Marine Propulsion EnginesMarine Propulsion Engines

EPA MeetingEPA Meeting

02/14/0702/14/07

Marine Propulsion EnginesMarine Propulsion Engines

• Three Primary TypesThree Primary Types- - InboardInboard (Engine and (Engine and

Transmission 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, Transmission outside boat, hung 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 lake/ocean is pumped through the the engine, mixed with the exhaust, engine, mixed with the exhaust, and and discharges with the exhaust)discharges with the exhaust)

- - Closed Cooling Closed Cooling (water from (water from lake/ocean is pumped through a heat lake/ocean is pumped through a heat

exchanger, mixed with the exchanger, mixed with the exhaust, and exhaust, and discharges with the discharges with the exhaust)exhaust)

Marine Propulsion EnginesMarine Propulsion EnginesCooling System

Marine Propulsion EnginesMarine Propulsion Engines

• Exhaust EmissionsExhaust Emissions- - Exhaust Emissions are almost Exhaust Emissions are almost

entirely gaseous emissionsentirely gaseous emissions

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

seconds)seconds)

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

Marine Propulsion EnginesMarine Propulsion Engines

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