Marine Propulsion EnginesMarine Propulsion Engines

EPA MeetingEPA Meeting02/14/0702/14/07

Marine Propulsion EnginesMarine Propulsion Engines• Three Primary TypesThree Primary Types

- - InboardInboard (Engine and Transmission (Engine and Transmission inside boat)inside boat)-- SterndriveSterndrive (Engine inside boat, (Engine inside boat, Transmission outside boat)Transmission outside boat)-- OutboardOutboard (Engine and (Engine and Transmission outside boat, hung Transmission outside boat, hung on stern)on stern)

Marine Propulsion EnginesMarine Propulsion EnginesInboard

Marine Propulsion EnginesMarine Propulsion EnginesSterndrive

Marine Propulsion EnginesMarine Propulsion EnginesOutboard

Marine Propulsion EnginesMarine Propulsion Engines• Two Primary FuelsTwo Primary Fuels

- - GasolineGasoline (Outboard, Inboard, (Outboard, Inboard, Sterndrive)Sterndrive)

-- DieselDiesel (Inboard, Sterndrive) (Inboard, Sterndrive)

Marine Propulsion EnginesMarine Propulsion Engines• USCG RequirementsUSCG Requirements

- - No exposed surface of the No exposed surface of the engine engine may have a surface may have a surface temperature temperature greater than 200 greater than 200 degrees Fdegrees F

• Requires Water Cooled ExhaustRequires Water Cooled Exhaust

Marine Propulsion EnginesMarine Propulsion Engines• Cooling SystemsCooling Systems

- - Raw Water CooledRaw Water Cooled (water from (water from lake/ocean is pumped through the lake/ocean is pumped through the engine, engine, mixed with the exhaust, and mixed with the exhaust, and discharges with discharges with the exhaust)the exhaust)

- - Closed Cooling Closed Cooling (water from (water from lake/ocean lake/ocean is pumped through a heat is pumped through a heat exchanger, exchanger, mixed with the exhaust, and mixed with the exhaust, and discharges with discharges with the exhaust)the exhaust)

Marine Propulsion EnginesMarine Propulsion EnginesCooling System

Marine Propulsion EnginesMarine Propulsion Engines• Exhaust EmissionsExhaust Emissions

- - Exhaust Emissions are almost Exhaust Emissions are almost entirely entirely gaseous emissionsgaseous emissions

-- Exhaust Emissions bubble out of the Exhaust Emissions bubble out of the water quickly (less than 30 seconds)water quickly (less than 30 seconds)

- - EPA and CARB regulate marine engineEPA and CARB regulate marine engineexhaust emissions as an air pollution exhaust emissions as an air pollution sourcesource

Marine Propulsion EnginesMarine Propulsion Engines

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