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Overview of Marine Propulsion Engines: Types, Fuels, Cooling Systems, and Emissions Standards

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This document provides a comprehensive overview of marine propulsion engines, detailing the three primary types: inboard, sterndrive, and outboard. It discusses the two main fuel options—gasoline and diesel—and highlights U.S. Coast Guard requirements, including the necessity for water-cooled exhaust systems. The cooling systems are explained, covering both raw water and closed cooling methods. Finally, the document addresses exhaust emissions, emphasizing their regulation by the EPA and CARB as sources of air pollution, and the quick dissipation of emissions into the water.

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Overview of Marine Propulsion Engines: Types, Fuels, Cooling Systems, and Emissions Standards

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  1. Marine Propulsion Engines EPA Meeting 02/14/07

  2. Marine Propulsion Engines • Three Primary Types - Inboard (Engine and Transmission inside boat) - Sterndrive (Engine inside boat, Transmission outside boat) - Outboard (Engine and Transmission outside boat, hung on stern)

  3. Marine Propulsion Engines Inboard

  4. Marine Propulsion Engines Sterndrive

  5. Marine Propulsion Engines Outboard

  6. Marine Propulsion Engines • Two Primary Fuels - Gasoline (Outboard, Inboard, Sterndrive) - Diesel (Inboard, Sterndrive)

  7. Marine Propulsion Engines • USCG Requirements - No exposed surface of the engine may have a surface temperature greater than 200 degrees F • Requires Water Cooled Exhaust

  8. Marine Propulsion Engines • Cooling Systems - Raw Water Cooled (water from lake/ocean is pumped through the engine, mixed with the exhaust, and discharges with the exhaust) - Closed Cooling (water from lake/ocean is pumped through a heat exchanger, mixed with the exhaust, and discharges with the exhaust)

  9. Marine Propulsion Engines Cooling System

  10. Marine Propulsion Engines • Exhaust Emissions - Exhaust Emissions are almost entirely gaseous emissions - Exhaust Emissions bubble out of the water quickly (less than 30 seconds) - EPA and CARB regulate marine engine exhaust emissions as an air pollution source

  11. Marine Propulsion Engines Questions????

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