{"data":{"id":"us/40-cfr-appendix-ii-to-part-1045","jurisdiction":"us","citation":"40 CFR Appendix II to Part 1045","heading":"Appendix II to Part 1045—Duty Cycles for Propulsion Marine Engines","body":"(a) The following duty cycle applies for discrete-mode testing:\nE4 Mode No. Engine speed 1 Torque (percent) 2 Weighting factors\n1 Maximum test speed 100 0.06\n2 80% 71.6 0.14\n3 60% 46.5 0.15\n4 40% 25.3 0.25\n5 Warm idle 0 0.40\n1 Speed terms are defined in 40 CFR part 1065. Percent speed values are relative to maximum test speed.\n2 Except as noted in § 1045.505, the percent torque is relative to maximum torque at maximum test speed.\n(b) The following duty cycle applies for ramped-modal testing:\nRMC Mode Time in mode (seconds) Engine speed 1 2 Torque (percent) 2 3\n1a Steady-state 225 Idle 0\n1b Transition 20 Linear transition Linear transition\n2a Steady-state 63 Maximum test speed 100\n2b Transition 20 Linear transition Linear transition\n*3a Steady-state 271 40% 25.3%\n3b Transition 20 Linear transition Linear transition\n4a Steady-state 151 80% 71.6%\n4b Transition 20 Linear transition Linear transition\n5a Steady-state 161 60% 46.5%\n5b Transition 20 Linear transition Linear transition\n6 Steady-state 229 Warm idle 0\n1 Speed terms are defined in 40 CFR part 1065. Percent speed values are relative to maximum test speed.\n2 Advance from one mode to the next within a 20-second transition phase. During the transition phase, command linear progressions of speed and torque from the speed setting and torque setting of the current mode to the speed setting and torque setting of the next mode.\n3 Except as noted in § 1045.505, the percent torque is relative to maximum torque at maximum test speed.","path":["Title 40—Protection of Environment","CHAPTER I—ENVIRONMENTAL PROTECTION AGENCY","SUBCHAPTER U—AIR POLLUTION CONTROLS","PART 1045—CONTROL OF EMISSIONS FROM SPARK-IGNITION PROPULSION MARINE ENGINES AND VESSELS"],"source_url":"https://www.ecfr.gov/api/versioner/v1/full/2026-08-25/title-40.xml","current_through":"2026-08-25","vintage":"","retrieved_at":"2026-08-27T02:26:04Z","sha256":"87b0cdd0db38c465f70fa683a64524d6ecc983f819463f307ef8e9879f018aca","source_id":"us-cfr","stale":true,"prev":"us/40-cfr-appendix-i-to-part-1045","next":"us/40-cfr-1048.1"},"notice":"GroundRules: Original legal text. Not legal advice."}