Details
Genuine CCEC Cummins NTA855-G1B Diesel Engine for 50Hz Generator Sets
The Chongqing Cummins NTA855-G1B is a staple prime and standby power source for industrial-grade diesel generator packages. Rated at 284kW (380HP) for prime applications and stepping up to 321kW (430HP) for emergency standby services at a stable 1500RPM, this heavy-duty 14L diesel engine provides high torque density within a compact, mechanical structural footprint.
As an established industrial power engine supplier, HekoPower stocks, rigorously inspects, and globally delivers original CCEC N855 series generator engines. We provide comprehensive component matching, performance certifications, and verified logistics options directly to commercial genset manufacturers and facility operators worldwide.
Tech Specs of Cummins NTA855-G1B
General Engine Data
Engine Model: Cummins NTA855-G1B
Type: 6 Cylinders in Line, 4 Stroke Diesel
Displacement: 14 L
Bore * Stroke: 140 * 152
Net Weight: 1410 Kg
Overall Dimension: 1980mm*900mm*1600mm
Key Performance Data
Rated Power/Standby Output: 284 kW/380HP, 321 kW/430HP
Rated Speed: 1500 rpm
Low Idle Speed: 575-650 rpm
Fuel Consumption @ Rated Power: 68 L/Kw.h
Torque @Rated/Standby Output: 1808/2044 N.m @ 1500 rpm
More Technical Data
Fuel System: Cummins PT Pump, Direct Injection
Aspiration: Turbocharged & Aftercooled
Electrical System (Starter Motor/Alternator): 24V/900A
Governor Type: Mechanical Control
Compression Ratio: 14:1
Lowest Starting Temp (Without auxiliary system): -12℃
Coolant Volume (Engine Only): 20.8 L
Cooling Method: Water Cooled
Technical Architecture and System Performance Comparisons
PT Fuel System vs. Modern Common Rail Injection
Unlike electronic high-pressure common rail (HPCR) systems found in modern engines, the Cummins NTA855-G1B utilizes the classic Cummins PT (Pressure-Time) fuel pump and mechanical injectors. In remote mining operations, rural telecom stations, or continuous construction sites, fuel quality often varies wildly.
High-pressure common rail setups rely on delicate piezo injectors operating at up to 2,000 bar. This makes them highly susceptible to microscopic water particles and sulfur sediment, often leading to immediate electronic fault shutdowns.
The mechanical PT fuel system uses large internal clearances and positive cam-actuated injection dynamics. This allows the engine to burn standard industrial-grade fuel safely without forcing unexpected downtime. It handles minor fuel inconsistencies while maintaining a clean 208.8 g/kW·h fuel rate at full prime load.
Turbocharged Aftercooling (TA) Output Efficiency
The "A" in NTA855 signifies a water-to-air aftercooling jacket configuration paired with a high-efficiency exhaust gas turbocharger. Compressing intake air naturally increases its temperature, which decreases oxygen density and hurts thermal efficiency.
By pulling water from the cooling loop through the aftercooler core, the intake air charge temperature drops significantly before hitting the intake valves. For an industrial standby generator engine, this system delivers:
- Higher air density inside the combustion chamber for a cleaner burn.
- Uniform 14.0:1 compression across all six inline cylinders.
- Fast transient response, allowing emergency backup generators to pick up full block loads within 10 seconds of grid failure.
Alternator Integration and Structural Dimensions
Radiator and Alternator Matching Rules
Assembling a reliable 50Hz diesel genset requires careful calculations to match the NTA855-G1B with the right electrical components. For a standard 250kW continuous / 280kW standby open-frame or silent generator assembly, our engineering team uses these specific guidelines:
- Alternator Selection: The engine uses standard SAE 1 flywheel housing dimensions with an SAE 14 flywheel connection. We recommend pairing it with a Stamford S4L1D-E41 or a Marathon 430CSL1463 alternator. This ensures the 0.8 power factor load alignment handles a continuous 313kVA electrical output without overheating the stator windings.
- Radiator Configuration: The NTA855-G1B has an engine-only coolant capacity of 20.8 liters, expanding to 60.6 liters when paired with a standard 50°C ambient cooling radiator. If you are building an enclosed canopy or containerized backup generator station, the cooling fan requires 11.6 kW of mechanical power. This draft must clear a minimum air flow requirement of 7.6 cubic meters per second to prevent thermal de-rating during peak loads.
Real Application Scenarios and Duty Cycles
Data Center and Hospital Standby Power
For critical backup systems like hospital life-safety grids or telecom data networks, the engine must deliver Emergency Standby Power (ESP) without hesitation. Under ESP guidelines, the engine runs under variable loads for the duration of a utility outage, up to a maximum of 200 hours per year. The NTA855-G1B provides 321kW of emergency power in these situations. Our technical packages include 24V jacket water preheaters to keep the cylinder block block warm (~40°C), ensuring instant starting capability even in cold weather.
Continuous Prime Power in Mining and Construction Sites
When main grid power is unavailable, the engine shifts to an Unlimited Time Running Prime Power (PRP) duty cycle. It delivers a continuous 284kW (380HP) output across variable loads for unlimited hours annually. To maximize your engine's lifespan on heavy industrial job sites, avoid running at an average load factor above 70% of the prime rating over any 250-hour operating window. A 10% overload capacity (321kW) is available for emergency handling, but limit this to exactly 1 hour within any 12-hour operating period.
Technical Comparison with Other Cummins Generator Engines
NTA855-G1B vs NT855-GA
The NTA855-G1B generally provides improved turbocharging performance and higher power output compared with the older NT855-GA platform. For projects requiring higher standby capacity and improved transient response, the G1B configuration is usually preferred.
NTA855-G1B vs KTA19 Generator Engine
The KTA19 platform offers higher power output and electronic control options, but the NTA855-G1B remains attractive for customers prioritizing simpler maintenance and lower operating costs.
In regions with limited technical support infrastructure, mechanical generator engines are often easier to maintain over long operating periods.
Advantages Compared with High-Speed Engines
Some modern compact engines operate at higher RPM ranges to reduce overall size. However, many industrial customers continue selecting low-speed heavy-duty engines because they typically offer:
- longer overhaul intervals,
- lower operating stress,
- better continuous load capability,
- improved durability under harsh environments.
Maintenance Guidelines and Spare Parts Management
Preventive Service Intervals
Sticking to a strict preventive maintenance schedule keeps your 14L engine running reliably for years.
- Daily Check: Inspect the mechanical air restriction indicator, check the engine oil dipstick level, and look for water pooling in the fuel separator.
- Every 250 Hours or 6 Months: Replace the spin-on lubricating oil filters, clean the raw water separator element, and swap out the dual spin-on fuel filters. Inspect the fan drive belt tension.
- Every 1500 Hours or 1 Year: Calibrate the mechanical PT fuel pump pressure parameters, inspect injector spray patterns, and adjust the valve lash clearances (0.28mm intake, 0.58mm exhaust).
Overhaul Kits and Component Cross-Referencing
When it is time for a mid-life rebuild or a full engine overhaul, HekoPower provides complete component replacement support. We stock genuine CCEC components, including cylinder liners with pre-installed seals, oversized main bearings, and comprehensive upper and lower gasket kits.
Every engine we supply features a clear stamped data plate showing its unique factory Engine Serial Number (ESN) and Control Parts List (CPL) code (such as CPL 1183). This tracking system guarantees that every replacement piston ring or crankshaft seal we ship perfectly matches your specific build configuration, saving you time and money during field overhauls.
Rigorous Pre-Shipment Inspection and Export Logistics
HekoPower's 4-Stage Testing Procedure
Every Cummins engine shipped from our facility undergoes a strict testing protocol to ensure performance before it leaves the factory. We do not drop-ship unverified machinery.
- Static Seal Check: The cooling, lubrication, and fuel lines are pressurized to inspect for any gasket leaks.
- 2-Hour Dynamometer Testing: The engine runs on our automated dyno test benches through a full performance cycle: 30 minutes at 50% load, 30 minutes at 75% load, 45 minutes at 100% prime capacity, and a final 15-minute verification at 110% overload.
- Transient Governor Calibration: We test the mechanical governor's response to sudden load adjustments to confirm that frequency fluctuations stay well within the strict tolerances required by ISO 8528.
- Fluid Diagnostics: Post-test engine oil and coolant samples are checked for metal flakes or internal cross-contamination.
Export Packaging and Seaworthy Protection
Ocean freight exposure can rust bare precision steel components. HekoPower protects your investment with specialized export packaging protocols:
- We drain all testing fluids and spray the internal fuel and oil galleries with anti-rust storage oil.
- The entire engine is wrapped in heavy-duty VCI (Vapor Corrosion Inhibitor) plastic film and vacuum-sealed.
- The sealed power unit is securely bolted onto an export-compliant, IPPC fumigated wooden skid base and enclosed in a thick plywood crate. This protects your components from high humidity during ocean transit and makes unloading with cranes or forklifts simple.
Cummins N855-G Series, original products from Chongqing Cummins Engine Plant(CCEC). This series mainly includes NT855-G, NT855-GA, NT855-G1, NT855-G1A, NT855-G1B, NTA855-G2, NTA855-G2A, NTA855-G3, NTA855-G4, NTA855-G7, NTA855-G7A.
Frequently Asked Questions Regarding Sourcing and Operation
What is the standard lead time for a genuine CCEC NTA855-G1B engine?
For standard configurations, HekoPower maintains regular warehouse stock. Orders are typically ready to ship within 7 to 10 business days after down payment verification. This buffer allows us to complete our full 4-stage pre-shipment dynamometer testing and custom seaworthy export crating.
Does the NTA855-G1B carry a valid emissions certificate?
The Chongqing Cummins NTA855-G1B meets national Euro II emission standards for off-road machinery. It is an ideal fit for export markets across Africa, the Middle East, Southeast Asia, and specific Latin American industrial regions. For projects in markets with stricter regulations, contact our technical team to discuss alternative after-treatment options or newer electronic product alternatives.
What specific warranty terms apply to engines sourced from HekoPower?
Every genuine CCEC industrial generator engine we ship includes a 12-month factory warranty, capped at 1,000 hours of operation from the initial commissioning date. The warranty covers all major internal structural castings, including the engine block, forged crankshaft, camshaft assembly, and cylinder head units, against structural manufacturing defects.
What generator size is suitable for the NTA855-G1B?
The engine is commonly matched with industrial diesel generator sets in the 300kVA class, depending on alternator efficiency and standby or prime power requirements.
