(a) Overview. For the purpose of determining compliance with the emission standards of Sec. 94.8, except for those in Sec. 94.8(e), engines shall be tested using the appropriate duty cycles described in this section.
(b) General cycle. Propulsion engines that are used with (or intended to be used with) fixed-pitch propellers, propeller-law auxiliary engines, and any other engines for which the other duty cycles of this section do not apply, shall be tested using the duty cycle described in the following Table B-1:
Table B-1--General Marine Duty Cycle----------------------------------------------------------------------------------------------------------------
Engine
speed \1\ Percent of Minimum
Mode No. (percent of maximum time in Weighting
maximum test power mode factors
test speed) \2\ (minutes)----------------------------------------------------------------------------------------------------------------1........................................................... 100 100 5.0 0.202........................................................... 91 75 5.0 0.503........................................................... 80 50 5.0 0.154........................................................... 63 25 5.0 0.15----------------------------------------------------------------------------------------------------------------\1\ Engine speed: [2 percent of point.\2\ Power: [2 percent of engine maximum value.
(c) Variable-pitch and electrically coupled propellers. (1) Constant-speed propulsion engines that are used with (or intended to be used with) variable-pitch propellers or with electrically coupled propellers shall be tested using the duty cycle described in the following Table B-2:
Table B-2--Duty Cycle for Constant-Speed Propulsion Engines----------------------------------------------------------------------------------------------------------------
Engine
speed \1\ Percent of Minimum
Mode No. (percent of maximum time in Weighting
maximum test power mode factors
test speed) \2\ (minutes)----------------------------------------------------------------------------------------------------------------1........................................................... 100 100 5.0 0.202........................................................... 100 75 5.0 0.503........................................................... 100 50 5.0 0.154........................................................... 100 25 5.0 0.15----------------------------------------------------------------------------------------------------------------\1\ Engine speed: [2 percent of point.\2\ Power: [2 percent of engine maximum value.
(2) For the purpose of determining compliance with the emission standards of Sec. 94.8, variable-speed propulsion engines that are used with (or intended to be used with) variable-pitch propellers or with electrically coupled propellers shall be tested using the duty cycle described in Table B-3, which follows:
Table B-3--Duty Cycle for Variable Speed Propulsion Engines Used on Non-Propeller Law Vessels and for Variable
Speed Auxiliary Engines----------------------------------------------------------------------------------------------------------------
Percent of Minimum
maximum time in Weighting
Test segment Mode No. Engine speed \1\ test torque mode factors
\2\ (minutes)----------------------------------------------------------------------------------------------------------------1......................... 1 Maximum Test Speed.............. 100 5.0 0.151......................... 2 Maximum Test Speed.............. 75 5.0 0.151......................... 3 Maximum Test Speed.............. 50 5.0 0.151......................... 4 Maximum Test Speed.............. 10 5.0 0.102......................... 5 Intermediate.................... 100 5.0 0.102......................... 6 Intermediate.................... 75 5.0 0.102......................... 7 Intermediate.................... 50 5.0 0.102......................... 8 Idle............................ 0 5.0 0.15----------------------------------------------------------------------------------------------------------------\1\ Engine speed (non-idle): [2 percent of point. Engine speed (idle): Within manufacturer's specifications.
Idle speed is specified by the manufacturer.\2\ Torque (non-idle): [2 percent of engine maximum value. Torque (idle): minimum fueling rate Load less than 5
percent of peak torque.
(d) Auxiliary. For the purpose of determining compliance with the emission standards of Sec. 94.8:
(1) Constant speed auxiliary engines shall be tested using the duty cycle described in Table B-4, which follows:
Table B-4--Duty Cycle for Constant-Speed Auxiliary Engines----------------------------------------------------------------------------------------------------------------
Percent of Minimum
maximum time in Weighting
Mode No. Engine speed \1\ test torque mode factors
\2\ (minutes)----------------------------------------------------------------------------------------------------------------1....................................... Maximum Test Speed............. 100 5.0 0.052....................................... Maximum Test Speed............. 75 5.0 0.253....................................... Maximum Test Speed............. 50 5.0 0.304....................................... Maximum Test Speed............. 25 5.0 0.305....................................... Maximum Test Speed............. 10 5.0 0.10----------------------------------------------------------------------------------------------------------------\1\ Engine speed: [2 percent of point.\2\ Torque: [2 percent of engine maximum value.
(2) Variable speed auxiliary engines shall be tested using the duty cycle described in Table B-3 in paragraph (c)(2) of this section.
(e) Recreational. For the purpose of determining compliance with the emission standards of Sec. 94.8, recreational engines shall be tested using the duty cycle described in Table B-5, which follows:
Table B-5--Recreational Marine Duty Cycle----------------------------------------------------------------------------------------------------------------
Engine
speed\(1)\ Percent of Minimum time
Mode No. (percent of maximum test in mode Weighting
maximum test power\(2)\ (minutes) factors
speed)----------------------------------------------------------------------------------------------------------------1............................................... 100 100 5.0 0.082............................................... 91 75 5.0 0.133............................................... 80 50 5.0 0.174............................................... 63 25 5.0 0.325............................................... idle 0 5.0 0.30----------------------------------------------------------------------------------------------------------------\1\ Engine speed: [2 percent of point.\2\ Power: [2 percent of engine maximum value. [64 FR 73331, Dec. 29, 1999, as amended at 67 FR 68343, Nov. 8, 2002; 70 FR 40458, July 13, 2005]