The GM L3B engine is a

turbocharged In an internal combustion engine, a turbocharger (often called a turbo) is a forced induction device that is powered by the flow of exhaust gases. It uses this energy to compress the intake gas, forcing more air into the engine in order to pro ...

four-cylinder gasoline engine designed by General Motors. Production takes place at GM's

Spring Hill Manufacturing Spring Hill Manufacturing is a General Motors factory in Spring Hill, Tennessee. The plant currently includes vehicle assembly ( Cadillac Lyriq, Cadillac XT5, Cadillac XT6, and GMC Acadia) as well as powertrain, stamping and molding operations. T ...

. In addition to GM's

active fuel management Active Fuel Management (formerly known as displacement on demand (DoD)) is a trademarked name for the automobile variable displacement technology from General Motors. It allows a V6 or V8 engine to "turn off" half of the cylinders under light-lo ...

start-stop system A vehicle start-stop system or stop-start system automatically shuts down and restarts the internal combustion engine to reduce the amount of time the engine spends idling, thereby reducing fuel consumption and emissions. This is most advanta ...

, and

variable valve timing In internal combustion engines, variable valve timing (VVT) is the process of altering the timing of a valve lift event, and is often used to improve performance, fuel economy or emissions. It is increasingly being used in combination with varia ...

, which are already featured on GM's other full-size pickup truck engines, this engine also features GM's Intake Valve Lift Control which has 3 different intake cam profiles that are electromagnetically actuated to provide the best fuel economy and performance at a wider range of operating conditions. The engine is the first GM truck engine to feature an active thermal management system. This system consists of an electrically driven water pump and a 3-way rotary valve which allows the engine to maintain proper operating temperatures and quicker warm-ups. Also, a continuously variable oil pump helps to lower parasitic losses as well as providing proper lubrication and cooling to the engine, especially under high-load conditions. The

BorgWarner BorgWarner Inc. is an American automotive supplier headquartered in Auburn Hills, Michigan. The company maintains production facilities and technical systems at 93 sites (as of June 6, 2022) in 22 countries worldwide and has around 49,000 emplo ...

developed turbo can produce up to of boost thanks in part to its unique dual volute turbine housing and an electrically actuated wastegate. Instead of two side-by-side exhaust passages like on a regular

twin-scroll turbocharger In an internal combustion engine, a turbocharger (often called a turbo) is a forced induction device that is powered by the flow of exhaust gases. It uses this energy to compress the intake gas, forcing more air into the engine in order to pro ...

, in this design the two exhaust passages are concentric and allow for better use of the exhaust pulse energy.

History

The L3B was first used in the Chevrolet Silverado and GMC Sierra, with an output of at 5600 RPM and at 1500 RPM. With the unveiling of the 2022 model year Silverado, GM announced a significant revision that stiffened and strengthened the engine allowing for a GM-estimated increased maximum torque rating of while also improving

noise, vibration, and harshness Noise, vibration, and harshness (NVH), also known as noise and vibration (N&V), is the study and modification of the noise and vibration characteristics of vehicles, particularly cars and trucks. While noise and vibration can be readily measured, ...

(NVH).

Applications

References

{{reflist General Motors engines Straight-four engines Gasoline engines by model