Volvo B4204S2 Specifications
| Engine Model: Volvo B4204S2 |
| Engine Type: 4-cycle inline 4-cylinder DOHC 16-valve liquid-cooled gasoline |
| Total Displacement: 118.9 cu.in (1.95 L) |
| Rated Engine Power: 134 Hp (100 kW) at 6000 rpm |
| Fuel System Type: Sequential multi-point electronic fuel injection |
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The Volvo B4204S2 engine is a naturally
aspirated inline-four cylinder gasoline powerplant from Volvo's modular
engine family. Introduced in the mid-2000s, this engine was developed as
a refined and efficient power unit for base and mid-level trims of
Volvo's larger vehicles. It represents a mature iteration of the modular
design, focusing on smooth operation, reliability, and meeting stringent
Euro IV emissions standards.
The engine employs a dual overhead camshaft (DOHC) layout with four
valves per cylinder and features variable valve timing. Constructed with
an aluminum alloy block and head, it provides a favorable balance of
weight and durability. The B4204S2 is characterized by its linear power
delivery, lack of turbocharger complexity, and seamless integration with
Volvo's electronic management systems. It served as a dependable and
cost-effective powertrain solution during a period preceding the
widespread adoption of forced induction for base engines.
Engine family: Volvo Modular Engine (B4).
Engine type: Inline-four cylinder, four-stroke Otto cycle, naturally
aspirated.
Displacement: 1948 cc (118.9 cubic inches).
Bore: 83.0 mm (3.268 inches).
Stroke: 90.0 mm (3.543 inches).
Compression ratio: 10.3:1.
Maximum power output: 134 Hp (100 kW) at 5800-6000 rpm.
Maximum torque output: 136 lb-ft (185 Nm) at 4500 rpm.
Redline: 6500 rpm.
Firing order: 1-3-4-2.
Engine orientation: Transverse.
Aspiration: Naturally aspirated.
Fuel type: Premium unleaded gasoline (95 RON).
Recommended oil grade: SAE 0W-30 or 5W-30, meeting ACEA A5/B5 or Volvo
specification.
Oil capacity: 5.8 liters (6.1 U.S. quarts), including filter.
Coolant capacity: 8.0 liters (8.5 U.S. quarts).
The cylinder block is a high-pressure die-cast aluminum alloy unit. This
construction provides a significant reduction in overall engine mass
compared to cast iron designs. The cylinder bores are fitted with
pressed-in grey cast iron liners, which offer a durable, wear-resistant
running surface for the piston rings and ensure long-term cylinder
integrity. The block is a closed-deck design, a feature that enhances
block rigidity, improves cylinder bore stability, and minimizes noise,
vibration, and harshness (NVH).
The crankshaft is supported by five main bearings. The crankshaft is a
forged steel component, carefully balanced to ensure smooth operation.
Main bearing caps are manufactured from nodular cast iron and are
secured with two vertical bolts each. Connecting rods are forged from
steel. Pistons are aluminum alloy with a specific skirt profile and a
crown contour designed to achieve the 10.3:1 compression ratio. Each
piston is cooled by oil spray jets and is fitted with two low-tension
compression rings and one multi-piece oil control ring.
The cylinder head is a cast aluminum alloy unit. It employs a dual
overhead camshaft (DOHC) layout, with each camshaft operating sixteen
valves (four valves per cylinder). This four-valve design optimizes
airflow into and out of the combustion chamber. Valve actuation is via
finger followers with hydraulic lash adjusters. This system provides
automatic valve clearance compensation throughout the engine's service
life, eliminating the need for manual adjustment. A key feature is the
inclusion of variable valve timing.
The system, often Volvo's Continuous Variable Valve Timing (CVVT), is
hydraulically actuated and adjusts the timing of the intake camshaft,
and in some applications the exhaust camshaft, to optimize performance,
fuel economy, and emissions across the engine speed range. The camshafts
are driven by a silent timing chain. Intake valves have a diameter of
31.0 mm (1.220 inches). Exhaust valves have a diameter of 27.0 mm (1.063
inches). Valve seats are hardened for durability.
The fuel system is a sequential multi-port electronic fuel injection
system. It is managed by a Bosch Motronic 7.0 or Siemens engine control
unit (ECU). The system uses a hot-wire air mass meter to provide a
precise measurement of engine load. Fuel is delivered by an in-tank
electric fuel pump to a constant-pressure fuel rail. The fuel pressure
regulator is mounted on the fuel rail. The injectors are mounted
directly in the intake manifold.
The system incorporates a drive-by-wire electronic throttle (ETC). This
replaces a traditional mechanical throttle cable, allowing the ECU to
precisely control throttle plate position for optimal drivability, idle
stability, and integration with traction and stability control systems.
The ECU receives input from dual knock sensors, enabling individual
cylinder ignition timing adjustment to prevent detonation and allow for
optimal performance on various fuel grades.
The lubrication system is a pressure-fed, full-flow filtration wet-sump
design. It utilizes a variable-displacement vane-type oil pump. This
pump design adjusts its output volume based on engine demand, reducing
parasitic losses and improving overall fuel efficiency compared to a
fixed-displacement pump. The oil pan is constructed from stamped steel.
Oil is drawn through a pickup screen, pressurized, and routed through a
full-flow cartridge-style oil filter mounted on the cylinder block.
From the filter housing, oil feeds the main gallery in the block. It
supplies the crankshaft's five main bearings and connecting rod bearings
via drilled passages. A separate oil passage feeds the cylinder head,
lubricating the camshaft bearings, hydraulic lash adjusters, finger
followers, and the variable valve timing actuator. The timing chain
tensioner is also oil-pressure activated. Oil level is monitored by an
electronic sensor.
The cooling system is a pressurized, forced-circulation design. A
centrifugal water pump is driven by the timing chain. The thermostat is
electronically controlled, allowing the engine management system to
regulate coolant temperature more precisely for optimal efficiency and
emissions. The system uses an aluminum radiator with plastic header
tanks. Engine cooling is managed by an electric cooling fan, or fans,
controlled by the ECU based on coolant temperature and air conditioning
demand.
The ignition system is a coil-on-plug design. Each cylinder has its own
ignition coil mounted directly on the spark plug, eliminating spark plug
wires and allowing for individual ignition timing control. The engine
management system fully integrates control of the variable valve timing,
electronic throttle, and fuel injection. An exhaust gas recirculation
(EGR) system and a evaporative emissions (EVAP) control system are
present for emissions compliance.
The external dimensions of the B4204S2 engine are compact for a
transverse-mounted 2.0-liter inline-four. Approximate length is 580 mm
(22.83 inches). Approximate width is 680 mm (26.77 inches). Approximate
height is 660 mm (25.98 inches). These dimensions include major
ancillary components such as the intake manifold and alternator. The
weight of a complete B4204S2 engine, with all fluids and standard
accessories, is approximately 135 kg (298 lbs). The extensive use of
aluminum alloys for the block and head is the primary factor in
achieving this relatively low mass.
Engine oil and filter change intervals are governed by Volvo's Condition
Based Service (CBS) system, which calculates service needs based on
driving style and conditions. A standard fixed interval is 15,000 km
(9,321 miles) or 12 months, whichever occurs first. The timing chain and
its guides are designed for the engine's service life and do not have a
scheduled replacement interval; however, inspection for wear or
stretching is prudent after 250,000 km (155,343 miles).
Spark plug replacement is required every 60,000 km (37,282 miles) or 4
years, using specified iridium or platinum plugs. The accessory drive
belt (serpentine belt) should be inspected every 60,000 km and replaced
at signs of cracking or wear. Coolant replacement is recommended every
240,000 km (149,129 miles) or 10 years. The engine air filter should be
replaced every 60,000 km or as indicated by the service reminder.
All torque values are specified for clean threads lightly coated with
engine oil, unless stated otherwise. Cylinder head bolts are tightened
using a multi-stage angular torque procedure: initial torque 40 Nm (30
lb-ft), followed by an additional 90-degree turn, and a final 90-degree
turn. Main bearing cap bolts: 25 Nm (18 lb-ft) plus an additional
50-degree turn.
Connecting rod cap bolts: 30 Nm (22 lb-ft) plus an additional 85-degree
turn. Crankshaft pulley bolt: 120 Nm (89 lb-ft) plus an additional
90-degree angle. Camshaft sprocket bolts: 55 Nm (41 lb-ft). Spark plugs:
25 Nm (18 lb-ft). Oil drain plug: 40 Nm (30 lb-ft). Oil filter housing
cap: 25 Nm (18 lb-ft).
The Volvo B4204S2 engine was installed in a range of Volvo's
front-wheel-drive and all-wheel-drive models from approximately 2006 to
2012. Primary applications include: Volvo S80 (second generation, as the
base 2.0 or 2.0F engine). Volvo V70 (third generation, as the base 2.0
engine for certain markets). Volvo XC70 (second generation, as the base
2.0 engine in some regions). Volvo XC60 (first generation, early models
as the base 2.0 engine).
It was often marketed simply as the 2.0 or 2.0F. This engine provided
adequate power for these larger vehicles while prioritizing smoothness
and fuel economy over outright performance. It was phased out as Volvo
began introducing its new, more efficient four-cylinder Drive-E engines
and as consumer demand shifted toward turbocharged powerplants even for
base models.
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