[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: 40CFR1048.230]

[Page 567]
 
                   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 C_Certifying Engine Families
 
Sec.  1048.230  How do I select engine families?

    (a) Divide your product line into families of engines that are 
expected to have similar emission characteristics throughout the useful 
life. Your engine family is limited to a single model year.
    (b) Group engines in the same engine family if they are the same in 
all of the following aspects:
    (1) The combustion cycle.
    (2) The cooling system (water-cooled vs. air-cooled).
    (3) Configuration of the fuel system (for example, fuel injection 
vs. carburetion).
    (4) Method of air aspiration.
    (5) The number, location, volume, and composition of catalytic 
converters.
    (6) The number, arrangement, and approximate bore diameter of 
cylinders.
    (7) Evaporative emission controls.
    (c) You may subdivide a group of engines that is identical under 
paragraph (b) of this section into different engine families if you show 
the expected emission characteristics are different during the useful 
life.
    (d) You may group engines that are not identical with respect to the 
things listed in paragraph (b) of this section in the same engine family 
if you show that their emission characteristics during the useful life 
will be similar.
    (e) You may create separate families for exhaust emissions and 
evaporative emissions. If we do this, list both families on the emission 
control information label.
    (f) Where necessary, you may divide an engine family into sub-
families to meet different emission standards, as specified in Sec.  
1048.101(a)(2). For issues related to compliance and prohibited actions, 
we will generally apply decisions to the whole engine family. For engine 
labels and other administrative provisions, we may approve your request 
for separate treatment of sub-families.

[70 FR 40473, July 13, 2005]