[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: 40CFR1048.230]



[Page 566-567]

 

                   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



[[Page 567]]



provisions, we may approve your request for separate treatment of sub-

families.



[70 FR 40473, July 13, 2005]