General Motors 2.7L Turbo I4 (L3B) Engine Specs
General Motors
General Motors 2.7L Turbo I4 (L3B) is a 2.7L (2727 cc) petrol engine with 237-325 HP, 351-583 Nm, 10:1 compression ratio. Typical service life: 300,000+.
Description
The GM L3B is a highly engineered 2.7-liter (166 cubic inch) turbocharged four-cylinder engine designed by General Motors. This aluminum, undersquare, DOHC inline-four configuration is specifically calibrated to deliver robust low-end torque.
Beyond the features shared with other GM pickup truck engines—including Active Fuel Management (AFM), Start-Stop technology, and Variable Valve Timing (VVT)—the L3B incorporates a sophisticated Intake Valve Lift Control system. This key technology utilizes three electromagnetically-actuated intake cam profiles to optimize both fuel efficiency and power across diverse driving conditions.
The powertrain's significant performance relies on a BorgWarner-developed turbocharger capable of generating up to 27 psi (1.9 bar) of boost. This high output is enabled by a unique design: the turbo uses a dual volute turbine housing where the two exhaust passages are concentrically arranged, unlike the side-by-side design of a conventional twin-scroll unit. This concentric architecture allows for maximum