Details
Chongqing CCEC Cummins NTA855-G1A G-Drive Engine: 261kW 1500RPM Generator Drive Power
The Chongqing Cummins (CCEC) NTA855-G1A is an in-line 6-cylinder, 14-liter heavy-duty diesel engine engineered specifically for 50Hz generator drive applications running at 1500 RPM. Featuring a 140 mm x 152 mm bore and stroke, turbocharged and jacket-water aftercooled aspiration, and Cummins' signature PT (Pressure-Time) fuel system, the NTA855-G1A delivers a continuous prime rating of 261 kW (350 HP) and a standby power output of 291 kW (390 HP).
As a dedicated factory-direct engine supplier and technical exporter, HekoPower provides complete brand-new CCEC NTA855-G1A fan-to-flywheel engine assemblies. Purpose-built to drive 250kVA to 275kVA prime generator sets and up to 300kVA standby units, this model balances heavy mechanical reliability with exceptional load acceptance across continuous-duty mining, commercial building, and industrial power plants.
Tech Specs of Cummins NTA855-G1A
General Engine Data
Engine Model: Cummins NTA855-G1A
Type: 6 Cylinders in Line, 4 Stroke Diesel
Displacement: 14 L
Bore * Stroke: 140 * 152
Net Weight: 1380 Kg
Overall Dimension: 1980mm*900mm*1600mm
Key Performance Data
Rated Power/Standby Output: 261 kW/350HP, 291 kW/390HP
Rated Speed: 1500 rpm
Low Idle Speed: 575-650 rpm
Fuel Consumption @ Rated Power: 61 L/Kw.h
Torque @Rated/Standby Output: 1662/1853 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: 15:1
Lowest Starting Temp (Without auxiliary system): -12℃
Coolant Volume (Engine Only): 20.8 L
Cooling Method: Water Cooled
Technical Comparisons Across the 14-Liter Platform
Navigating the Cummins 14-liter engine catalog requires analyzing the hardware variations, turbocharger matches, and fuel injection calibrations that separate the NTA855-G1A from neighboring models.
NTA855-G1A vs. NTA855-G1 and NTA855-G1B
The baseline NTA855-G1 delivers roughly 240 kW prime at 1500 RPM. In contrast, the NTA855-G1A utilizes an upgraded Holset turbocharger profile combined with refined PT fuel pump governor settings to yield 261 kW (350 HP) prime power. This 21 kW increase is achieved without altering engine displacement or outer dimensions, maintaining full footprint interchangeability.
While the NTA855-G1B is calibrated primarily for specialized standby or lower-altitude installations with lighter duty cycles, the NTA855-G1A retains heavy-duty heat-resistant valve train components and reinforced piston crowns. These internal upgrades enable the G1A variant to handle continuous block-loading demands without experiencing thermal fatigue.
NTA855-G1A vs. NTA855-G2 and NTA855-G2A
Stepping up to the NTA855-G2 and G2A models pushes output to 287 kW (385 HP) and 310 kW (415 HP) prime, respectively. However, higher output brings increased cylinder pressures and higher thermal rejection demands.
The NTA855-G1A operates at a moderate 14.0:1 compression ratio and lower peak combustion temperatures. In tropical or high-ambient environments where cooling capacity is constrained, the NTA855-G1A provides a broader thermal safety margin and reduced thermal stress on cylinder liners compared to the higher-strung G2 variants.
NTA855-G1A vs. Naturally Aspirated and Non-Aftercooled NT855-GA
The non-aftercooled NT855-GA relies solely on turbocharging, limiting combustion efficiency and air intake density. The "A" designation in the NTA855-G1A signifies the addition of an aftercooler circuit.
By cooling the compressed air leaving the turbocharger before it enters the intake manifold, the NTA855-G1A increases charge air density. This improves fuel economy by 5% to 8% over non-aftercooled engines while reducing peak exhaust gas temperatures (EGT) by up to 60°C under full load.
Real-World Application Scenarios and Generator Sizing
Matching the NTA855-G1A to the correct alternator and operating environment prevents under-loading, wet-stacking, and premature component wear.
250kVA to 275kVA Prime Power Genset Coupling (50Hz / 1500RPM)
At 1500 RPM, the NTA855-G1A provides 261 kW of mechanical shaft power. Factoring in a typical alternator mechanical-to-electrical efficiency of 92% to 94% and a standard 0.8 power factor, this engine serves as the power core for 250kVA (200kWe) and 275kVA (220kWe) prime diesel generators.
It readily handles transient 100% single-step load applications, making it a reliable choice for off-grid telecommunications hubs, agricultural processing facilities, and remote construction sites.
300kVA Standby Operations and Radiator Sizing
For emergency standby duty, the engine delivers up to 291 kW (390 HP), allowing generator original equipment manufacturers (OEMs) to pair it with 300kVA standby alternators.
During standby operations, the cooling system must handle a jacket water heat rejection rate of approximately 145 kW at full load. HekoPower recommends specifying a pusher radiator rated for a minimum 50°C ambient temperature capability to prevent thermal derating during high-temperature utility outages.
Common Misconceptions and Buyer Traps
Avoid costly procurement and operational errors when sourcing 14-liter Cummins engines for power generation projects.
Misconception 1: Over-Rating Prime Power as Continuous Standby Output
A common mistake in generator specification is running the NTA855-G1A continuously at its 291 kW standby rating. Standby ratings are intended strictly for emergency use during utility power loss, capped at an average 70% load factor over a 24-hour period. Running the engine at 291 kW continuously causes thermal distortion of valve seats and accelerates piston ring wear. Continuous operations must adhere strictly to the 261 kW prime power rating.
Misconception 2: Treating All CPL Numbers as Inter-changeable
The Control Parts List (CPL) code—such as CPL 0924 or CPL CQ103—defines the exact bill of materials used to assemble the engine. This includes fuel pump button sizes, injector orifice counts, turbocharger housing angles, and flywheel housing SAE dimensions. Ordering a generic engine without verifying the exact CPL number can result in alignment discrepancies with the alternator or incompatible governor linkages.
Misconception 3: Confusing Remanufactured Engines with Factory-Fresh CCEC Units
Due to the global popularity of the NTA855 platform, gray-market suppliers often recondition old truck blocks and sell them as new generator engines. A genuine CCEC Cummins engine supplied by HekoPower features a unique factory dataplate, a traceable Engine Serial Number (ESN), factory inspection records, and original paint over all joint seals.
Maintenance Schedules, Fuel Systems, and Overhaul Guidance
Adhering to structured preventative maintenance protocols ensures the NTA855-G1A reaches a service life exceeding 20,000 to 25,000 operating hours before requiring a major overhaul.
PT Fuel System and Injector Servicing
The Cummins PT (Pressure-Time) fuel system uses a positive displacement gear pump and camshaft-actuated injectors. Unlike high-pressure common rail systems, the PT system relies on precise mechanical clearances.
Inspect and adjust valve and injector overhead clearances every 1,500 operating hours. Clean the fuel pump inlet magnetic screen during scheduled oil changes to keep the governor assembly free of metallic debris.
Holset Turbocharger Care and Overhaul Kits
The NTA855-G1A relies on a heavy-duty Holset turbocharger. Inspect the compressor wheel for oil film build-up and check the shaft for radial or axial play every 2,500 hours.
When conducting a mid-life refresh or complete overhaul, always use genuine CCEC overhaul kits. These kits include matched cylinder liners, crown pistons, piston rings, main bearings, and CPL-matched injector nozzles to maintain factory fuel economy standards.
Navigating the CCEC NTA855 Engine Series
Selecting the appropriate engine for a generator fleet requires evaluating structural compatibility and power curves across the entire CCEC product range.
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 (FAQ)
What is the exact fuel consumption of the NTA855-G1A at 1500 RPM?
At 100% prime power (261 kW @ 1500 RPM), the CCEC NTA855-G1A consumes approximately 205 to 210 g/kWh, which equates to roughly 63 to 66 liters per hour. At 75% load, fuel consumption drops to approximately 47 to 50 liters per hour.
What are the export shipping dimensions and weight for a complete NTA855-G1A engine?
A complete fan-to-flywheel CCEC NTA855-G1A engine assembly has a dry weight of approximately 1,330 kg to 1,400 kg. Standard export packing dimensions inside a reinforced wooden case are approximately 1,650 mm (L) x 1,050 mm (W) x 1,350 mm (H).
How can I verify that an engine supplied by HekoPower is a genuine CCEC unit?
Every genuine CCEC engine includes an engraved metallic dataplate on the engine block containing the Engine Serial Number (ESN), CPL number, and build date. You can verify the ESN directly through CCEC official channels or request factory test certificates prior to dispatch.
What warranty coverage and delivery lead times does HekoPower offer?
HekoPower provides standard factory export warranties covering 12 months or 1,500 operating hours from commissioning. Standard production and dispatch lead times for complete brand-new engine assemblies typically range from 2 to 4 weeks.
