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the tests prescribed herein shall be calibrated from time to time in accordance with good technical practice. $ 1201.127 Test run.

(a) The temperature of the air supplied to the engine shall be between 68° F. and 86° F. The observed barometric pressure shall be between 28.5 inches and 31 inches Hg. Higher air temperature or lower barometric pressure may be used, if desired, but no allowance will be made for possible increased smoke emissions because of such conditions.

(b) The governor and fuel system shall have been adjusted to provide en gine performance at the levels specified by the engine manufacture: for maximum rated horsepower and maximum rated torque. These specifications shall be reported in accordance with $ 1201.51 (b) (3),

(c) The following steps shall be taken for each test:

(1) Start cooling system.

(2) Starting with a warmed engine, determine by experimentation the dynamometer inertia and dynamometer load required to perform the acceleration in the dynamometer cycle for smoke emission tests ($ 1201.122(a) (2)). In a manner appropriate for the dynamometer and controls being used, arrange to conduct the acceleration mode.

(3) Install smokemeter optical unit and connect it to the recorder. Connect the engine r.p.m. and torque sensing devices to the recorder.

(4) Turn on purge air to the optical unit of the smokemeter, if purge air is used.

(5) Check and record zero and span settings of the smokemeter recorder at a chart speed of approximately 1 inch per minute. (The optical unit shall be retracted from its position about the exhaust stream if the engine is left run. ning.)

(6) Precondition the engine by operating it for 10 minutes at maximum rated horsepower.

(7) Proceed with the sequence of smoke emission measurements on the engine dynamometer as prescribed in 3 1201.122.

(8) During the test sequence of $ 1201.122, continuously record smoke measurements, engine r.p.m. and torque at a chart speed of approximately 1 inch per minute minimum during the idle mode and transitional modes and 8 inches per

minute minimum during the acceleration and lugging modes.

(9) Turn off engine.

(10) Check zero and reset if necessary and check span of the smokemeter recorder by inserting neutral density filters. If either zero or span drift is in excess of 2 percent opacity, the test results shall be invalidated. $ 1201.128 Chart reading.

(a) The following procedure shall be employed in reading the smokemeter recorder chart.

(1) Locate the acceleration mode $ 1201.122(a) (2)) and the lugging mode (§ 1201.122 (a) (3)) on the Chart. Divide each mode into 42-second intervals beginning at the start of each mode Determine the average smoke reading during each 12-second interval except those recorded during the transitional portions of the acceleration mode ($ 1201.122(a) (2) (iii) and the lugging mode ($ 1201.122 (a) (3) (i)).

(2) Locate and record the 15 highest 1/2-second readings during the acceleration mode of each dynamometer cycle.

(3) Locate and record the five highest 12-second readings during the lugging mode of each dynamometer cycle. $ 1201.129 Calculations.

(a) Average the 45 readings in $ 1201.128(a) (2) and designate the value as "a".

(b) Average the 15 readings in $ 1201.128(a) (3) and designate the value as “b”. & 1201.130 Test engines.

(a) The engines covered by the application for certification will be divided into engine families based upon the criteria outlined in $ 1201.89(a).

(b) Emission data engines:

(1) Engines will be chosen to be run for emission data based upon engine family groupings. Within each engine family, the requirements of this paragraph must be met.

(2) Engines of each engine family will be divided into groups based upon exhaust emission control system. Two engines of each engine-system combination shall be run for smoke emission data as prescribed in $ 1201.132(b). Within each combination, the engines that feature the highest fuel feed per stroke, primarily at the speed of maximum rated torque and secondarily at rated speed, will be selected. In the case where more than one engine in an engine-system combination have the highest fuel feed per stroke, the engine with the highest maximum rated torque will be selected.

(c) Durability data engines:

(1) One engine from each engine system combination shall be tested for lifetime smoke emission data as prescribed in $ 1201.132(c). Within each combination, the engine which features the highest fuel feed per stroke, primarily at rated speed and secondarily at the speed of maximum rated torque, will be selected for durability testing. In the case where more than one engine in an engine-system combination has the highest fuel feed per stroke, the engine with the highest maximum rated horsepower will be selected for durability testing.

(2) A manufacturer may elect to operate and test additional engines to represent any engine-system combination. The additional engines must be of the same model and fuel system as the engine selected in accordance with the provisions of subparagraph (1) of this paragraph. Notice of an intent to test additional engines shall be given to the Secretary not later than 30 days following notification of the test fieet selection.

(d) Any manufacturer whose projected sales of new motor vehicle engines subject to this subpart for the model year for which certification is sought is less than 200 engines may request a reduction in the number of test engines determined in accordance with the foregoing provisions of this section. The Secretary may agree to such lesser number as he determines would meet the objectives of this procedure.

(e) In lieu of testing an emission data or durability data vehicles elected under paragraph (b) or (c) of this section and submitting data therefor, a manufacturer may, with the prior written approval of the Secretary, submit data on a similar vehicle for which certification has previously been obtained. $ 1201.131 Maintenance.

(a) (1) Maintenance on the engines and fuel systems of durability engines may be performed only under the following provisions:

(i) One major engine servicing to manufacturer's specifications may be performed at 500 hours (+8 hours) of dynamometer operation. A major engine servicing shall be restricted to the follow

(c) Adjust injector timing.
(d) Adjust governor.
(e) Clean and service injector tips.

(ii) Injectors may be changed if a persistent misfire is detected.

(iii) Normal engine lubrication services (engine oil change and oil filter, fuel filter, and air filter servicing and adjustment of drive belt tension, and engine bolt torque as required) will be allowed at manufacturer's recommended intervals.

(iv) Readjustment of the engine fuel rates may be performed only if there is a problem of dropping below 95 percent of maximum rated horsepower at 95-100 percent rated speed.

(v) Leaks in the fuel system, engine lubrication system and cooling system may be repaired.

(vi) Any other engine or fuel system maintenance or repairs will be allowed only with the advanced approval of the Secretary.

(2) Allowable maintenance on emission data engines shall be limited to the adjustment of engine low idle speed at the 125-hour test point.

(b) Complete emission tests (see $ $ 1201.121-1201.129) shall be run before and after any engine maintenance which may reasonably be expected to affect emissions. These test data shall be supplied to the Secretary immediately after the tests, along with a complete record of all pertinent maintenance, including an engineering report of any malfunction diagnosis and the corrective action taken, In addition, all test data and maintenance reports shall be compiled and provided to the Secretary in accordance with $ 1201.53.

(c) If the Secretary determines that maintenance or repairs performed have resulted in a substantial change to the engine-system combination, the engine shall not be used as a durability data engine. $ 1201.132 Service accumulation and

emission measurements. Service accumulation shall be accomplished by operation of an engine on a dynamometer.

(a) Emission data engines: Each engine shall be operated on a dynamometer for 125 hours with the dynamometer and engine adjusted so that the engine is operating at 95–100 percent of rated speed and at least 95 percent of maximum rated horsepower. During such operation, the engine shall be run at the

ing:

(a) Adjust low idle speed. (b) Adjust valve lash if required.

exhaust back pressure specified in $ 1201.123(c) and the air inlet restriction specified in $ 1201.123(d) except that the tolerances shall be +0.5 inches of Hg. and +3 inches of water respectively. Exhaust smoke tests shall be conducted at zero and 125 hours of operation.

(b) Durability data engines: Each engine shall be operated on a dynamometer for 1,000 hours with the dynamometer and engine adjusted so that the engine is operating at 95-100 percent of rated speed and at least 95 percent of maximum rated horsepower. During such operation the engine shall be run at the exhaust back pressure specified in $ 1201.123(c) and the air inlet restriction specified in $ 1201.123(d) except that the tolerances shall be +0.5 inches of Hg. and #3 inches of water respectively. Exhaust smoke measurements shall be made at zero hours and at each 125 hours of operation. All results except the zero hour results shall be used to establish the deterioration factors (see $ 1201.133).

(c) All tests required by this subpart to be conducted after 125 hours of dynamometer operation or at any multiple of 125 hours may be conducted at any accumulated hours within 8 hours of 125 hours or the appropriate multiple of 125 hours, respectively.

(d) The results of each emission test shall be supplied to the Secretary immediately after the test. In addition, all test data shall be compiled and provided to the Secretary in accordance with $ 1201.53.

(e) Whenever the manufacturer proposes to operate and test an engine which may be used for emission or durability data, he shall provide the zero hour test data to the Secretary and make the engine available for such testing under $ 1201.54 as the Secretary may require before beginning to accumulate hours on the engine. Failure to comply with this requirement shall invalidate all test data submitted for this engine.

(f) Once a manufacturer begins to operate an emission data or durability data engine, as indicated by compliance with paragraph (e) of this section, he shall continue to run the engine to 125 hours or 1,000 hours, respectively, and the data from the engine shall be used in the calculations under $ 1201.133. Discontinuation of an engine shall be allowed only with the prior written consent of the Secretary.

$ 1201.133 Compliance with emission

standards. (a) The emission standards in the regulations in this part apply to the lifetime emission of engines in public use. Prior to certification, lifetime emissions can be obtained by projection of test data to lifetime normal service. Lifetime normal service or its equivalent is taken to be 2,000 hours of prescribed dynamometer operation.

(b) It is expected that the opacity of exhaust emissions will change with use of the engine. It is assumed that the emission level corresponding to 1,000 hours of prescribed dynamometer operation is the average emission of an engine over its lifetime.

(c) The procedure for determining compliance with exhaust smoke emission standards in heavy duty diesel engines is as follows:

(1) Emission deterioration factors for the acceleration mode (designated as "A") and the lugging mode (designated as “B”) shall be established separately for each engine-system combination.

(i) The applicable results to be used in determining the deterioration factors for each combination shall be:

(a) All emission data from the tests required under $ 1201.132(b), except the zero hour tests. This shall include the official test results, as determined in $ 1201.54, for all tests conducted on all durability engines of the combination selected under $ 1201.130(c) (including all engines elected to be operated by the manufacturer under $ 1201.130(c) (2)).

(b) All emission data from the tests conducted before and after the maintenance provided in § 1201.131(a) (1) (i).

(ii) All applicable results shall be plotted as a function of the hours on the system, rounded to the nearest hour, and the best fit straight lines, fitted by the method of least squares, shall be drawn through these data points. The interpolated 125 and 1,000 hour points on this line must be within the standard provided in § 1201.41 or the data shall not be used in calculation of a deterioration factor.

(iii) The deterioration factors will be calculated as follows: A-percent opacity "a", interpolated to. hours, minus percent opacity "a," inter

polated to 125 hours. B-percent opacity "b", interpolated to 1,000 hours, minus percent opacity "b", interpolated to 125 hours.

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(2) The “percent opacity" values to

APPENDIX A-Continued compare with the standards shall be the Time Speed | Time Speed Time Speed opacity values "a" and "b" for each emis

(sec.) (m.p.h.) (sec.) (m.p.h.) | (sec.) (m.p.k.)
16.0
127 0.0

211 47.0 sion data engine within an engine-system

17.1

128 0.0 212 47.0 combination to which are added the re 45 19.1 129 0.0

213 47.0 spective factors “A” and “B” of subpara 46 21.1 130 0.0

214 47.2 graph (1) of this paragraph for that 47 22.7 131 0.0

215 47.4 engine-system

48 combination: Provided,

0.0 22.9 132

216 47.9 133 49 22.7

0.0

217 48.5 That if a deterioration factor as com

50 22.6

134 0.0 218 49.1 puted in subparagraph (1) of this para

51 21.3
135 0.0

219 49.5 graph is less than zero, that deterioration

52 19.0
136 0.0

220 50.0 factor shall be zero for the purposes of 53 17.1

137
0.0

221 50.6 this subparagraph.

54 15.8
138 0.0

222 51.0
55 15.8
139 0.0

223 51.5 (3) Every test engine of an engine

56 17.7
140 0.0

224 52.2 family must comply with all applicable

57 19.8 141 0.0

225 53.2 standards, as determined in subpara 58 21.6

142
0.0

226 54.1 graph (2) of this paragraph, before any 59 23.2 143 0.0 227 54.6

144 60 24.2

0.0

228 engine in that family will be certified.

54.9 61 24.6 145 0.0

229 55.0 APPENDIX A

62 24.9
146 0.0

230 54.9 63 25.0

147
0.0

231 54.6 DHEW URBAN DYNAMOMETER DRIVING SCHEDULE

64 24.6 148

232 54.6 (Speed versus Time Sequence)

65 24.5 149 0.0 233 54.8 Time Speed Time Speed

66

0.0
Time Speed
24.7 150

234 55.1 (sec.) (m.p.h.) (sec.) (m.p.h.) (sec.) (m.p.h.)

67 24.8

151 0.0 235 55.5 0.0 84 28.6 168 16.5 68 24.7 152 0.0

236 55.7 0.0 85 29.3 169 19.8

69 24.6 153 0.0

237 56.1 0.0 86 29.8 170 22.2

70 24.6 154 0.0 238 56.3 0.0 87 30.1 171 24.3 71 25.1 155 0.0

239 56.6 0.0 88 30.4 172 25.8

72 25.6 156

0.0

240 56.7 89 30.7 173 26.4

73 25.7 157

0.0

241 56.7 0.0 90 30.7 174 25.7

74 25.4 158

0.0

242 56.5 0.0 91 30.5 175 25.1

75 24.9 159 0.0 243 56.5 92 30.4 176 24.7

76 25.0 160 0.0 244 56.5 90.0 93 30.3 177 25.0

77 25.4 161 0.0 245 56.5 0.0 94 30.4 178 25.2

78 26.0

162 0.0 246 56.5 11 0.0 95 30.8 179 25.4

79 26.0 163 0.0 247 56.5 12 0.0 96 30.4 180 25.8

80 25.7 164 3.3

248 56.4 13 0.0 97 29.9 181 27.2

81 26.1 165 6.6

249 56.1 0.0 98 29.5 182 26.5

82 26.7 166 9.9 250 55.8 15 0.0 99 29.8 183 24.0

83 27.5
167 13.2

251 55.1 16 0.0 100 30.3 184 22.7

252 54.6 339 0.0 426 8.5 17 0.0 101 30.7 185 19.4

253 54.2 340 0.0 427 5.2 0.0 102 30.9 186 17.7

254 54.0 341 0.0 428 1.9 0.0 103 31.0 187 17.2

255 53.7 342 0.0

429 0.0 20 0.0 104 30.9 188 18.1

256 53.6
343 0.0

430 0.0
3.0
105 30.4 189 18.6

257 53.9 344

431 22 5.9 106 29.8 190 20.0

258 54.0 345 0.0 432 0.0 23 8.6 107 29.9

191 22.2
259 54.1 346

433 24 11.5 108 30.2 192 24.5

260 54.1 347 1.0 434 25 14.3 109 30.7 193 27.3

261 53.8

348 4.3 435 26 16.9 110 31.2 194 30.5

262 53.4 349 7.6

436 0.0 27 17.3 111 31.8 195 33.5

263 53.0 350 10.9

437 28 18.1 112 32.2 196 36.2

264 52.6

351 14.2 438 29 20.7 113 32.4 197 37.3

265 52.1

352 17.3 439 0.0 30 21.7 114 32.2 198 39.3

266 52.4 353 20.0 440 0.0 31 22.4 115 31.7

199 40.5

267 52.0 354 22.5 441 0.0 22.5 116 28.6 200 42.1

268 51.9 355 23.7 442 0.0 33 22.1 117 25.3

201 43.5

269 51.7

356 25.2 443 0.0 34 21.5 118 22.0

202 45.1

270 51.5

357 26.6 444 0.0 35 20.9 119 18.7 203 46.0

271 51.6
358 28.1

0.0 36 20.4 120 15.4 204 46.8

272 51.8

359 30.0 446 0.0 37 19.8 121 12.1 205 47.5 273 52.1 360 30.8

447 0.0 38 17.0 122 8.8 206 47.5

274 52.5 361 31.6 39 14.9 123 207 47.3

275 53.0 362 32.1 449 6.6 40 14.9 124 2.2 208 47.2

276 53.5 363 32.8 450 9.9 41 15.2 125 0.0 209 47.0

277 54.0 364 33.6 451 13.2 42 15.5 126 0.0 210 47.0

278 54.9
365 34.5

452 16.5

0.0

14

19

21

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