Cummins · Cummins D6 Commercial Diesel

Cummins C1100 D6

1100 kW standby / 1000 kW prime · Diesel · Liquid-cooled

1100 kW diesel standby generator with QSK38 37.7L V-12 engine and MCRS fuel injection. EPA Tier 2 compliant, PowerCommand control, liquid-cooled, for data center, hospital, and mission-critical standby applications.

Cummins Cummins C1100 D6 generator — specifications and details
Standby power
1100 kW / 1000 kW prime
Voltage options
277/480V, 346/600V, 4160V, 12470V, 13800V
Frequency / Phase
60 Hz · 3-phase
Engine
Cummins QSK38 · 37.7L
EPA / Emissions
Tier 2
Data CentersHealthcareManufacturingCommercialparalleling-array
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Overview#

The Cummins C1100 D6 is an 1100 kW standby diesel generator set powered by the QSK38 -- a 37.7-liter, V-12 diesel engine with Cummins' Modular Common Rail System (MCRS) fuel injection. Rated at 1375 kVA standby and 1250 kVA prime at 60 Hz, the C1100 D6 delivers above-megawatt standby power for Tier III+ data centers, large hospital campuses, and mission-critical industrial facilities.

The QSK38 MCRS fuel system provides precise, electronically controlled injection timing and quantity for each of the 12 cylinders, enabling optimized combustion across the load range. The 2P2L (2-pump, 2-loop) cooling system separates jacket water from charge air cooling, providing superior thermal management during transient load events. The 40,000-hour major overhaul interval reflects the QSK38 platform's robust design and conservative power-to-displacement ratio at 1100 kW.

Medium-voltage options up to 13,800V and PowerCommand 2.3/3.3 paralleling controllers make the C1100 D6 suitable for multi-genset arrays in data centers and campus distribution applications. For sites requiring more power per unit, the C1250 D6 operates the same QSK38 engine at its full rated output.

Engineering specifications

Physical

Length
150 in
Width
78 in
Height
90 in
Dry weight
12,500 lb

Fuel system & runtime

Fuel use @ full load
77 GPH
Fuel use @ 75% load
57 GPH
Fuel use @ 50% load
40 GPH

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Estimate runtime for the Cummins C1100 D6

Adjust load percent and tank size to estimate runtime. Pre-filled with this model's spec where available.

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Estimated runtime

3.4 hours(0.1 days)

Fuel consumption ≈ 59.40 GPH at 75% load. Estimate based on industry-typical 1800 RPM standby curves (≈0.07 GPH/kW at full load). Actual consumption varies by engine, ambient temperature, fuel quality, and tuning.

Service intervals

Manufacturer-recommended intervals for the Cummins C1100 D6 under standby duty. Field intervals may differ based on load profile, ambient conditions, and fuel quality.

Oil & filter
Every 500 hours or 12 months
Air filter
Every 1000 hours
Fuel filter
Every 500 hours
Major overhaul
≈ 40,000 hours

Common failure modes

What we've seen fail on this platform. Use as a service-planning reference, not a diagnostic — actual failure modes depend heavily on duty cycle and maintenance history.

ComponentSymptomTypical hoursSeverity
MCRS fuel injection systemInjector fault codes, rough running, power imbalance between banks—moderate
Turbocharger(s)Reduced boost, excessive smoke, turbo bearing noise—moderate
2P2L cooling systemCoolant temperature exceedances, system pressure loss in either loop—severe
Fuel quality / tank degradationFilter clogging, hard starting, injector fouling from stagnant fuel—moderate
Starting system (24V battery bank)Slow crank, failed start requirement on infrequently exercised units—minor

Frequently Asked Questions

What engine does the Cummins C1100 D6 use?
The C1100 D6 uses the Cummins QSK38 -- a 37.7-liter, V-12 diesel engine with Modular Common Rail System (MCRS) fuel injection. The QSK38 is one of Cummins' flagship large-format diesel platforms, used across the 1100-1250 kW range.
What are the standby and prime ratings of the C1100 D6?
Standby rating is 1100 kW (1375 kVA) at 60 Hz, 0.8 power factor. Prime rating is 1000 kW (1250 kVA). Both at 1800 rpm, 60 Hz, three-phase.
What are the service intervals for the C1100 D6?
Oil and filter changes are due at 500 hours or 12 months. Air filter replacement at 1,000-hour intervals. Fuel filter at 500 hours. Coolant flush at 6,000 hours. Major overhaul interval is 40,000 hours under standard standby duty conditions.
How does the C1100 D6 compare to the C1250 D6?
Both use the QSK38 V-12 platform (37.7L). The C1100 D6 operates at a lower output calibration (1100 kW vs 1250 kW), providing more headroom and potentially better fuel economy under partial load. The C1250 D6 represents the top of the QSK38 power band.
What cooling system does the C1100 D6 use?
The C1100 D6 uses Cummins' 2P2L (2-pump, 2-loop) cooling system, which separates the jacket water circuit from the charge air cooling circuit. This provides more precise temperature control and reduces the risk of thermal cycling damage on high-load transient events.
Can OnPoint Generators service the C1100 D6 in Northern California?
Yes. OnPoint Generators provides authorized Cummins service for large diesel generators across the San Francisco Bay Area and Northern California. QSK38 service requires Cummins INSITE diagnostics for MCRS fuel system calibration, and attention to the 2P2L cooling system during maintenance.

Compatible equipment

Transfer switches

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