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 Code of Federal Regulations (Last Updated: November 8, 2024)
 Title 40 - Protection of Environment
 Chapter I - Environmental Protection Agency
 SubChapter C - Air Programs
 Part 89 - Control of Emissions from New and in-Use Nonroad Compression-Ignition Engines
 Subpart E - Exhaust Emission Test Procedures

  Appendix B to Subpart E of Part 89 - Tables  

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  • Appendix B to Subpart E of Part 89 - Tables

    Table 1 - 8-Mode Test Cycle for Variable-Speed Engines

    Test segment Mode number Engine speed1 Observed torque2 (percent of max. observed) Minimum time in mode (minutes) Weighting factors
    1 1 Rated 100 5.0 0.15
    1 2 Rated 75 5.0 0.15
    1 3 Rated 50 5.0 0.15
    1 4 Rated 10 5.0 0.10
    2 5 Int 100 5.0 0.10
    2 6 Int 75 5.0 0.10
    2 7 Int 50 5.0 0.10
    2 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): Throttle fully open for 100 percent points. Other non-idle points: ±2 percent of engine maximum value. Torque (idle): Throttle fully closed. Load less than 5 percent of peak torque.

    Table 2 - 5-Mode Test Cycle for Constant-Speed Engines

    Mode number Engine1 Speed Observed torque2 (percent of max. observed) Minimum time in mode (minutes) Weighting factors
    1 Rated 100 5.0 0.05
    2 Rated 75 5.0 0.25
    3 Rated 50 5.0 0.30
    4 Rated 25 5.0 0.30
    5 Rated 10 5.0 0.10

    1 Engine speed: ±2 percent of point.

    2 Torque: Throttle fully open for 100 percent point. Other points: ±2 percent of engine maximum value.

    Table 3 - 6-Mode Test Cycle for Engines Rated Under 19 kW

    Mode number Engine speed1 Observed torque2 (percent of max. observed) Minimum time in mode (minutes) Weighting factors
    1 Rated 100 5.0 0.09
    2 Rated 75 5.0 0.20
    3 Rated 50 5.0 0.29
    4 Rated 25 5.0 0.30
    5 Rated 10 5.0 0.07
    6 Idle 0 5.0 0.05

    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): Throttle fully open for operation at 100 percent point. Other nonidle points: ±2 percent of engine maximum value. Torque (idle): Throttle fully closed. Load less than 5 percent of peak torque.

    Table 4 - 4-Mode Test Cycle for Propulsion Marine Diesel Engines

    Mode number Engine speed1 (percent of max. observed) Observed power2 (percent of max. observed) Minimum time in mode (minutes) Weighting factors
    1 100 100 5.0 0.20
    2 91 75 5.0 0.50
    3 80 50 5.0 0.15
    4 63 25 5.0 0.15

    1 Engine speed: ±2 percent of point.

    2 Power: Throttle fully open for operation at 100 percent point. Other points: ±2 percent of engine maximum value.

    [63 FR 57019, Oct. 23, 1998]