.9
16.0
, 500 CID
MPG
8.2
8.2
350 CID
MPG
9.7
9.9
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Chrysler 1975 Prototypes
Vehicle 12 M 467 Plymouth Fury, 4500 Ibs., 360 CID EPA
System miles: approx. 50,000
HC CO C02 NOx MPG
EPA Test 1 .34 4.11 764 2.80 11.6
EPA Test 2 .37 3.38 767 2.76 11.6
EPA Test 3 .54 6.43 721 2.25 12.1
EPA Test 4 ..43 4.83 742 2.63 12.0
Chry.Test 1 .46 3.56 762 4.36
Chry.Test 2 .37 3.35 792 3.14
Chry.Test 3 .93 4.80 667 2.49
Vehicle 12 M 414 Plymouth Fury 450° lbs•» 36° CID EPA
Odom: 52,284
HC CO CO 2 NOx MPG
EPA Test 1 .22 1.56 747 2.25 11.9
EPA Test 2 .23 2.13 758 2.10 11.8
EPA Test 3 .43 3.00 757 2.02 11.8
EPA Test 4 .27 2.00 750 1.94 11.8
Chry.Test 1 . .64 3.01 719 2.01
Chry.Test 2 .34 2.86 766 2.24
Chry.Test 3 .83 3.70 797 1.74
Vehicle 12 M 497 Plymouth Fury/ 450° lbs" 36° CID EPA
Odom: 52,211
HC CO CO 2 NOx MPG
EPA Test 1 .44 4.70 774 1.57 11.3
EPA Test 2 .48 3.00 781 1.58 12.7
Chry.Test .37 5.11 787 1.11
Vehicle 12 M 736 Plymouth Fury 450° lbs" 36° CID EPA
HC CO C02 NOx MPG
EPA Test 1 .45 1.91 883 1.14 10.0
EPA Test 2 .37 1.56 879 1.13 10.1
EPA Test 3 .38 1.14 874 1.08 10.1
EPA Test 4 .42 1.42 863 1.07 10.1
EPA Test 5 .45 1.88 870 1.12 10.1
EPA Test 6 .43 1.61 895 1.14 9.8
Chry. (not given)
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Ford 1975 Prototypes
Vehicle 22$58 Ford Maverick, 3500 Ibs., 250 CID
Odom: 7655 EGR/Thermactor/Ox. Cat.
HC CO C02 NOx MPG
EPA Test 1 .32 2.01 590 2.90 14.8
EPA Test 2 .32 2.51 588 2.04 14.8
EPA Test 3 .32 2.53 579 2.01 15.1
EPA Test 4 .32 2.17 570 1.99 15.3
EPA Test 5 .31 1.71 579 1.90 15.1
EPA Test 6 .33 2.13 574 2.03 15.3
EPA Test 7 .28 2.86 657 1.7.1 13.4
Ford Test 1 .24 .---• --- 1.67
Ford Test 2 .39 3.94 --- 1.84
Ford Test 3 .38 3.46 --- 1.87
Ford Test 4 .38 3.20 --- 2.12
Ford Test 5 .39 2.27 ---. 2.40
Vehicle 23 F 76 Ford F-100, 4500 Ibs., 360 CID ?
Odom: 8862
HC CO C02 NOx MPG
EPA Test 1 .23 1.92 816 2.37 10.8
EPA Test 2 .16 1.19 842 2.39 10.5
EPA Test 3 .19 .82 819 2.83 10.8
EPA Test 4 .22 2.05 822 2.69 10.7
EPA Test 5 .28 .71 817 2.53 10.9
EPA Test 6 .24 1.20 819 2.37 10.9
EPA Test 7 .20 1.64 864 2.58 10.3
EPA Test 8 .19 1.98 841 2.72 10.5
EPA Test 9 .48 1.61 844 2.86 10.5
Ford (not given)
Vehicle 2L33-D Lincoln, 5500 Ibs., 460 CID
Odom: 8,112 Thermactor/EGR/Ox. Conv.
HC CO C02 NOx MPG
EPA Test 1 .40 3.48 1020 3.70 8.6
EPA Test 2 .33 2.56 968 3.17 9.3
EPA Test 3 .28 2.59 999 3.20 8.9
Ford Test .47 2.28 --- 2.60
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AMC 1975 Prototypes
Vehicle 824-8D Gremlin, 3500 lbs.f 304 CID
Odom: 20,485 AC mini-conv.
HC CO C02 NOx MPG
EPA Test 1 .32 1.54 589 2.29 15.1
EPA Test 2 .32 1.59 598 2.40 14.8
EPA Test 3 .28 1.60 582 2.41 15.1
EPA Test 4 .31 1.41 599 2.36 14.8
AMC Test 1 .39 1.88 --- 2.24
AMC Test 2 .31 1.36 --- 2.07
AMC Test 3 .33 1.13 --- 2.17
AMC Test 4 .30 1.56 --- 2.07 ---
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