[Code of Federal Regulations]
[Title 40, Volume 30]
[Revised as of July 1, 2004]
From the U.S. Government Printing Office via GPO Access
[CITE: 40CFR1039.510]

[Page 502]
 
                   TITLE 40--PROTECTION OF ENVIRONMENT
 
         CHAPTER I--ENVIRONMENTAL PROTECTION AGENCY (CONTINUED)
 
PART 1039_CONTROL OF EMISSIONS FROM NEW AND IN-USE NONROAD 
COMPRESSION-IGNITION ENGINES--Table of Contents
 
                        Subpart F_Test Procedures
 
Sec. 1039.510  Which duty cycles do I use for transient testing?

    (a) Measure emissions by testing the engine on a dynamometer with 
one of the following transient duty cycles to determine whether it meets 
the transient emission standards in Sec. 1039.101(a):
    (1) For variable-speed engines, use the transient duty cycle 
described in Appendix VI of this part.
    (2) [Reserved]
    (b) The transient test sequence consists of an initial run through 
the transient duty cycle from a cold start, 20 minutes with no engine 
operation, then a final run through the same transient duty cycle. Start 
sampling emissions immediately after you start the engine. Calculate the 
official transient emission result from the following equation:

Official transient emission result = 0.05 x cold-start emission rate + 
0.95 x hot-start emission rate.

    (c) Cool the engine down between tests as described in 40 CFR 
86.1335-90.
    (d) For validating cycle statistics, you may delete from your 
regression analysis speed, torque, and power points for the first 23 
seconds and the last 25 seconds of the transient duty cycle.