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Engine type
2.5 Liter Six Cylinder Engine (M56 SULEV) The M56 is a re-engineered M54 engine to meet stricter emission requirements. Exclusively in the US.
Models
From 2003 to 2005 - 325iA (E46) sedan, coupe and sport wagon with automatic transmission.
Market
Sales of this model started in 2003. The E46 SULEV has only been sold in 4 states in the US. California, New York, Massachusetts and later in 2004 in Vermont.
Specs of the M56 engine - (From BMW note to dealers)
- HC block in the air intake system:
Hydrocarbon escape via the intake system is prevented due to the use of an additional carbon filter (1) incorporated in the air filter housing and a "closed" throttle valve actuator (2).
- Fuel system components:
All metal fuel system components (fuel rail (1), injectors (2), tank ventilation valve (3), etc.) are made of stainless steel and are fastened together using coupling type connectors (4).
- Fuel tank and tank ventilation system:
The fuel tank (1), tank filler neck (2) and evaporative canister (3) are made of stainless steel.
- Crankcase ventilation system:
The crankcase ventilation valve (1) is incorporated in the aluminum cylinder head cover (2).
- System components used to achieve SULEV tailpipe emission requirements:
(1) Dual down stream catalytic converters
(2) "Warm up" catalytic converters – high cell density technology
(3) Upstream oxygen sensors – wide band technology
(4) Pistons – only 3mm fire land
(5) VANOS – set to fixed position during start up for improved engine start
(6) New style fuel injectors–4 hole design (5 bar fuel pressure)
Secondary air system with secondary air mass flow sensor (1) used for improved monitoring of secondary air flow.
In addition SULEV models also incorporate a "Direct Ozone Reduction System". The external heat exchange surfaces of the radiator are coated with a catalyst which reduces the ozone in the ambient air drawn through the radiator.
Wikipedia content modification information:
- This page was last modified on 10 November 2008, at 15:39.
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