Details
Cummins M11-C350 Industrial Diesel Engine (261kW / 350HP)
The Cummins M11-C350 is a heavy-duty 10.8-liter inline six-cylinder diesel engine engineered specifically for demanding industrial and construction applications. Manufactured under license by Chongqing Cummins Engine Co., Ltd. (CCEC), this engine delivers a rated power output of 261 kW (350 horsepower) at 2100 RPM. Built on the proven M11 platform, the C350 variant balances high power density with the rugged reliability needed for continuous operations in harsh environments.
At HekoPower, we supply original CCEC Cummins M11-C350 engine assemblies, short blocks, long blocks, and genuine replacement parts. Whether you need a complete power unit replacement for an excavator or a bare engine for a stationary equipment overhaul, our engineering team provides exact CPL matching and global export support to keep your operations running.
Tech Specs of Cummins M11-C350
General Engine Data
Engine Model: Cummins M11-C350
Type: 6 Cylinders in Line
Displacement: 10.8 L
Bore * Stroke: 125 * 147
Overall Dimension: 1450mm*950mm*1010mm
Net Weight (with flywheel & alternator): 980 Kg
Key Performance Data
Rated Power: 261 kW/350HP
Rated Speed: 2100 rpm
Max Torque/Speed: 1559 N.m @ 1300 rpm
Max. No-Load Speed: 2450 rpm
Fuel Consumption @ Rated Power: 64.4 L/hr
Idle Speed: 675-750 rpm
Max. Continuous Running Altitude: 3048 m
More Technical Data
Certification: Tier 1
Aspiration: Turbocharged-Intercooled
Fuel System: Direct Injection PT Pump, STC
Compression Ratio: 16.1:1
Electrical System (Starter Motor/Alternator): 12V/24V
Lowest Starting Temp Without auxiliary system: -12℃
Cooling Method: Water cooled
Engine Cooling Fluid Volume: 9.5 L
Performance Profile and Technical Comparisons
Selecting the correct engine rating within the Cummins M11 family depends heavily on duty cycle and thermal management requirements. The M11-C350 sits in the optimal mid-range spectrum of the 10.8L platform, providing substantial torque output without subjecting internal engine components to the maximum thermal stress found in higher-horsepower configurations like the M11-C380.
When comparing the M11-C350 against the higher-output M11-C380, the primary difference lies in fuel injection delivery calibration and turbocharger matching rather than physical block dimensions. The M11-C350 produces 1559 Nm of peak torque at 1300 RPM. This torque curve provides exceptional lugging capability when heavy machinery encounters sudden hydraulic resistance. The lower thermal load of the 350HP rating allows for longer continuous operation cycles under high ambient temperatures, making it a preferred choice for stationary crushers and rotary drilling rigs.
Compared to larger displacement platforms like the legacy NTA855, the M11-C350 offers a significantly lighter dry weight of approximately 980 kg. This power-to-weight ratio allows machinery manufacturers to reduce chassis structural weight without sacrificing output torque. Furthermore, the M11-C350 utilizes a mechanical PT (Pressure-Time) fuel system with Step Timing Control (STC). Compared to full electronic engines like the QSM11, the mechanical PT system on the CCEC M11-C350 provides superior tolerance to lower-grade diesel fuel often encountered on remote job sites, making maintenance simpler and field repairs faster.
Real Application Scenarios in Construction and Industry
The Cummins M11-C350 engine powers a wide range of heavy-duty mobile and stationary machinery across the global construction sector. Its speed control characteristics and rapid transient response make it particularly suited for equipment operating under fluctuating workloads.
In heavy earthmoving applications, the M11-C350 serves as the primary power unit for 30 to 35-ton hydraulic excavators and large wheel loaders. The engine's high low-end torque allows excavator hydraulic pumps to respond instantly under heavy digging cycles without engine stalling or excessive RPM drops.
In foundation engineering, this engine configuration is widely deployed in rotary drilling rigs and heavy crawler cranes. Rotary drills require sustained torque output at lower RPMs during deep drilling operations. The 1559 Nm torque output of the M11-C350 ensures constant cutter head rotation through rock strata.
The M11-C350 is also heavily utilized in high-volume concrete pump trucks, asphalt pavers, road rollers, and large water pump sets. For stationary power applications, HekoPower configures the M11-C350 as a complete power pack assembly including radiator, air cleaner, expansion tank, and industrial silencer, ready for mounting onto skid frames or industrial machinery.
Common Misconceptions About the M11-C350 Engine
Several common misunderstandings exist regarding the operation, compatibility, and maintenance of the Cummins M11-C350. Addressing these misconceptions helps fleet operators make informed procurement decisions.
A frequent misconception is that all Cummins M11 series parts are interchangeable across different horsepower ratings. While structural components like the cylinder block and crankshaft are identical across most M11 models, critical fuel delivery and breathing components are rating-specific. Installing an injector intended for an M11-C380 into an M11-C350 can lead to excessive cylinder pressures, over-fueling, high exhaust gas temperatures, and premature piston crown failure. Always match components using the engine CPL (Control Parts List) number.
Another common belief is that mechanical PT fuel systems cannot achieve low exhaust emissions or fuel efficiency compared to electronic engines. In reality, the STC (Step Timing Control) system on the CCEC M11-C350 dynamically advances injection timing during starting and light load operations, then retard timing during heavy loads. This mechanical timing control reduces white smoke on start-up and optimizes fuel consumption across the entire working load range.
Finally, equipment owners often assume that a damaged engine requires a complete, brand-new engine assembly replacement. In many cases, replacing the engine with a CCEC long block (which includes the block, crankshaft, connecting rods, pistons, and cylinder head assembly) allows you to reuse your existing PT pump, turbocharger, and external ancillaries, saving up to 40% in capital costs while retaining original engine reliability.
Field Maintenance and Troubleshooting Guide
Proper maintenance practices extend the operational life of the CCEC Cummins M11-C350 engine significantly. Addressing mechanical symptoms early prevents costly engine failures and equipment downtime on site.
Engine Black Smoke Under Load
Black exhaust smoke indicates incomplete fuel combustion, usually caused by an improper fuel-to-air ratio. First, inspect the air intake system for restricted air filters or collapsed ducting. Second, check the turbocharger compressor wheel for damage or oil contamination, and verify that the water-to-air intercooler core is clean. If air supply is normal, inspect the PT fuel injectors for worn spray tips or improper injector overhead setting adjustments.
Low Power Output and Poor Acceleration
When an M11-C350 exhibits power loss under load, the primary culprit is often fuel supply restriction or improper PT pump pressure. Replace all primary and secondary fuel filters and check for air aeration in the fuel supply line. Verify that the PT pump gear pump pressure matches factory performance curves. Additionally, check the operation of the STC valve; a stuck STC valve can prevent injection timing from adjusting correctly as load increases.
Hard Starting and Cold Start Issues
Difficulty starting an M11-C350 engine typically stems from air entering the PT fuel system, worn fuel pump gear teeth, or maladjusted mechanical valves. Ensure the fuel shutoff solenoid opens fully when turning the ignition key. If the engine emits white smoke while cranking without starting, verify that the STC system is supplying hydraulic oil pressure to advance the injector timing correctly during start-up.
Seamless Model Selection and Series Integration
The M11 platform offers versatility across multiple power bands to match specific equipment requirements. When selecting or replacing an engine, evaluating adjacent model ratings ensures your machinery operates within its design parameters.
Cummins M11-C Series, original products from Chongqing Cummins Engine Plant(CCEC). This series mainly includes M11-C225, M11-C245, M11-C250, M11-C265, M11-C270, M11-C275, M11-C280, M11-C290, M11-C300, M11-C310, M11-C315, M11-C320, M11-C330, M11-C335, M11-C350.
Frequently Asked Questions
How do I verify if the M11-C350 engine is compatible with my machine?
Check the engine nameplate located on the rocker housing cover for the CPL (Control Parts List) number and serial number. Provide this information to the HekoPower team, and we will cross-reference the CPL to confirm exact flywheel housing size, starter motor voltage, PT pump code, and engine mount compatibility.
What is the fuel consumption rate of the Cummins M11-C350?
At rated speed and power (261 kW @ 2100 RPM), the specific fuel consumption of the M11-C350 is approximately 205 g/kWh. Actual fuel consumption varies based on operating load factors, duty cycles, and proper maintenance of the PT fuel system.
Can Hekopower supply genuine CCEC spare parts for M11-C350 overhauls?
Yes. HekoPower supplies complete genuine CCEC spare parts kits, including piston kits, cylinder liners, main bearings, PT injectors, gasket sets, and turbochargers specifically matched to the M11-C350 engine specification.
What is the standard delivery lead time for an M11-C350 engine?
Standard engine assemblies are generally ready for shipment within 10 to 15 business days. Custom power pack configurations or specialized marine/industrial conversions typically require 15 to 20 business days prior to dispatch and export packaging.
