GM L3B engine

{{One source|date=August 2022}}

{{Infobox engine

| name = General Motors L3B engine

| image =

| manufacturer = General Motors

| aka =

| production = 2018–present

| predecessor =

| successor =

| configuration = Inline-4

| displacement = {{convert|2727|cc|L CID|1|order=flip|abbr=on}}

| bore = {{convert|92.25|mm|in|abbr=on|2}}

| stroke = {{convert|102|mm|in|abbr=on|2}}

| cylinder spacing = {{convert|??.??|mm|in|abbr=on|2}}

| block = 380 T5 Cast Aluminum

| head = 356 T5 Cast Aluminum

| valvetrain = DOHC 4 valves/cyl with VVT and VVL

| compression = 10.0:1

| turbocharger = Single BorgWarner Dual-Volute w/ electrically actuated wastegate

| fuelsystem = Gasoline direct injection

| management =

| fueltype = Gasoline

| oilsystem = Wet sump

| coolingsystem = Water cooled

| idle =

| redline = 6100 RPM

| power = {{convert|237-325|hp|kW|abbr=on|0}}

| specpower =

| torque = {{convert|259-430|lbft|Nm|abbr=on|0}}

| length =

| width =

| sp = us

| weight =

| emissions level = Tier III, Bin 50

| emissions control =Three-way catalytic converter, wide-band heated oxygen sensor

}}

The GM L3B engine is a turbocharged four-cylinder gasoline engine designed by General Motors. It is an undersquare aluminum DOHC inline-four displacing 2.7 liters (166 cid) and tuned for strong low-end torque.

In addition to GM's active fuel management, start-stop system, and variable valve timing, 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 improved fuel economy and performance at a wider range of operating conditions.{{cite web|last1=Sherman|first1=Don|title=All-new four-cylinder for 2019 Chevrolet Silverado|url=https://www.sae.org/news/2018/05/gm-2.7-l-i-4-revealed|website=www.sae.org|publisher=SAE.org|accessdate=28 May 2018|language=en}}

The BorgWarner developed turbo can produce up to {{convert|27|psi|bar|abbr=on}} 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 this design the two exhaust passages are concentric and allow for better use of the exhaust pulse energy.