VOLVO
D9B 260/310 euro 5, eev
Engine
The D9B is a 9.4-litre, in-line six-cylinder diesel engine equipped with a turbocharger and intercooler and it is intended for city buses. The engine is available with power outputs of 260 and
310 hp and meets the EU’s exhaust emission standards according to Euro 5 and EEV*.
The D9B is built on the same basic construction principle as the larger
DH12E engine and features an overhead camshaft, four valves per
cylinder, unit injectors and a one-piece cylinder head. This design is
particularly lightweight.
The efficient combustion process together with after-treatment of
the exhaust gases using SCR (Selective Catalytic Reduction) techno­
logy means the engine is environmentally optimised, approved according to the Euro 5 emission norms. What is more, emission levels are
below the limit for EEV* (Enhanced Environmentally friendly Vehicle)
which imposes even higher demands, for instance requiring even lower levels of particulate emissions.
The highly efficient combustion is achieved thanks to the turbocharger’s high boost pressure and the engine’s high compression in
combination with precise and well-controlled unit injection. This is
done by electronically controlling the engine’s various functions with
EMS (Engine Management System). This helps minimise fuel consumption. At the same time, the system also provides advanced scope
for diagnostics and fault-tracing.
The timing mechanism is located on the flywheel side, giving the
engine particularly compact overall dimensions.
The D9B produces high torque from low revs, giving the engine
excellent lugging ability at low revs. This combined with a wide rev
range means the engine offers excellent driveability, with generous
power always on tap.
Efficient combustion is achieved through a variety of measures,
including high boost pressure from the turbocharger.
The Volvo D9B is a modern engine with an overhead camshaft and
four-valve technology, designed for a long and dependable lifetime.
Product benefits
• The engine offers a very wide torque range and responds alertly to the accelerator.
• Electronic engine management – EMS – with precise fuel injection promotes efficient combustion and low emissions.
• Exhaust treatment with SCR technology means the engine meets the EU’s tough environmental standards according to
Euro 5 and EEV*.
• Disruptions in the exhaust treatment system are shown in the display in the instrument panel.
• Centrally located unit injectors ensure symmetrical distribution of the fuel.
• Timing mechanism at the rear permits intelligent solutions for powering the alternator and air conditioner.
* Applies to certain versions.
BED 00363 2008-12-03 EN
volvo buses. when productivity counts
Approved for today’s and tomorrow’s environmental
standards
Thanks to its high efficiency rating, the D9B has low emissions. The
exhaust gases are further cleaned using SCR (Selective Catalytic Reduction) technology. This means that an additive known as AdBlue
Electronic engine management integrated into the
vehicle electronic system
The D9B engine is equipped with Volvo EMS 2.2 (Engine Management System) which means that the engine’s various functions are
monitored and controlled entirely electronically. EMS 2.2 provides ef-
is injected into the exhaust gases before they pass through an SCR
catalytic converter where the nitrogen oxide is converted into harmless nitrogen gas and water vapour. As a result, the emissions are so
low that the engine meets all the EU’s emission requirements as per
Euro 5 and EEV* (Enhanced Environmentally friendly Vehicle). Through
optimised calibration of the electronic engine management system,
hydrocarbon emissions have been able to be reduced by 30 % and
fective engine management as well as advanced scope for diagnostics and fault-tracing. Disruptions in the exhaust treatment system are
shown in the display in the instrument panel. The engine control unit is
connected to the vehicle electronic system’s datalinks.
smoke by 70 %, giving it EEV certification.
Symmetrical injection results in more efficient
combustion
The D9B is equipped with unit injectors that permit high injection
pressure. This high pressure is created mechanically via a roller rocker
arm that is driven by the overhead camshaft. The profile of the injection
cam is matched to the injector to give high lift. The cylinder head has
one single common fuel rail leading to the injectors, and the inlet ducts
and valves are of large diameter for low pressure drop. This construction promotes extremely precise injection and low fuel consumption
with high power and low emissions.
Torque
Nm
Output
kW
320
300
280
2000
260
* Applies to certain versions.
1800
240
Specifications
Type designation
Max power at 1900 r/min
Max revs
Max torque at 900-1500 r/min
D9B260
Euro 5/EEV
191 kW (260 hp)
2400 r/min
1100 Nm
Type designation Max power at 1900 r/min
Max revs
Max torque at 1100-1500 r/min
D9B310
Euro 5/EEV
228 kW (310 hp)
2400 r/min
1400 Nm
1600
220
1400
200
1200
180
1000
160
800
140
No. of cylinders
Bore
Stroke Displacement
Compression ratio
Oil-change volume, including oil filter
Oil filters, number
Weight
6
120 mm
138 mm
9.4 dm3
18.1:1
42 litres
2 full-flow, 1 bypass
938 kg
600
D9B-310 Euro 5
D9B-260 Euro 5
120
100
80
60
40
600
800
1000
1200
1400
1600
Equipment that is shown or mentioned in this publication may be optional or available as accessories and may vary from one country to another. We retain the right to alter specifications without prior notification.
1800
2000
rpm