CCEC NTA855 Generator Drive Engine — 205–407 kW
The CCEC NTA855 series is one of the most proven generator drive engine platforms ever built by Chongqing Cummins Engine Co. (CCEC). This 6-cylinder inline, 14.0-liter four-stroke diesel covers a prime power range of 205–407 kW at 1500 RPM (50 Hz) and 287–358 kW at 1800 RPM (60 Hz), making it the backbone of 250–500 kVA generator sets worldwide. With the legendary Cummins PT fuel system, Holset turbocharger, and replaceable wet cylinder liners, the NTA855 has earned its reputation over decades of service in construction, mining, telecom, healthcare, and industrial backup applications.
NTA855 Generator Engine Models
CCEC produces 13 NTA855-series G-Drive ratings across naturally turbocharged (T), water-air aftercooled (TA), and air-air charge-cooled (TAA) configurations. Each model links to its dedicated product page with full data sheets, performance curves, and configuration options.
50 Hz Models (1500 RPM)
| Engine Model | Prime Power | Standby Power | Aspiration |
|---|---|---|---|
| NT855-G | 205 kW (275 HP) | 225 kW (302 HP) | Turbocharged (T) |
| NT855-GA | 231 kW (310 HP) | 254 kW (341 HP) | Turbocharged (T) |
| NTA855-G1-A | 240 kW (322 HP) | 264 kW (354 HP) | TC + Water-Air Aftercooler (TA) |
| NTA855-G1A | 264 kW (350 HP) | 291 kW (390 HP) | TC + Water-Air Aftercooler (TA) |
| NTA855-G2-A | 284 kW (380 HP) | 321 kW (430 HP) | TC + Water-Air Aftercooler (TA) |
| NTA855-G1B | 284 kW (380 HP) | 321 kW (430 HP) | TC + Water-Air Aftercooler (TA) |
| NTA855-G2A | 310 kW (415 HP) | 343 kW (460 HP) | TC + Water-Air Aftercooler (TA) |
| NTA855-G4 | 317 kW (425 HP) | 351 kW (471 HP) | TC + Water-Air Aftercooler (TA) |
| NTAA855-G7 | 343 kW (460 HP) | 377 kW (505 HP) | TC + Air-Air Charge Cooler (TAA) |
| NTAA855-G7A | ~370 kW | 407 kW (545 HP) | TC + Water-Air Aftercooler (TA) |
60 Hz Models (1800 RPM)
| Engine Model | Prime Power | Standby Power | Aspiration |
|---|---|---|---|
| NTA855-G1-B | 287 kW (386 HP) | 317 kW (425 HP) | TC + Water-Air Aftercooler (TA) |
| NTA855-G2-B | 313 kW (420 HP) | 347 kW (465 HP) | TC + Water-Air Aftercooler (TA) |
| NTA855-G3 | 358 kW (480 HP) | 399 kW (535 HP) | TC + Water-Air Aftercooler (TA) |
Core Specifications
| Parameter | Value |
|---|---|
| Engine Type | 4-cycle, inline 6-cylinder |
| Displacement | 14.0 L (855 cu in) |
| Bore × Stroke | 140 mm × 152 mm (5.5 in × 6.0 in) |
| Compression Ratio | 14.0:1 to 15.0:1 (model-dependent) |
| Firing Order | 1–5–3–6–2–4 |
| Fuel System | Cummins PT direct injection (mechanical) |
| Aspiration | Turbocharged; water-air or air-air aftercooled (TA/TAA) |
| Governor | Electronic (EFC), ±0.25% steady state |
| Prime Power Range (50 Hz) | 205–370 kW @ 1500 RPM |
| Prime Power Range (60 Hz) | 287–358 kW @ 1800 RPM |
| Dry Weight | 1,270–1,315 kg (~2,800–2,900 lb) |
| Wet Weight | ~1,350 kg (~2,970 lb) |
| Dimensions (L×W×H) | 1,534 × 781 × 1,355 mm |
| Lube Oil Capacity (total system) | 38.6 L (10.2 US gal) |
| Coolant Capacity (engine only) | 20.8 L (5.5 US gal) |
| Starting System | 24V, negative ground |
| Emission | Euro I / II (non-regulated) |
Key Engineering Features
Proven PT Fuel System
The Cummins Pressure-Time (PT) fuel injection system delivers injection pressures above 120 MPa with precise metering and timing. Low-pressure fuel supply means fewer lines, fewer leak points, and exceptional reliability in remote locations. The integral dual-flyweight governor provides independent overspeed protection.
Replaceable Wet Liners
Wet cylinder liners dissipate heat far better than dry liners and can be replaced without re-boring the block. This dramatically extends overhaul life and reduces rebuild cost — a major reason NTA855 engines remain in service for 20+ years.
Holset Turbo + Aftercooling
Holset HX-series turbochargers deliver high boost with excellent transient response. The TA models use jacket-water aftercooling; the TAA models (NTAA855-G7/G7A) use air-air charge cooling for maximum density and output up to 407 kW standby.
One Head Per Two Cylinders
The three-section cylinder head design (each covering two cylinders) provides structural rigidity, simplifies servicing, and reduces gasket failure risk. Four valves per cylinder optimize airflow for clean combustion and low BSFC.
Fuel Consumption
The NTA855 series delivers competitive fuel efficiency across its power range. The table below shows typical fuel consumption based on Cummins published performance data for the NTA855-G4 at 1500 RPM.
| Load | Power (kW) | Fuel Consumption (L/hr) | BSFC (g/kW·h) |
|---|---|---|---|
| Standby (100%) | 351 | ~84 | ~210 |
| Prime (100%) | 317 | ~76 | ~205 |
| Prime (75%) | 238 | ~57 | ~198 |
| Prime (50%) | 159 | ~39 | ~200 |
Actual fuel consumption varies by model, alternator efficiency, ambient conditions, and fuel quality. Lower-rated models like the NT855-G achieve ~198 g/kW·h at rated power. Contact us for a model-specific fuel map.
Genset Packaging & Alternator Pairing
NTA855 engines are the go-to choice for 250–500 kVA open, silent, and trailer-mounted generator sets. Common alternator and controller pairings include:
| Engine Model | Genset kVA (0.8 PF) | Typical Alternator | Controller Options |
|---|---|---|---|
| NT855-G / NT855-GA | 250–300 kVA | Stamford UCI274 / Marathon | DeepSea 7320, ComAp AMF25 |
| NTA855-G1-A / G1A | 300–330 kVA | Stamford UCI274 / HCI444 | DeepSea 7320, Harsen |
| NTA855-G2-A / G1B | 350 kVA | Stamford HCI444 / Leroy Somer | DeepSea 8610, ComAp InteliLite |
| NTA855-G2A / G4 | 380–400 kVA | Stamford HCI444 / PI144 | DeepSea 8610, ComAp AMF25 |
| NTAA855-G7 / G7A | 440–500 kVA | Stamford PI144 / PI160 | DeepSea 8610, ComAp InteliGen |
| NTA855-G3 (60 Hz) | ~450 kVA | Stamford PI144 / Marathon | DeepSea 8610, ComAp AMF25 |
Canopy noise levels typically reach 75 dBA at 7 meters with standard sound attenuation; super-silent enclosures can achieve 65–70 dBA for hospitals and residential areas. All sets comply with ISO 8528 G2/G3 steady-state speed regulation.
NTA855 vs MTA11 vs KTA19: Selection Guide
Choosing between CCEC’s three core G-Drive platforms depends on required kVA, duty cycle, and physical space.
| Feature | MTA11 | NTA855 | KTA19 |
|---|---|---|---|
| Displacement | 10.8 L | 14.0 L | 18.9 L |
| Cylinders | 6 inline | 6 inline | 6 inline |
| 50 Hz Prime Range | 224–282 kW | 205–370 kW | 328–575 kW |
| Genset kVA Range | 280–350 kVA | 250–500 kVA | 400–720 kVA |
| Dry Weight | ~940 kg | ~1,300 kg | ~1,750 kg |
| Overhaul Interval | ~12,000 hrs | ~15,000 hrs | ~18,000+ hrs |
| Best For | Compact 280–350 kVA sets | Broad 250–500 kVA range, proven workhorse | Heavy-load 400+ kVA, mining, data centers |
The NTA855 hits the sweet spot for most commercial and industrial generator applications — broad power coverage, massive global parts availability, and a proven track record spanning 30+ years. For requirements above 400 kVA continuous duty, the KTA19 series offers more displacement and longer overhaul intervals. For compact installations below 300 kVA, the MTA11 series is lighter and smaller.
Typical Applications
- Construction & mining — reliable prime power for crushers, conveyors, batch plants, and mining camps where grid power is unavailable.
- Commercial standby — hotels, shopping malls, office buildings, supermarkets, and banks requiring 250–500 kVA backup.
- Healthcare — hospitals and clinics with critical life-support systems; super-silent enclosures available for noise-sensitive environments.
- Data centers & telecom — BTS sites, edge data centers, and server rooms requiring dependable backup with EFC governor for tight frequency control.
- Rental fleets — trailer-mounted 300–500 kVA units for events, construction, disaster relief, and film production.
- Industrial prime power — factories, water treatment plants, cement works, and oil & gas operations in weak-grid or off-grid regions.
- Rural electrification — mini-grid and village power systems across Africa, Southeast Asia, the Middle East, and Latin America.
Maintenance & Service Intervals
| Service Item | Interval | Notes |
|---|---|---|
| Engine oil & filter | 250 hours / 6 months | API CF-4/SG or higher, 15W-40 |
| Fuel filter(s) | 250 hours | Fleetguard FF series; replace with oil service |
| Air filter | 500 hours / inspect 250 h | More frequent in dusty environments |
| Coolant / SCA check | 500 hours | Maintain DCA concentration; test with 3-way strip |
| Valve lash adjustment | 2,000 hours / 2 years | Cold setting per CCEC service manual |
| PT injector adjustment | 4,000–6,000 hours | Set injectors per CCEC PT procedure |
| Major overhaul | 15,000+ hours | Wet liners replaceable without block re-bore |
Genuine CCEC and Fleetguard replacement parts — including oil filters, fuel filters, PT injectors, turbochargers, water pumps, and gasket kits — are available through our Cummins engine parts center.
Frequently Asked Questions
What does “TA” and “TAA” mean in NTA855 model names?
T means turbocharged only. TA means turbocharged with a water-air (jacket-water) aftercooler. TAA means turbocharged with an air-air charge cooler. Air-air intercooling provides denser intake charge and higher output — the NTAA855-G7A reaches 407 kW standby from the same 14 L block. All NTA855 models except the NT855-G and NT855-GA use aftercooling.
What genset kVA does the NTA855-G2A produce?
The NTA855-G2A is rated at 310 kW prime (415 HP) and 343 kW standby (460 HP) at 1500 RPM. At 0.8 power factor, this translates to approximately 350 kVA prime and 380 kVA standby. It is one of the most popular ratings and commonly paired with Stamford HCI444 alternators.
Is the NTA855 fuel system mechanical or electronic?
The NTA855 uses the mechanical Cummins PT (Pressure-Time) fuel injection system — no ECU or common rail. The governor is typically an EFC (Electronic Fuel Control) electronic governor mounted on the PT pump, providing ±0.25% steady-state speed regulation for ISO 8528 G2/G3 compliance. This mechanical platform is preferred in remote areas where electronic diagnostics are unavailable.
How much fuel does an NTA855 generator consume?
At 100% prime load, BSFC is approximately 198–210 g/kW·h depending on the model. For an NTA855-G4 at 317 kW, this is roughly 76 L/hr at full load, 57 L/hr at 75% load, and 39 L/hr at 50% load. The lower-rated NT855-G achieves ~198 g/kW·h at its 205 kW rating.
What is the difference between NTA855-G1B and NTA855-G2-A?
Both produce 284 kW prime at 1500 RPM with water-air aftercooling, but they use different build configurations (SO numbers) and performance curves. The G1B uses configuration D093517DX02 with curve C-819E and 14.0:1 compression; the G2-A uses the same configuration but curve C-807E. They are often interchangeable for the same 350 kVA genset rating.
What is the lead time for an NTA855 generator engine?
Bare engines typically ship within 15–30 working days. Complete open or silent generator sets require 25–45 days depending on alternator brand, controller, canopy, and destination. We ship worldwide by sea (FOB/CIF/DAP) and can arrange air freight for urgent orders.
Official Resources
Genuine Cummins parts and service information: parts.cummins.com
