Engine, General
Engine General
B5244S6 And B5244S, USA
General
B5244S6, SULEV+ (Super Ultra Low Emission Vehicle), California
- The B5244S6 is based on the B5244S
- Corresponds to emissions regulations PZEV (Partial Zero Emission Vehicle). This car must satisfy statutory warranty, exhaust and EVAP regulations
- Introduced only in the S60 and V70
- Due to emissions requirement, only available in California
- Maximum torque 225 Nm. Maximum power 123 kW
- DENSO engine management system
- New ETA (Electronic Throttle Actuator)
- Start is based on the Wide Range concept
- Only available with automatic transmission AW 55-50SN
- The final drive ration is 2.65:1 to ensure good response.
B5244S
- Only available in the 125 kW version
- DENSO engine management system
- New ETA (Electronic Throttle Actuator)
- Start is based on the Wide Range concept
- Available with both manual and automatic transmissions
- Final drive 2.44:1.
B5244S6, News
Cylinder Head
Cylinder head with CVVT (Continuous Variable Valve Timing) for both the intake and exhaust camshafts.
Change Over Angle CVVT:
- intake = 60 crankshaft degrees
- exhaust = 30 crankshaft degrees.
Wide Range. When cold starting in positions P, N (automatic transmissions) or neutral (manual transmissions), the engine speed may initially reach approximately 2000 rpm before dropping immediately to approximately 1650 rpm for 15 - 20 seconds. The engine then runs at a low ignition setting and lean lambda. The engine speed (RPM) then drops to idle speed approximately 750 rpm. This is to reduce the emissions during the warm-up phase.
The camshaft toothed belt is reinforced to increase service life. The belt tensioner has a new gasket to ensure an optimal seal.
Pistons
Graphite coated pistons.
The pistons have a two piece oil control ring. The design of a stainless steel ring with nitrated steel spring ensures good service life. The thickness of the oil control ring is 2 mm.
Evaporative Emission Canister (EVAP Canister) In The Air Cleaner (ACL) Housing
An EVAP canister is integrated in the air cleaner (ACL) housing.
There is no service interval for the EVAP canister. If the canister is damaged and needs to be replaced, the entire cover must be replaced.
The canister absorbs the hydro-carbons which return through the air cleaner when the engine is switched off. When the engine is started, the absorbed hydro-carbons enter into the air flow and are combusted.
Crankcase Ventilation
The connection nipple for the crankcase ventilation at the intake manifold has been modified to provide more even distribution of the crankcase vapors between the cylinders. A positive temperature coefficient (PTC) element prevents freezing.
The flame trap has a labyrinth which efficiently separates oil from the crankcase vapors before they are returned to the intake manifold.
Resonator
There is a resonator on the hose between the mass air flow (MAF) sensor and the ETA (Electronic Throttle Actuator). This is to satisfy European legal requirements for vehicle sound levels. By modifying the unfavorable frequencies which occur at high engine speeds, the sound levels of the intake and exhaust systems are reduced.
When the pulses affect the measurement function of the mass air flow (MAF) sensor, software in the engine control module (ECM) compensates for this. Because the pulses have been reduced, the software has also been modified from previous engine control modules (ECM).
If the resonator is removed, the signals from the mass air flow (MAF) sensor will be incorrectly interpreted by the engine control module (ECM).
Electrical Cooling Fan For The Control Module Box
The fan starts when the temperature in the control module box reaches approximately +70 degree C and stops at approximately +65 degree C. The temperature sensor in the engine control module (ECM) is used as a reference.
Three-way Catalytic Converter (TWC)
The manifold with the catalytic converter, CCC (Closed Coupled Catalyst), has double ceramic monoliths.
The Under Floor Catalyst (UCF) has a ceramic monolith.
B5244S, ULEV (Ultra Low Emission Vehicle)
Differences From B5244S6:
- CVVT (Continuous Variable Valve Timing) only for the intake camshaft. Change over angle CVVT intake = 60 crankshaft degrees
- Emissions regulations apply for 100 000 miles/10 years
- The pistons have three piece oil control rings, 2.5 mm thick
- A new manifold gives improved torque at low engine speeds
- No EVAP canister in the air cleaner (ACL) housing
- Only an under floor catalyst with two ceramic monoliths and integrated muffler.
B5254T2
General
- Based on the B5244T3
- There have been a number of changes to the engine, resulting in improved performance and lower emissions
- A modified length of stroke results in a cylinder capacity of 2521 cu.cm.
- Meets the emissions requirements for EURO 2005 (EURO 4) and ULEV II
- The maximum torque of 320 Nm is reached at 1500 rpm
- Maximum power is 154 kW (210 hk) at 4800 rpm
- Engine management system Bosch ME 7.01
- The start sequence is based on the Wide Range concept.
Crankshaft, Crankshaft Bearing
Stroke of 93.2 mm. Forged. Weight: 21559 grams. Connecting rod pins: dia. 50.00 mm. Main bearing journals: dia. 65.00 mm.
Both the upper and lower crankshaft bearings are aluminum. The upper bearing has a lubrication hole.
Connecting Rods, Connecting Rod Bearing
Forged connecting rods with split covers. Length center to center = 145 mm. Weight = 634 grams.
Both the upper and lower bearings are aluminum.
Pistons
Graphite coated pistons.
Diameter/length gudgeon pin = 21 mm/60 mm.
Cylinder Head, Camshafts
Cylinder head with CVVT (Continuous Variable Valve Timing) for both the intake and exhaust camshaft.
Change over angle CVVT:
- intake = 50 crankshaft degrees
- exhaust = 30 crankshaft degrees.
Other
Flame trap with labyrinth.
Modified manifold providing improved gas flow and more exhaust energy to the turbine in the turbocharger (TC). Gives a quicker turbocharger response.
The camshaft toothed belt is reinforced to increase service life. The belt tensioner has a new gasket to ensure an optimal seal.