Cummins QSX15-G8 Specifications
| Engine Model: Cummins QSX15-G8 |
| Engine Type: 4-stroke in-line 6-cylinder turbocharged liquid-cooled diesel |
| Total Displacement: 912 cu.in (15 L) |
| Rated Engine Power: 540-671 Hp (403-500 kW) at 1500-1800 rpm |
| Fuel System Type: High Pressure Injection |
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The Cummins QSX15-G8 represents a pinnacle of
heavy-duty industrial engine design, purpose-built for demanding prime
and standby power generation applications. This 15-liter, in-line
6-cylinder platform leverages a robust foundation with advanced
electronic control to deliver exceptional power density and reliability.
Its dual fixed-speed operational capability at 1500 and 1800 RPM allows
seamless integration into 50 Hz and 60 Hz power grids globally.
The engine is distinguished by its full-authority electronic fuel
system, high-pressure injection, and a dual overhead camshaft
valvetrain, ensuring precise combustion management, low emissions
compliance, and sustained performance under continuous load.
Designed for serviceability, the QSX15-G8 prioritizes durability through
a high-strength cylinder block, a comprehensive lubrication system with
substantial capacity, and a cooling system engineered for high ambient
temperatures. This configuration makes it a preferred choice for data
centers, healthcare facilities, industrial complexes, and other critical
infrastructure where uninterrupted power is mandatory.
Engine Type: 4-cycle, In-line, 6-cylinder diesel.
Displacement: 15.0 L (912 cu.in).
Aspiration: Turbocharged and Charge Air Cooled.
Bore and Stroke: 137 mm x 169 mm (5.39 in x 6.65 in).
Compression Ratio: 17.0:1.
Valvetrain: 24-valve, Dual Overhead Cam (DOHC).
Firing Order: 1-5-3-6-2-4.
Operational Speeds: 1500 RPM (50 Hz) and 1800 RPM (60 Hz).
Power At 1500 RPM (50 Hz)
Standby Power: 448 kW (601 HP).
Prime Power: 403 kW (540 HP).
Power At 1800 RPM (60 Hz)
Standby Power: 500 kW (671 HP).
Prime Power: 455 kW (610 HP).
The cylinder block is a deep-skirt, cast-iron design that provides
exceptional rigidity and noise reduction. This structure incorporates a
stiffened bedplate construction, which enhances the overall strength of
the lower engine assembly and supports the main bearing bores to
minimize crankshaft deflection under high cylinder pressures. The
in-line configuration with six cylinders features pressed-in,
replaceable wet-type cylinder liners.
These liners are induction-hardened to resist wear and allow for
efficient heat transfer directly to the coolant jacket. The block design
includes optimized internal ribbing to dampen vibrations and provide a
stable mounting base for the integrated front gear train, which drives
the camshafts, fuel pump, and accessory equipment.
The cylinder head is constructed from high-strength alloy cast iron and
utilizes a cross-flow design to maximize volumetric efficiency. The Dual
Overhead Cam (DOHC) valvetrain employs four valves per cylinder - two
intake and two exhaust - to optimize airflow and fuel mixture
homogeneity. The intake valves are 45 mm in diameter, while the exhaust
valves are 41 mm.
Each valve is actuated via roller followers and hydraulic lash
adjusters, which maintain zero valve clearance, thereby reducing
maintenance requirements and ensuring consistent performance. The
valvetrain is enclosed within a composite rocker cover that also serves
as an integral component of the engine’s crankcase ventilation system.
Valve seats are constructed from a high-temperature alloy to withstand
the thermal stresses associated with sustained high-load operation.
The engine employs the Cummins HPI-PT (High Pressure Injection) full
authority electronic fuel system. This system is a time-based,
high-pressure common rail architecture that operates independently of
engine speed to deliver fuel at pressures up to 1,600 bar (23,206 psi).
The system comprises a gear-driven high-pressure fuel pump, a stainless
steel fuel rail, and electronically controlled unit injectors.
The injectors utilize a closed-loop control system to precisely meter
fuel delivery for each combustion event, enabling multiple injection
strategies that reduce combustion noise and optimize emissions. The
system is managed by a full-authority electronic control module that
adjusts injection timing, duration, and pressure based on real-time
sensor inputs including engine speed, load, coolant temperature, and
intake manifold pressure.
The lubrication system is a pressurized, full-flow design featuring a
high-capacity gear-type pump mounted within the front timing gear
housing. System pressure is regulated by a piston-type relief valve.
Total system oil capacity is 91.0 L (24 U.S. gal). The engine utilizes a
replaceable full-flow spin-on oil filter and a separate bypass filter to
ensure continuous contaminant removal.
The oil pan configuration offers two capacities depending on
installation: high-capacity configuration holds 83.3 L, while the
low-capacity configuration holds 72.0 L. A deep-draw oil sump is
designed to maintain oil pressure during operation on inclines up to 25
degrees in any direction. The system includes an integrated oil cooler,
which is a plate-and-fin heat exchanger cooled by engine coolant to
maintain optimal oil viscosity under sustained high-temperature
operation.
The cooling system is a pressurized, centrifugal pump-driven circuit
with a thermostat-controlled bypass to facilitate rapid warm-up. Coolant
capacity for the engine alone is 24.0 L (6.3 U.S. gal). When equipped
with a standard radiator, the total system capacity increases to 42 L.
The system is designed to accommodate a maximum static head of coolant
above the crankshaft centerline of 18.3 m, ensuring reliable coolant
circulation even in elevated skid or remote radiator installations.
The coolant pump is gear-driven from the front gear train and
incorporates a high-flow impeller to maintain consistent cooling across
all six cylinders. The charge air cooler (CAC), integrated into the
cooling package, reduces intake air temperature to enhance combustion
efficiency and reduce thermal stress on the engine.
| Intake and Exhaust Systems |
Air Intake System: Filtration is achieved through a heavy-duty, dry-type
air cleaner with a replaceable radial seal element. The turbocharger is
a wastegated unit designed for high-altitude applications, capable of
maintaining sea-level power output up to 1,500 m (5,000 ft) without
derating.
Exhaust System: The engine is equipped with a water-cooled turbocharger
housing and exhaust manifold to reduce surface temperatures in enclosed
installations. Exhaust backpressure at rated power must not exceed 10.2
kPa at the outlet flange.
The engine utilizes a 24-volt negative ground electrical architecture.
The starting system consists of a 24-volt, 7.5 kW electric starter motor
with an integral solenoid. The charging system is provided by a 24-volt,
100-ampere alternator with a self-exciting regulator. The minimum
recommended battery capacity is 1200 CCA (cold cranking amps) at -18°C
(0°F).
The engine is governed by the Cummins PowerCommand or CM570 Electronic
Control Module (ECM). This microprocessor-based unit integrates all
engine management functions, including governing, fuel injection
control, air-fuel ratio control, and system diagnostics. The ECM
utilizes a 24-volt power supply and features a Controller Area Network
(CAN) for seamless communication with generator set controllers and
facility management systems.
It incorporates a comprehensive diagnostic system with fault code
logging, allowing for expedited troubleshooting. The governor is an
all-speed electronic type providing isochronous or droop operation with
±0.25% speed regulation under steady-state conditions.
Length: 1612 mm (63.5 in).
Width: 1032 mm (40.6 in).
Height: 1230 mm (48.4 in).
Dry Weight: 1,365 kg (3,009 lb).
Wet Weight (with fluids): 1,421 kg (3,133 lb).
Oil Change Interval: Under prime power application using recommended
oil, the change interval is 500 hours or 12 months, whichever occurs
first. Oil Filter Change: Perform concurrently with each oil change.
Fuel Filter Replacement: Replace primary and secondary fuel filters at
500-hour intervals.
The system utilizes a 2-micron absolute secondary filter. Air Filter
Maintenance: Inspect at 500-hour intervals; replace when restriction
reaches 5.0 kPa under load. Valve Lash Adjustment: Not required due to
hydraulic lash adjusters; however, periodic inspection of valvetrain
components is recommended at 2,000-hour intervals.
Coolant Maintenance: Replace coolant and flush system every 2,000 hours
or 24 months, contingent on using extended-life coolant. Drive Belt
Inspection: Inspect serpentine accessory drive belt at 500-hour
intervals; replace at 1,500 hours or as indicated by wear or cracking.
Cylinder Head Bolts (M20 x 2.5): 300 Nm (221 lb-ft).
Connecting Rod Cap Bolts (M12 x 1.5): 120 Nm (89 lb-ft).
Main Bearing Cap Bolts (M16 x 2.0): 250 Nm (184 lb-ft).
Flywheel Bolts (M14 x 1.5): 140 Nm (103 lb-ft).
Crankshaft Damper Bolt (M20 x 1.5): 550 Nm (406 lb-ft).
Injector Clamp Bolt: 25 Nm (18 lb-ft).
Rocker Cover Bolts: 25 Nm (18 lb-ft).
Exhaust Manifold to Cylinder Head: 45 Nm (33 lb-ft).
Turbocharger Mounting Nuts: 55 Nm (41 lb-ft).
The QSX15-G8 is predominantly utilized in stationary industrial power
generation equipment.
Generator Sets: Used as the prime mover in open-set and sound-attenuated
generator packages for standby, prime, and continuous power in data
centers, hospitals, manufacturing facilities, and telecommunications
infrastructure.
Irrigation Systems: Deployed in large-scale agricultural irrigation
pumping systems where sustained high power output is required for
extended durations.
Mining Equipment: Utilized in stationary power modules for electric
drive systems, ventilation fans, and dewatering pumps within mining
operations.
Oil and Gas: Employed in well fracturing, gas compression, and crude oil
pumping applications where reliability in remote locations is critical.
Railway Infrastructure: Integrated into wayside power modules for signal
systems, switching stations, and backup power for rail transit networks.
Marine Auxiliary: Installed as an auxiliary generator engine on
commercial vessels to supply shipboard power for operations while in
port or during navigation.
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