The BMW M56 is a 2.5 liter 184 PS (135 kW; 181 bhp) straight-six engine. This is a reengineered version of the BMW M54B25 engine, manufactured to meet SULEV regulations in 4 US states.
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The updated 2.5-liter engine, named the M56B25, was produced between 2002 and 2005. It was BMW's first Super Low Emission Super (SULEV) vehicle.
The power output and performance of the M56B25 vehicle is the same as the comparable model that comes with the M54B25 engine (US only). The above mentioned SU5V M56 models are sold in California, New York and Massachusetts as models in 2003 and in Vermont starting in 2004.
In addition, the vehicle is certified as a partial zero-emission vehicle (PZEV): The vehicle meets SULEV exhaust emission standards, which are approximately 1/5 of the ULEV standard. The vehicle meets the requirements of Zero Evaporative Emissions.
Maps BMW M56
Model
From 2003 to 2005 - 325iA (E46) sedan, coupe, and sport wagon with automatic transmission only.
Market
Sales of this model began in 2003. E46 SULEV is only sold in 4 states in the US. California, New York, Massachusetts and then in 2004 in Vermont.
Specifications
- HC block in air intake system:
The release of hydrocarbons through the intake system is prevented due to the use of additional carbon filters incorporated in the air filter housing and the "closed" throttle valve actuator.
- Fuel system components:
All components of the metal fuel system (fuel rail, injector, tank ventilation valve, etc.) are made of stainless steel and tied together using a connector type connection.
- Fuel tank system and ventilation tank:
Fuel tanks, tank filling neck and evaporative tubes are made of stainless steel. Both the fuel pump and fuel filter are completely sealed in the gas tank and require complete replacement of the gas tank if the fuel pump or filter fails.
- Karter ventilation system:
The crankcase venting valve is incorporated in the aluminum cylinder head cover.
- The system components used to achieve SULEV exhaust emission requirements:
- Double flow catalytic converter
- "Heating" catalytic converter - a high cell density technology
- Upstream oxygen sensor - wide band technology
- Piston - only 3mm fire ground
- VANOS - is set to fixed position during startup for upgraded engine start
- New style fuel injector-4 hole design (fuel pressure 5 bars)
Secondary air systems with secondary air mass flow sensors are used to improve monitoring of secondary airflow.
In addition SULEV models also incorporate "Direct Ozone Reduction Systems". The external radiator heat exchange surface is coated with a catalyst that reduces ozone in the ambient air drawn through the radiator.
BMW M56 SULEV Gallery
External links
- BMW-Planet.com - M56 machine specifications
Source of the article : Wikipedia
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