G8.3 Gas Compression Applications

Power 99 - 190 hp
74 - 142 kW


Oil and Gas Engines Gas Compression


Wellhead compression and artificial lift applications require reliability and durability not found in every small natural gas engine. For dependable operations and world class support, you need the Cummins G8.3 – a high-performance natural gas engine that shares the proven heritage of the Cummins C Series diesel engines and many of the same heavy-duty components. You can depend on the G8.3 to keep maintenance costs down and the gas flowing. Every day.

General Specifications
Inline 6-Cylinder, 4-Cycle, Natural Gas

Bore 4.49 in (114 mm)
Stroke 5.32 in (135 mm)
Displacement 8.3 L (505 cubic in)
Engine Power* 99-190 hp (74-142 kW)
Compression ratio NA: 10.5:1, TA: 8:5:1
Aspiration Naturally aspirated or turbocharged and aftercooled
Exhaust Type Dry or watercooled manifold
Weight** 1650 lb (748 kg)
Lube oil capacity 8.5 gal (32.0 L)
Rotation Counterclockwise

* Rating dependent
** Weight is approximate and varies with options.

Model Rating

Compression Ratio


135 hp (101 kW) @ 2200 rpm




118 hp (88 kW) @ 1800 rpm




99 hp (74 kW) @ 1800 rpm




99 hp (74 kW) @ 1500 rpm



(1) CUSTOMER-COMPLIANT UPGRADEABLE – This engine is capable of operating with a Three-Way Catalyst at this rating. It is the responsibility of the owner/operator to upgrade the engine with an air/fuel ratio controller and a Three Way Catalyst capable of meeting the SI NSPS regulations. The owner/operator is required to conduct site compliance testing and submit documentation per the EPA SI NSPS requirements.

Designed for the oil and gas market, the G8.3 delivers exceptional dependability and low cost of operation.

Base Engine – Most major components, including block, crank, cam, gears and liners are common with the proven C series diesel.

Emissions – The G8.3 has catalyst ratings available to allow the engine to be operated as a rich burn engine and can be customer equipped with an AFR and catalyst to meet NSPS emissions requirements.

Air Handling – Naturally aspirated design delivers reliable performance and life.

Fuel System – Impco carburetor provides stable operation and fuel tracking through all load ranges.

Speed Control – Adjustable governor provides precise and stable rpm control under all load conditions.

Ignition System – Altronic CD1 integral electronic ignition system. Easily accessible spark plug location and single coil per cylinder for lower maintenance costs.

Lubrication System – High-capacity oil pan and combination full-flow and bypass oil filter reduces maintenance costs and extend service intervals.

Warranty – Cummins one year, unlimited hours. Backed by a worldwide distributor network.

Standard Equipment

Air Inlet System

  • Factory installed heavy duty air cleaner

Cooling System

  • Gear driven jacket water pump
  • Thermostat controlled jacket water circuit
  • Coolant filter for added corrosion protection
  • Auxiliary coolant pump optional for compressor cooling

Exhaust System

  • Tuned dry manifold for optimal exhaust flow

Fuel System

  • Impco carburetor
  • Maxitrol regulator

Speed Control System

  • Belt-driven mechanical governor
  • Electronic governor optional

Ignition System

  • Altronic CD1 integral electronic ignition system
  • Altronic III Shield ignition optional

Lube Oil System

  • Crankcase breather
  • High capacity oil pan for extended oil drain intervals
  • Combination full flow and bypass oil filter

Safety Shutoff Protection

  • Electronic fuel valve

Mounting Arrangement

  • Four point mounting
  • Lift provisions on engine

Flywheels and Flywheel Housings

  • Flywheel housing – SAE #3 Cast-iron, machined to accommodate starter mounting
  • Flywheel SAE # 3
  • SAE #2 and SAE #1 FW/FH options available

Electrical System

  • 24-volt alternator

Starting System

  • 24-volt starter
  • Gas starter optional

Power Take-Off

  • Front crankshaft pulley
  • Front stub shaft optional

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