Marine Propulsion Engines

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Marine Propulsion Engines

• EPA Meeting
• 02/14/07

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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)

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Marine Propulsion Engines
Inboard
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Marine Propulsion Engines
Sterndrive
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Marine Propulsion Engines
Outboard
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Marine Propulsion Engines

• Two Primary Fuels
• - Gasoline (Outboard, Inboard, Sterndrive)
• - Diesel (Inboard, Sterndrive)

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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

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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)

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Marine Propulsion Engines
Cooling System
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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

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Marine Propulsion Engines

• Questions????