[Code of Federal Regulations]

[Title 40, Volume 20]

[Revised as of July 1, 2006]

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

[CITE: 40CFR89.116]



[Page 59]

 

                   TITLE 40--PROTECTION OF ENVIRONMENT

 

         CHAPTER I--ENVIRONMENTAL PROTECTION AGENCY (CONTINUED)

 

PART 89_CONTROL OF EMISSIONS FROM NEW AND IN-USE NONROAD 

COMPRESSION-IGNITION ENGINES--Table of Contents

 

        Subpart B_Emission Standards and Certification Provisions

 

Sec.  89.116  Engine families.



    (a) A manufacturer's product line is divided into engine families 

that are comprised of engines expected to have similar emission 

characteristics throughout their useful life periods.

    (b) The following characteristics distinguish engine families:

    (1) Fuel;

    (2) Cooling medium;

    (3) Method of air aspiration;

    (4) Method of exhaust aftertreatment (for example, catalytic 

converter or particulate trap);

    (5) Combustion chamber design;

    (6) Bore;

    (7) Stroke;

    (8) Number of cylinders, (engines with aftertreatment devices only); 

and

    (9) Cylinder arrangement (engines with aftertreatment devices only).

    (c) Upon a showing by the manufacturer that the useful life period 

emission characteristics are expected to be similar, engines differing 

in one or more of the characteristics in paragraph (b) of this section 

may be grouped in the same engine family.

    (d) Upon a showing by the manufacturer that the expected useful life 

period emission characteristics will be different, engines identical in 

all the characteristics of paragraph (b) of this section may be divided 

into separate engine families.

    (e)(1) This paragraph (e) applies only to the placement of Tier 1 

engines with power ratings under 37 kW into engine families. The 

provisions of paragraphs (a) through (d) of this section also apply to 

these engines. The power categories referred to in this paragraph (e) 

are those for which separate standards or implementation dates are 

described in Sec.  89.112.

    (2) A manufacturer may place engines with power ratings in one power 

category into an engine family comprised of engines with power ratings 

in another power category, and consider all engines in the engine family 

as being in the latter power category for the purpose of determining 

compliance with the standards and other requirements of this part, 

subject to approval in advance by the Administrator and the following 

restrictions:

    (i) The engines that have power ratings outside the engine family's 

power category must constitute less than half of the engine family's 

sales in each model year for which the engine family grouping is made; 

and

    (ii) The engines that have power ratings outside the engine family's 

power category must have power ratings that are within ten percent of 

either of the two power levels that define the engine family's power 

category.

    (3) The restrictions described in paragraphs (e)(2)(i) and 

(e)(2)(ii) of this section do not apply if the emissions standards and 

other requirements of this part are at least as stringent for the engine 

family's power category as those of the other power categories 

containing engines in the engine family.



[59 FR 31335, June 17, 1994. Redesignated and amended at 63 FR 56995, 

57003, Oct. 23, 1998]