[Code of Federal Regulations]
[Title 40, Volume 31]
[Revised as of July 1, 2007]
From the U.S. Government Printing Office via GPO Access
[CITE: 40CFR1048.501]

[Page 578-579]
 
                   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).
    (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

[[Page 579]]

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]