Wellhead compression applications require reliability and durability not found in every natural gas engine. For dependable low emission operations and world class support, you need Cummins QSL9G – an emissions compliant, high-performance natural gas engine that shares the proven heritage of the Cummins C Series diesel engines and many of the same heavyduty components. You can depend on the QSL9G to stay emissions compliant, keep maintenance costs down and the gas flowing. Every day. General Specifications Inline 6-cylinder, 4-Cycle, Natural Gas Bore Engine Power* Compression Ratio Exhaust Type Coolant Capacity * Rating dependent ** Weight is approximate and varies with options. COMPLIANT CAPABLE – This engine is capable of meeting the SI NSPS regulations from the factory. However, the owner/operator is required to conduct site compliance testing and submit documentation per the EPA SI NSPS requirements. Engines with the “E” designation include a factory-supplied air/fuel ratio controller and a Cummins Emission Solutions Three-Way Catalyst. Features Designed for the oil and gas market, the QSL9G delivers exceptional dependability and low cost of operation. Base Engine – Most major components, including block, crank and liners are common with the proven L series diesel. Upgraded power cylinder for natural gas operation. Emissions – Rich burn combustion matched with a Cummins 3-way catalyst delivers NSPS compliant emissions down to 0.5 gr/hp hr NOx. Air/Fuel Ratio Control – Oxygen sensor-based air/fuel ratio controls emissions rate. Digital display shows O 2 , fuel control valve position, fault codes, other engine parameters and provides for user input. Air Handling – Turbocharged and aftercooled design delivers reliable performance up to 5,000 feet without derate. Fuel System – AFR control system provides stable operation through all load ranges. Speed Control – ECM based speed control with integrated throttle body provides precise and stable speed control under all load conditions. Ignition System – Cummins Ignition Module provides precision timing control and delivers proven reliable performance through all load conditions. Lubrication System – High-capacity oil pan and a larger, more efficient cooler reduce maintenance costs and extend service intervals. Commonality – All electronic Cummins gas compression engines utilize common AFR control components and strategy to minimize parts and maximize technician effectiveness. Warranty – Cummins one year, unlimited hours. Backed by a worldwide distributor network.

Rating Details. * Requires EPA site validation testing. Standard Equipment. ■ Factory installed heavy duty air cleaner Cooling System ■ Two pump / two loop cooling system ■ Belt driven jacket water pump ■ Gear driven auxiliary coolant pump ■ Coolant filter for added corrosion protection Thermostat controlled jacket water circuit Exhaust System ■ Wet manifold for improved turbo life Fuel System ■ Cummins proprietary air fuel ratio control with optimized control algorithm ■ Full authority Air Fuel Ratio (AFR) fuel control valve Speed Control System Digital Display ■ Engine fault codes with history...

Engine Technical Data. Model Curve Number Exhaust Type Aftercooler Water Inlet Temperature °F (°C) Compression Ratio Emissions Data – Catalyst Out Emissions (Catalyst Dependent) NOx BTU/hp-hr (MJ/kW-hr) BTU/hp-hr (MJ/kW-hr) Jacket Water Fuel Consumption Heat Rejection Exhaust System Flow Rate Stack Temp Max Back Pres. Flow Rate Intake System

General Dimensions. Length Width Height Dimensions* Inches (mm) 55 (1397) Inches (mm) 32.3 (819) Inches (mm) 52.9 (1343) * Dimensions are approximate and vary with options. (2) All data is based on the engine operating with fuel system, water pump, and 8 in H2O (1.99 kPa) inlet air restriction with 4 in (102 mm) inner diameter, and with 1 in Hg (3 kPa) exhaust restriction with 4 in (102 mm) inner diameter; not included are alternator, fan, optional equipment and driven components. Coolant flows and heat rejection data based on coolants as 50% ethylene glycol/50% water. All data is subject to...