Cummins QSL9-G5 Specifications
| Engine Model: Cummins QSL9-G5 |
| Engine Type: 4-stroke in-line 6-cylinder turbocharged liquid-cooled diesel |
| Total Displacement: 543 cu.in (8.9 L) |
| Rated Engine Power: 305-476 Hp (228-355 kW) at 1500-1800 rpm |
| Fuel System Type: High Pressure Common Rail |
____________________________________________________________________________________
The Cummins QSL9-G5 represents a sophisticated
integration of electronic control and robust mechanical design within
the 8.8-liter displacement class. Designed primarily for prime and
standby power generation, this inline 6-cylinder engine leverages a High
Pressure Common Rail (HPCR) fuel system to deliver precise combustion
management. The architecture emphasizes reliability through the
elimination of external leak paths by integrating fluid circuits
directly into the cylinder block.
A 24-valve cylinder head configuration supports high-altitude
performance and rapid load acceptance, making the unit suitable for both
50 Hz and 60 Hz applications. The engine is engineered for a significant
reduction in operational noise and improved cold-start capability,
adhering to stringent international emissions standards without the
complexity of aftertreatment systems in its base configuration.
The Cummins QSL9-G5 is a turbocharged and charge-air-cooled diesel
engine configurable for variable speed operation. Its power ratings are
defined by application standards for standby, prime, and continuous duty
cycles.
Engine Configuration: Inline, 6-cylinder, 4-stroke
Displacement: 8.9 L (543 cu.in)
Bore x Stroke: 114 mm x 145 mm (4.49 in x 5.69 in)
Aspiration: Turbocharged and Charge Air Cooled
Compression Ratio: 16.8:1
Fuel System: Bosch High Pressure Common Rail (HPCR)
Dry Weight: 714 kg (1,575 lbs) - Fan to Flywheel
Oil System Capacity: 26.5 L (7.0 U.S. gal) - Total including filter
Coolant Capacity: 11.0 L (2.9 U.S. gal) - Engine only
Power Rating At 1500 RPM (50 Hz)
Standby Power (ESP): 310 kWm (415 BHP)
Prime Power (PRP): 268 kWm (359 BHP)
Continuous Power (COP): 228 kWm (305 BHP)
Power Rating At 1800 RPM (60 Hz)
Standby Power (ESP): 355 kWm (476 BHP)
Prime Power (PRP): 307 kWm (412 BHP)
Continuous Power (COP): 261 kWm (350 BHP)
The cylinder block is constructed from high-strength gray iron with a
deep-skirt design. This structural configuration provides a rigid
foundation for the crankshaft and reduces vibration transmission. The
block utilizes a parent bore design, eliminating the need for cylinder
liners and enhancing structural integrity.
Fluid circuits - including those for the coolant and lubricating oil -
are cast directly into the block architecture. This design strategy
replaces external hoses and significantly reduces potential leak points.
The integrated routing contributes to the engine’s compact footprint and
improves overall reliability by minimizing the number of connection
points exposed to thermal cycling and vibration.
The engine features a single, high-pressure cylinder head manufactured
from alloy cast iron. The overhead valve configuration employs a
24-valve design, utilizing four valves per cylinder. This arrangement
optimizes airflow into the combustion chamber, facilitating a high swirl
ratio that improves combustion efficiency and cold-start performance.
The valve train includes hardened valve seats and hydraulic lash
adjusters, which eliminate the need for routine valve clearance
maintenance. The cross-flow design separates intake and exhaust
pathways, promoting efficient thermal management and contributing to the
engine’s ability to handle high continuous loads.
The fuel system is a Bosch High Pressure Common Rail (HPCR) system,
operating independently of engine speed. This system utilizes a
high-pressure fuel pump to pressurize a common rail that supplies fuel
to electronic injectors. The electronic control module (ECM) governs
injection timing, duration, and pressure with high precision.
This allows for multiple injection events per combustion cycle, such as
pilot and main injections, which reduce combustion noise and lower
emissions. The system supports the engine’s transient response
capabilities, ensuring immediate power delivery during load acceptance
in generator set applications.
The lubrication system is a pressurized, full-flow filtration loop. A
gear-type positive displacement pump draws oil from the sump and routes
it through a spin-on full-flow filter. The oil filter features a
high-capacity design to extend service intervals.
The system includes an integrated oil cooler that is mounted directly to
the block, utilizing engine coolant for thermal regulation. The total
oil system capacity, inclusive of the filter housing, is 26.5 L (7.0
U.S. gal). The engine utilizes a bypass oil filtration option to enhance
contaminant removal for applications requiring extended runtime.
The cooling system operates on a centrifugal water pump driven directly
by the gear train. The pump circulates coolant through the integrated
block passages and the cylinder head. The system utilizes a
remote-mounted radiator in generator set configurations, though the
engine is equipped with a gear-driven fan hub capable of driving
high-volume cooling fans.
The engine-only coolant capacity is 11.0 L (2.9 U.S. gal). The charge
air cooler is a separate air-to-air or air-to-water system that reduces
intake air temperature to optimize combustion efficiency and maintain
thermal stability under high load factors.
| Intake and Exhaust Systems |
Air Intake System: Filtration is provided by a heavy-duty,
replaceable-element air cleaner. The turbocharger is a wastegated design
that provides precise boost control, protecting the engine from
over-speed while ensuring adequate airflow for combustion across the
operating range.
Exhaust System: The exhaust manifold is designed to withstand high
thermal stress and is integrated with the turbocharger mounting flange.
The engine is certified to meet TA Luft and CE emissions standards,
typically operating without the need for selective catalytic reduction
(SCR) or diesel particulate filter (DPF) aftertreatment in standard
configurations.
The engine is controlled by a fully integrated Electronic Control Module
(ECM) that monitors parameters such as intake manifold pressure, coolant
temperature, oil pressure, and crankshaft position. The system supports
SAE J1939 CAN communication for remote monitoring and control. The
starting system is configured for 12 V or 24 V electrical systems with a
high-torque starter motor.
Dry Weight: 714 kg (1,575 lbs)
Overall Length (Fan to Flywheel): 1,150 mm (45.3 in)
Overall Width: 870 mm (34.3 in)
Overall Height: 1,150 mm (45.3 in)
Oil Change Interval: Up to 500 hours under prime power duty using CES
20081 or CES 20086 compliant oil.
Oil Filter Replacement: Every oil change interval.
Fuel Filter Replacement: Every 500 hours or annually.
The system utilizes a dual-stage filtration with a pre-filter and
primary filter equipped with a water-in-fuel sensor.
Air Filter Service: Dependent on operating conditions; monitored by a
restriction indicator.
Valve Lash Adjustment: Not required due to hydraulic lash adjusters.
Coolant Change Interval: 2,000 hours or 2 years for extended-life
coolant.
Crankcase Ventilation: Closed crankcase ventilation (CCV) filter
replacement recommended at 1,500-hour intervals to maintain crankcase
pressure specifications.
Connecting Rod Bolts: 130 Nm (96 lb-ft).
Main Bearing Cap Bolts: 300 Nm (221 lb-ft).
Cylinder Head Bolts (M16): 100 Nm (74 lb-ft).
Flywheel Housing to Block: 80 Nm (59 lb-ft).
Crankshaft Damper Bolt: 550 Nm (405 lb-ft).
Injector Clamp Screw: 40 Nm (30 lb-ft).
Fuel Rail Mounting Bolts: 25 Nm (18 lb-ft).
While the QSL9-G5 is predominantly utilized in stationary power
generation, the engine platform serves a broad range of off-highway and
industrial applications.
Power Generation: The primary application is generator sets (gensets)
for standby, prime, and continuous power in data centers, hospitals,
commercial facilities, and industrial plants. The engine supports both
50 Hz and 60 Hz grid requirements.
Industrial: Used in material handling equipment, mining machinery, and
agricultural irrigation systems where the engine is configured as a
power unit.
Off-Highway Equipment: Found in mobile applications such as large
excavators, wheel loaders, and forestry equipment where the compact
packaging of the 8.8-liter platform provides a high power-to-weight
ratio.
Rail and Marine: Derivatives of the QSL platform are utilized in railcar
propulsion and auxiliary power units, as well as in commercial marine
propulsion and auxiliary generator sets where the emissions compliance
and reliability are required.
____________________________________________________________________________________
| Industrial Engines Technical Specifications |
| Car Engines Technical Specifications |
| Small Engines Technical Specifications |
| Outboard Engines Technical Specifications |
