General Motors is currently considering developing a new twin-turbocharged six-cylinder gasoline engine for its pickup trucks and SUVs. Although the decision to develop such an engine is far from finalized, such a configuration is currently on the table for future GM vehicle powertrains.
If GM does move ahead with the development of a new twin-turbo six for its trucks and SUVs, the powerplant would be similar to the turbocharged 2.7L I4 L3B gasoline engine currently in use in various GM vehicles. The new engine would follow GM’s Cylinder Set Strategy (CSS), which seeks to optimize engine development and production via economies of scale, although it bears mentioning that the The General’s CSS has been scaled down considerably since GM’s pivot towards all-electric vehicles and AV technology. It’s worth noting that the 2.7L I4 L3B, along with the 3.0L I6 LM2 turbodiesel Duramax, form the foundational elements of GM’s CSS.
At present, several of GM’s rivals have made the switch from big-displacement V8 gasoline engines to boosted six-cylinder units. A few examples would include Ford with its range of EcoBoost engines, as equipped in the F-150, Bronco, and Bronco Raptor, Stellantis (Ram) with its Hurricane engines, as equipped by the Wagoneer, and Toyota with its i-Force engine, as equipped by the Tundra.
|Configuration||Twin-Turbo V6||Twin-Turbo V6||Twin-Turbo V6||Twin-Turbo V6||Twin-Turbo V6||Twin-Turbo I6||Twin-Turbo I6||Twin-Turbo V6|
|Power (hp @ rpm)||325 @ 5,000||330 @ 5,500||418||400 @ 6,000||450 @ 5,850||420 @ 5,200||510 @ 5,700||389 @ 5,200|
|Torque (lb-ft @ rpm)||400 @ 3,000||415 @ 3,100||415||500 @ 3,100||510 @ 3,000||468 @ 3,500||500 @ 3,500||479 @ 2,400|
|Applications||Ford F-150||Ford Bronco||Ford Bronco Raptor||Ford F-150||Ford F-150 Raptor||Wagoneer L||Grand Wagoneer L||Toyota Tundra|
To note, the Ford EcoBoost 2.7L engine is also found in the Ford Edge ST and Lincoln Nautilus, while the EcoBoost 3.0L V6 is also found in the Ford Explorer ST and Lincoln Aviator. Meanwhile, the Ford EcoBoost 3.5L engine is also found in the Ford Expedition, Ford Transit, and Lincoln Navigator.
GM’s engine lineup, both past and present, already includes several twin-turbocharged V6 engines. A few modern examples include the 3.0L LGY, as equipped with the Cadillac CT5 and Cadillac CT5-V, as well as the 3.6L LF4, as equipped by the Cadillac CT4-V Blackwing and (previously) the Cadillac ATS-V. A few examples of this engine configuration from past GM vehicles include the 3.0L LGW, as found in the Cadillac CT6, and the 3.6L LF3, as found in the Cadillac CTS V-Sport and XTS V-Sport.
|Configuration||Twin-Turbo V6||Twin-Turbo V6||Twin-Turbo V6||Twin-Turbo V6||Twin-Turbo V6||Twin-Turbo V6|
|Power (hp @ rpm)||335 @ 5,400||360 @ 5,400||404 @ 5,700||420 @ 5,750||464 @ 5,850||472 @ 5,750|
|Torque (lb-ft @ rpm)||405 @ 2,350 to 4,000||405 @ 2,350 to 4,000||400 @ 2,500 to 5,100||430 @ 3,500 to 4,500||445 @ 3,500||445 @ 3,500|
|Applications||Cadillac CT5||Cadillac CT5-V||Cadillac CT6||Cadillac CTS V-Sport, XTS V-Sport||Cadillac ATS-V||Cadillac CT4-V Blackwing|
Another option currently under consideration is the continued development of GM’s Small Block V8 range. However, when the turbocharged 2.7L I4 L3B gasoline engine makes almost as much torque (430 pound-feet) as the flagship atmospheric 6.2L V8 L87 gasoline engine (460 pound-feet), the continued development of the naturally-breathing eight could be seen as a questionable move.
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