[Code of Federal Regulations]

[Title 40, Volume 31]

[Revised as of July 1, 2006]

From the U.S. Government Printing Office via GPO Access

[CITE: 40CFR1048.501]



[Page 577-578]

 

                   TITLE 40--PROTECTION OF ENVIRONMENT

 

         CHAPTER I--ENVIRONMENTAL PROTECTION AGENCY (CONTINUED)

 

PART 1048_CONTROL OF EMISSIONS FROM NEW, LARGE NONROAD SPARK-IGNITION 

ENGINES--Table of Contents

 

                        Subpart F_Test Procedures

 

Sec.  1048.501  How do I run a valid emission test?





    (a) Use the equipment and procedures for spark-ignition engines in 

40 CFR part 1065 to determine whether engines meet the duty-cycle 

emission standards in Sec.  1048.101(a) and (b). Measure the emissions 

of all the pollutants we regulate in Sec.  1048.101 using the sampling 

procedures specified in 40 CFR part 1065. Use the applicable duty cycles 

specified in Sec. Sec.  1048.505 and 1048.510.

    (b) Section 1048.515 describes the supplemental procedures for 

evaluating whether engines meet the field-testing emission standards in 

Sec.  1048.101(c).



[[Page 578]]



    (c) Use the fuels specified in 40 CFR part 1065, subpart C, to 

perform valid tests for all the testing we require in this part, except 

as noted in Sec.  1048.515. For service accumulation, use the test fuel 

or any commercially available fuel that is representative of the fuel 

that in-use engines will use.

    (d) In place of the provisions of 40 CFR 1065.405, you may consider 

emission levels stable without measurement after 50 hours of engine 

operation.

    (e) To test engines for evaporative emissions, use the equipment and 

procedures specified for testing diurnal emissions in 40 CFR 86.107-96 

and 86.133-96 with fuel meeting the specifications in 40 CFR part 1065, 

subpart C. Measure emissions from a test engine with a complete fuel 

system. Reported emission levels must be based on the highest emissions 

from three successive 24-hour periods of cycling temperatures. Note that 

you may omit testing for evaporative emissions during certification if 

you certify by design, as specified in Sec.  1048.245.

    (f) You may use special or alternate procedures to the extent we 

allow them under 40 CFR 1065.10.

    (g) This subpart is addressed to you as a manufacturer, but it 

applies equally to anyone who does testing for you, and to us when we 

perform testing to determine if your engines meet emission standards.

    (h) Map all engines (including constant-speed engines) using the 

procedures specified in 40 CFR part 1065 for variable-speed engines. For 

constant-speed engines, continue the mapping procedure until you reach 

the high-idle speed (the highest speed at which the engine produces zero 

torque).



[70 FR 40476, July 13, 2005]