BUS POWER

L9 AND L9N Euro VI Engines

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 DELIVERING
PREMIUM
PERFORMANCE
Unique among engine platforms, the 8.9-litre L Series RELIABILITY DESIGNED-IN
combine the robust characteristics of a higher
Stable platform architecture has driven a long track
displacement, heavy-duty engine with the efficiency
record of success, reflected today by the fact that
and lower operating costs of a smaller, midrange
around 50,000 L Series engines enter service every
engine. This fusion of attributes gives the ability
year. Successive engine upgrades have avoided
to power a remarkably broad range of vehicles,
adding unnecessary complexity, an approach that
from 12 to 24-metre buses, including tri-axle
can be seen with the latest engines certified to
double-deckers, as well as touring, commuter
Euro VI Phase-D. While meeting strict emissions
and intercity coaches.
criteria, they retain all the inherent reliability, strength
and deep reserves of torque that operators have
Across these applications, the L9 clean diesel
come to expect from their L engines.
delivers premium levels of performance and has
earned a reputation for dependability unsurpassed
in the bus industry. The capability of the L Series
is further enhanced with the L9N natural gas
version, achieving close-to-zero emission
levels. Sharing the same engine block and
electronic management system as the
L9 diesel also brings the benefit of 80
percent component commonality
between the two engines.

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 SMART
EFFICIENCY
The compact envelope and high
power density of the L9 and L9N
bring a significant installation
advantage, together with an engine
management system that seamlessly
integrates into the vehicle controls.
Smarter electronics also means that
engine diagnostics and trip data can
be quickly accessed with Cummins
digital service tools, and instantly
converted into easy to read analytics
to enable proactive maintenance
when its needed.

The L Series engines

feature turbochargers
specifically designed
by Cummins to
enable a more rapid
response to increasing
engine loads. The
L9 diesel utilises a
Variable Geometry
Turbocharger
(Cummins VGT™) to

5B 5X 72
realise higher torque
delivery and lower
emissions, while

72A
the L9N features a
simpler wastegate
turbocharger
ideally suited to
cleaner natural
gas combustion.

Metr
o
Metro Sunnyno
ok

Route
Destinatio
n
Due

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 EXTENDED
LIFE
While the L9 and L9N achieve the longest life to
overhaul of any comparable engine, Cummins goes
even further by designing-in ease of mid-life overhaul
so that operators can maximise their investment by
keeping buses on the road for longer. Scheduled
engine service requirements are few and far between,
meaning that a bus fleet goal of over 95 percent
uptime availability is fully achievable with the L Series.

The L9 and L9N are packed with high-strength

componentry to significantly lower thermal and L9
mechanical stress levels. As a result, the L Series
achieves remarkably high standards of in-service
dependability and long-term durability, while XPI FUEL SYSTEM:
operating even under the most challenging duty The Cummins XPI Fuel System
cycles. These premium features include: utilised on the L9 diesel is derived from the larger
X12 and X15 engines, bringing the advantage
ƒƒ Wet cylinder liners ensure better heat of extra-high pressure fuel injection with cleaner,
dissipation and a faster engine warm-up time more fuel-efficient combustion at all engine speeds.
ƒƒ Replaceable liner design for easier This state-of-the-art common rail design delivers
mid-life overhaul smoother and more rapid engine response to
ƒƒ Forged-steel crankshaft and connecting increasing vehicle demands, with the Cummins
rods for extra strength engine control module adjusting fuel injector and
pump parameters to ensure consistent fuel injection
ƒƒ Steel pistons with targeted oil cooling
performance. The compact, single-cylinder XPI
to lower temperatures
pump is self-lubricated by the fuel, avoiding the
ƒƒ Robust steel roller cam followers need for oil cooling with a corresponding reduction
for reduced friction in oil consumption.

1871

Söderväm

G
130
Pendeln Lund

Skånetrafiken

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 STEP AHEAD TO PHASE-D
The 2019 Euro VI Phase-D regulatory step is particularly relevant for bus operations, as it is focused on
tighter control limits for NOx emissions during lower speed city operations and under cold start conditions.
Certification is dependent on test results taken during real-world driving operations, verifying results first taken
under engine emissions test cell conditions. On-road testing with Cummins Phase-D engines during typical
city bus duty cycles have indicated a further 25 percent reduction in Nitrogen Oxides (NOx) compared to the
initial Phase-A engines when Euro VI was first introduced in 2015.

Both the L9 and L9N feature a crankcase ventilation system designed by Cummins to re-route gases
back to the engine to give a more complete combustion and help eliminate oil-based emissions.

L9N

HYBRID L9 CLOSE-TO-ZERO L9N

Cummins has achieved a Euro VI and EPA The L9N offers a low-cost natural gas
technology achievement by powering thousands pathway to achieve close-to-zero emissions.
of hybrid buses operating in Europe and Testing under bus duty cycle conditions has
North America, making a major contribution to demonstrated the ability of the L9N to reach
improving air quality and reducing the carbon NOx emissions levels around 80 percent below
footprint. Cummins ‘H’ version of the L9 is that of the Euro VI standard. The reduction
specially configured to integrate with the hybrid in Particulate Matter emissions is equally
driveline and provide a seamless engine on/ impressive, with levels around 90 percent
engine off function for the vehicle. On-road lower than the Euro VI standard.
testing with Cummins engines on city bus duty
cycles has indicated that Nitrogen Oxide (NOx) The spark-ignited stoichiometric combustion is
emissions are capable of being reduced to 50 more efficient with upgraded electronic controls
percent below the Euro VI standard. and a new Ignition Control Module introduced
to meet the Phase-D emission standard.
Hybrid drive buses typically reduce fuel Vehicle sociability is further enhanced with the
consumption and related CO2 emissions by L9N natural gas engine bringing a substantial
around 33 percent, with the downsized engine reduction in engine noise across all engine
contributing an important part of that reduction. speeds compared to a diesel engine. When
With hybrid engine capability, this provides tested at full engine load, the L9N achieves
operators with the energy choice they need close to a 70 percent reduction in sound
alongside conventional clean diesel drivelines, pressure levels.
the option of renewable natural gas power, full
electric and fuel cell solutions from Cummins.

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 COACH POWER
The L9 engine offers a highly productive power are the remarkably lower costs for operators in
solution for high-deck 12-metre coaches focused terms of not just fuel consumption, but also service
on cost-effective versatility for operating on touring, and maintenance.
commuter, intercity or student transportation.
For these applications the L9 is available with Fuel and CO2 reductions are even more impressive
specific coach ratings up to 400 hp and 1700 Nm with a next generation of coaches looking to use
peak torque, releasing the full potential of the 8.9-litre the L9 hybrid-adapted engine or the L9N natural
while retaining much lower operating costs than gas engine with close-to-zero emissions. Utilising
engines in the 11-to-13-litre class. these engines brings the benefit of carbon reduction
while also allowing coaches to freely operate in city
The L9 achieves this while delivering rapid acceleration low emission zones and in other environmentally
and high cruising speeds, but what really sets the sensitive areas.
L Series apart from much larger coach engines

L9

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 L9N

FLEET DECARBONISATION
Beyond the With the ability to run on either Compressed
substantial fuel saving Natural Gas (CNG) or Liquified Natural Gas (LNG),
benefits offered by the L9N reduces CO2 greenhouse gas emissions
BIODIESEL HVO the latest L9 engine, by around 15 percent compared to an equivalent
an even lower diesel engine. The L9N is fully compatible with
carbon footprint can be achieved when running operating on Biogas, also known as Renewable
on low carbon B20 biodiesel or HVO (Hydrated Natural Gas (RNG), replacing fossil-based natural
Vegetable Oil) renewable fuel. Compared with gas with a sustainable fuel option to offer the
conventional fossil-based fuel, HVO offers the option of fleet decarbonisation. Biogas is used as
potential to reduce greenhouse gas (GHG) either a blend with, or as a 100 percent substitute
emissions by 40 to 90 percent, depending for compressed natural gas.
on the feedstock of the fuel.

CNG LNG RNG

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 ENGINE RANGE specifications
BUS RATINGS

370 hp @ 2100 rpm (276 kW) 1600 Nm @ 1300 rpm

L9
340 hp @ 2100 rpm (254 kW) 1500 Nm @ 1200 rpm
320 hp @ 2000 rpm (239 kW) 1356 Nm @ 1300 rpm
L9N
280 hp @ 2000 rpm (209 kW) 1220 Nm @ 1300 rpm

COACH RATINGS

400 hp @ 2100 rpm (298 kW) 1700 Nm @ 1300 rpm

L9
370 hp @ 2100 rpm (276 kW) 1600 Nm @ 1300 rpm
L9N 320 hp @ 2000 rpm (239 kW) 1356 Nm @ 1300 rpm

HYBRID RATINGS

L9-H 370 hp @ 2100 rpm (276 kW) 1600 Nm @ 1300 rpm

l9 l9n
Displacement 8.9-litre 8.9-litre
Architecture EGR and Variable Geometry Turbocharger EGR and Wastegate Turbocharger
Ratings Range 254-298 kW / 340-400 hp 209-239 kW / 280-320 hp
Peak Torque 1700 Nm @ 1300 rpm 1356 Nm @ 1300 rpm
Dry Weight 712 kg 737 kg
Size L x W x H 1097 x 958 x 1160 mm 1125 x 956 x 1167 mm
Oil Drain Interval Up to 1,500 hours Up to 1,500 hours
Up to 45,000 km (city bus) or Up to 36,000 km (city bus) or
96,000 km (intercity/coach) 60,000 km (intercity/coach)

Note: oil drain intervals are dependent on application / duty cycle, based on using CK-4 API oil specification (CES 20086
approved for diesel and CES 20092 for natural gas) and average vehicle speeds.

Exhaust
aftertreatment l9 l9n

Architecture DPF-SCR switchback unit 3-Way Catalyst

Weight 105 kg 45 kg
Size L x W x H 1100 x 700 x 800 mm 1208 x 338 x 330 mm

DPF-SCR: The Diesel Particulate Filter and Selective Catalytic Reduction (DPF-SCR) exhaust aftertreatment is
modular and configurable, designed by Cummins to work with the engine as an integrated emissions control
system. The DPF-SCR combines with in-cylinder combustion and the Exhaust Gas Recirculation (EGR) system
to lower PM and NOx, certified to the 2019 Phase-D requirement of the Euro VI regulations.

TWC: The Three-Way Catalyst (TWC) aftertreatment upgraded for Euro VI Phase-D features a large catalytic
surface area and smart logic to help eliminate emissions during idle, cold starts or during multiple stop-start
operations. The ‘fit and forget’ aftertreatment is fully passive and requires no AdBlue injection, cleaning or
maintenance intervention.

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 L9 Torque

2000

1800

1600
400 hp
coach rating

Torque (Nm)
1400
370 hp
1200 bus rating
340 hp
1000 bus rating
800

600
600 800 1000 1200 1400 1600 1800 2000 2100
Engine Speed (rpm)

The L9 provides impressive levels of torque to enhance

acceleration and gradient climbing.

L9N Torque

2000

1800

1600
Torque (Nm)

1400

1200
320 hp
rating
1000
280 hp
800 rating

600
600 800 1000 1200 1400 1600 1800 2000 2100
Engine Speed (rpm)

High torque levels are delivered by the L9N to

improve vehicle driveability.

Seoul TOPIS

7017 6 7022 4
704 10 N15
405 , 401 , 406 , 70

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 DIGITAL
DIAGNOSTICS
Cummins INSITE™ performs engine
diagnostics and displays electronic engine
information on your PC. With step-by-step
diagnostics, built-in engine drawings and
schematic diagrams, working with INSITE
is easy. Using this software speeds up
troubleshooting procedures, helping to
minimise downtime and ensures your vehicle
can quickly be back on the road again.

Features:
ƒƒ Quick access to trip information
ƒƒ Adjust parameters and review/clear fault
information quickly and easily
ƒƒ Easy-to-follow troubleshooting assistance
ƒƒ Wiring and sensor location diagram
ƒƒ Store engine and trip information for future
use, or as a programming template

Using telematics, you can wirelessly connect

your engine for continuous monitoring and
diagnosis of system fault alerts using a
convenient Cummins mobile app, email or
web portal. Products such as Connected
Diagnostics and Connected Advisor can play a
major role in maximising the uptime availability L9N
of your fleet by setting up a diagnostic health
report, delivered automatically. This enables
preventative maintenance to be scheduled,
knowing what needs immediate action and
what can wait until the next service inspection.

Connected
Solutions ™

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 Estación
28311
Bulevar

41 52
98
98M 105 17
6
183 625 5N

NG
NYC DEPT OF TRANSPORTATION

S TA N D I

N
Midtown Manhattan BxM 3
Midtown BxM 4
5 Av &
E 79 St

L9

GLOBAL POWER
Cummins L9 and L9N are used by bus and coach manufacturers worldwide to meet all Euro equivalent
emissions standards and in North America are by far the highest volume engines in their class meeting
EPA regulations. L Series global capability is further enhanced with manufacturing facilities located in
Europe, North America, China, Brasil and India.

And, you can be sure, wherever there is a Cummins-powered bus, there is a Cummins service team
ready to provide expert technical support. From inspecting engine systems to training-up depot staff
or working with operators to minimise fuel consumption, this is all part of Cummins’ commitment to
support our customers.

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 Cummins Inc.
Box 3005
Columbus, IN 47202-3005
U.S.A.

cummins.com

Bulletin 5600461 Produced in U.K. Rev. 12/21

©2021 Cummins Inc.

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