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Understanding Marine Propulsion Engine Types and Emissions

Learn about inboard, sterndrive, and outboard marine engines, fuel types, cooling systems, and emission regulations. Get insights on USCG requirements and how to keep your marine propulsion system efficient and eco-friendly.

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Understanding Marine Propulsion Engine Types and Emissions

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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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