[Code of Federal Regulations]
[Title 40, Volume 17]
[Revised as of July 1, 2003]
From the U.S. Government Printing Office via GPO Access
[CITE: 40CFR86.884-12]

[Page 69-70]
 
                   TITLE 40--PROTECTION OF ENVIRONMENT
 
         CHAPTER I--ENVIRONMENTAL PROTECTION AGENCY (CONTINUED)
 
PART 86--CONTROL OF EMISSIONS FROM NEW AND IN-USE HIGHWAY VEHICLES AND 
ENGINES (CONTINUED)--Table of Contents
 
Subpart I--Emission Regulations for New Diesel Heavy-Duty Engines; Smoke 
                         Exhaust Test Procedure
 
Sec. 86.884-12  Test run.

    (a) The temperature of the air supplied to the engine shall be 
between 68  deg.F and 86  deg.F. The engine fuel inlet temperature shall 
be 100  deg.F 10  deg.F and shall be measured at a point 
specified by the manufacturer. The observed barometric pressure shall be 
between 28.5 inches and 31 inches Hg. Higher air temperature or lower 
barometric pressure may be used, if desired, but no allowance will be 
made for possible increased smoke emissions because of such conditions.
    (b) The governor and fuel system shall have been adjusted to provide 
engine performance at the levels in the application for certification 
required under Sec. 86.084-21.
    (c) The following steps shall be taken for each test:
    (1) Start cooling system;
    (2) Warm up the engine by the procedure described in Sec. 86.1332-
84(d)(3) (i) through (v).
    (3) Determine by experimentation the dynamometer inertia and 
dynamometer load required to perform the acceleration in the dynamometer 
cycle for smoke emission tests (Sec. 86.884-7(a)(2)). In a manner 
appropriate for the dynamometer and controls being used, arrange to 
conduct the acceleration mode;
    (4) Install smokemeter optical unit and connect it to the recorder/
data collection system. Connect the engine rpm and throttle position 
sensing devices to the recorder/data collection system;
    (5) Turn on purge air to the optical unit of the smokemeter, if 
purge air is used;
    (6) Check and record zero and span settings of the smokemeter. (If a 
recorder is used, a chart speed of approximately one inch per minute 
shall be used.) The optical unit shall be retracted from its position 
about the exhaust stream if the engine is left running;
    (7) Precondition the engine by operating it for 10 minutes at 
maximum rated horsepower;
    (8) Proceed with the sequence of smoke emission measurements on the 
engine dynamometer as prescribed in Sec. 86.884-7;
    (9)(i) During the test sequence of Sec. 86.884-7, continuously 
record smoke measurements, engine rpm, and throttle position.
    (ii) If a chart recorder is used for data collection, it shall be 
run at a minimum chart speed of one inch per minute during the idle mode 
and transitional periods, and eight inches per minute during the 
acceleration and lugging modes.
    (iii) Automatic data collection equipment, if used, shall sample at 
least two records per second.
    (iv) The smoke meter zero and full scale response may be rechecked 
and reset during the idle mode of each test sequence.
    (v) If either zero or full-scale drift is in excess of 2 percent 
opacity, the smokemeter controls must be readjusted and the test must be 
repeated;

[[Page 70]]

    (10) Turn off engine;
    (11)(i) Check zero and reset if necessary.
    (ii) Check span response (linearity) of the smokemeter by inserting 
neutral density filters.
    (iii) If either zero drift or the linearity check is in excess of 
two percent opacity, the results shall be invalidated.

[48 FR 52203, Nov. 16, 1983, as amended at 49 FR 48141, Dec. 10, 1984; 
52 FR 47870, Dec. 16, 1987]