Volvo B200ET Specifications
| Engine Model: Volvo B200ET |
| Engine Type: 4-cycle 4-cylinder SOHC 8-valve turbocharged liquid-cooled gasoline |
| Total Displacement: 121.2 cu.in (1.98 L) |
| Rated Engine Power: 158 Hp (118 kW) at 5500 rpm |
| Fuel System Type: Bosch Motronic fuel injection |
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The Volvo B200ET engine is a high-performance,
turbocharged and intercooled inline-four cylinder gasoline powerplant.
It is a definitive variant within Volvo's renowned red-block B200 engine
family, developed as the successor to the earlier non-intercooled B19ET.
Introduced in the mid-1980s, this engine was engineered to provide a
significant increase in power and torque for Volvo's 700-series vehicles
while preserving the legendary durability of the cast iron block.
The B200ET combines a robust eight-valve crossflow cylinder head with a
water-cooled turbocharger, a front-mounted air-to-air intercooler, and
Bosch Motronic engine management. Designed for longitudinal installation
in rear-wheel-drive chassis, it delivers a strong, linear power band
with pronounced turbocharged character. This engine established a
reputation for reliability, mechanical simplicity, and significant
tuning potential, cementing its status as a favorite among enthusiasts
of classic turbocharged Volvos.
Engine family: B200 (Red Block).
Engine type: Inline-four cylinder, four-stroke Otto cycle, turbocharged
and intercooled.
Displacement: 1986 cc (121.2 cubic inches).
Bore: 88.9 mm (3.500 inches).
Stroke: 80.0 mm (3.150 inches).
Compression ratio: 8.5:1.
Maximum power output: 158 Hp (118 kW) at 5500 rpm.
Maximum torque output: 195 lb-ft (265 Nm) at 3000 rpm.
Boost pressure: 0.6 bar (8.7 psi) over atmospheric pressure.
Firing order: 1-3-4-2.
Engine orientation: Longitudinal.
Aspiration: Water-cooled turbocharger (Garrett T25 or Mitsubishi TD04)
with air-to-air intercooler.
Fuel type: Premium unleaded gasoline (95 RON).
Recommended oil grade: SAE 15W-40 or 10W-40, meeting API SF/CC or later
specifications.
Oil capacity: 4.8 liters (5.1 U.S. quarts), including filter.
Coolant capacity: 8.2 liters (8.7 U.S. quarts).
The cylinder block is a cast iron unit from Volvo's red block family,
identifiable by its factory-applied red paint. This block is a
deep-skirt design, providing immense strength and rigidity which is
essential for handling the stresses of turbocharging. The block
incorporates four cylinder bores, cast integrally. The crankshaft is
supported by five main bearings, a design that improves smoothness and
durability over earlier three-bearing red blocks.
The crankshaft is a forged steel component. Main bearing caps are cast
iron and secured with two bolts each. Connecting rods are forged from
steel. Pistons are cast aluminum alloy, featuring a dished crown
designed for the lower compression ratio required for forced induction.
Each piston is fitted with three rings: two compression rings and one
oil control ring. The block has generous oil and coolant passages to
manage the increased thermal loads.
The cylinder head is a cast iron, crossflow design. It employs a single
overhead camshaft (SOHC) driven by a timing belt. The valvetrain uses
eight valves total (two valves per cylinder). Valve actuation is direct,
with the camshaft lobes acting on inverted bucket-type followers. Valve
clearance is adjusted by replacing shims located atop the followers, a
design requiring specialized tools for service.
The intake and exhaust ports are located on opposite sides of the head
(crossflow), which improves volumetric efficiency. Intake valves are
larger than exhaust valves. Valve seats are hardened to withstand
elevated exhaust temperatures from turbocharging. The combustion chamber
is a hemispherical design.
The fuel system is managed by a Bosch Motronic 1.8 engine control unit.
This is an integrated system controlling both fuel injection and
ignition timing. It uses an airflow meter (flap-type or later hot-wire)
to measure engine load. Fuel is delivered by an electric in-tank pump to
a constant-pressure fuel rail. The system uses Bosch multi-port fuel
injectors.
The ECU receives signals from multiple sensors, including a knock
sensor, to adjust timing and fuel delivery in response to boost and
engine conditions. A boost control solenoid, regulated by the Motronic
system, manages wastegate actuator pressure to maintain the target boost
level. This electronic control represents a significant advancement over
the purely mechanical boost control of earlier turbo Volvo engines.
The lubrication system is a pressure-fed, full-flow filtration wet-sump
design. A gear-type oil pump is driven by the crankshaft. Oil is drawn
from the steel oil pan through a pickup screen. The oil is pressurized
and forced through a full-flow, spin-on cartridge oil filter. From the
filter, oil feeds the main gallery in the cylinder block. It supplies
the crankshaft's five main bearings and connecting rod bearings via
drilled passages.
A separate feed line supplies the cylinder head, lubricating the
camshaft bearings and valvetrain. A critical dedicated feed line
supplies oil to the turbocharger's center bearing cartridge. Oil drains
back from the turbocharger via a large-diameter return line to the sump.
Oil pressure is monitored by a sender unit for the dashboard gauge.
The cooling system is a pressurized, forced-circulation design with
specific enhancements for turbocharging. The water pump is driven by the
timing belt. A separate coolant circuit flows through the turbocharger's
center housing to prevent oil coking after engine shutdown. The system
employs a large aluminum radiator. An electric cooling fan is
thermostatically controlled.
The defining feature is the air-to-air intercooler, mounted in front of
the radiator. This intercooler lowers the temperature of the compressed
intake charge, increasing its density and reducing the risk of
detonation. The ignition system is integral to the Motronic ECU,
utilizing a single ignition coil and a distributor, or a distributorless
system on very late models. The wastegate is integral to the
turbocharger housing.
0The external dimensions of the B200ET engine are compact for its
displacement and output, a result of the inline-four configuration and
efficient packaging. Approximate length is 700 mm (27.56 inches).
Approximate width is 650 mm (25.59 inches). Approximate height is 700 mm
(27.56 inches). These dimensions include the turbocharger, intake
manifold, and ancillary components. The weight of a complete B200ET
engine, with all fluids and standard accessories, is approximately 175
kg (386 lbs). The cast iron block and head contribute to this
substantial mass.
Engine oil and filter changes are critical; a 8000 kilometer (5,000
mile) or 6-month interval is recommended for severe turbocharged
service. The timing belt and tensioner must be replaced every 80,000 km
(50,000 miles) or 5 years without exception to prevent catastrophic
engine damage. Valve clearance inspection and adjustment via shim
replacement is required every 40,000 km (25,000 miles).
Spark plugs should be replaced every 20,000 km (12,500 miles). The fuel
filter requires replacement every 30,000 km (18,600 miles). The
intercooler and associated piping should be inspected for leaks.
Turbocharger oil and coolant lines must be checked for integrity.
Coolant should be replaced every 2 years.
Torque values are for clean, dry threads. Cylinder head bolts are
tightened in a specific multi-stage sequence: final torque 65 Nm (48
lb-ft) plus an additional 90-degree turn. Main bearing cap bolts: 75 Nm
(55 lb-ft). Connecting rod cap bolts: 50 Nm (37 lb-ft).
Crankshaft pulley bolt: 150 Nm (111 lb-ft). Camshaft sprocket bolt: 70
Nm (52 lb-ft). Spark plugs: 25 Nm (18 lb-ft). Oil drain plug: 40 Nm (30
lb-ft). Turbocharger oil feed line banjo bolt: 25 Nm (18 lb-ft). Exhaust
manifold nuts: 30 Nm (22 lb-ft).
The Volvo B200ET engine was the high-performance turbocharged option for
Volvo's rear-wheel-drive 700-series platform throughout the late 1980s.
Primary applications include: Volvo 740 Turbo (744/745) from 1985
onward. Volvo 760 Turbo (764/765). Volvo 780 coupe (Turbo model for
certain markets). It directly replaced the non-intercooled B19ET engine,
offering improved performance, driveability, and thermal management.
The B200ET was succeeded in the early 1990s by the more powerful
16-valve B230FT engine. Its legacy is defined by its role in
popularizing turbocharging in practical family cars, offering accessible
performance and establishing the "red block" as a platform for extensive
modification and tuning.
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