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Cadillac to introduce first-ever twin-turbo V-8 engine

Cadillac CT6 V-Sport 4.2L Twin Turbo V-8 (Photo: GM Media)

Cadillac has introduced its first twin-turbo V-8 engine as it begins a new chapter in the brand's high-performance legacy. The engine will power the 2019 CT6 V-Sport which Cadillac describes as an engaging sports sedan infused with the DNA of the brand's world-renowned motorsports program.

The 4.2L Twin Turbo V-8 will be exclusive to Cadillac and pack an estimated 550 horsepower and 627 lb-ft of torque, elevating the CT6's performance to a new level.

“Cadillac’s performance technology reaches new heights with the new and exclusive 4.2L Twin Turbo V-8,” said Cadillac President Johan de Nysschen. “The engineering prowess embodies the very spirit of Cadillac performance on and off the racetrack.”

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The new engine introduces unique design elements developed to balance performance and efficieny with compact, mass-efficient packaging.

“Designing an all-new engine was the best way to achieve the performance goals for the CT6 V-Sport,” said Jordan Lee, 4.2L TT V-8 chief engineer. “It builds on Cadillac’s well-established turbocharging know-how and forges new ground with innovative features that deliver exceptional performance and refinement.”

According to GM, in a conventional turbocharged engine, the cylinder heads receive the pressurized air charge through ports at the top of the engine and the exhaust exits through ports on the lower outside of the heads into manifolds connected to the turbochargers.

With Cadillac’s innovative hot V design, the intake-charged air enters through the lower outside of the heads and exits through the top inside — where the turbochargers are integrated with the exhaust manifolds — for quick spool-up that translates into more immediate power delivery. The design also allows closer mounting of the catalytic converters, for efficient packaging.

Other highlights include twin-scroll turbochargers, twin water-to-air charge coolers and direct injection. The engine also will have GM's Active Fuel Management cylinder deactivation system and start/stop technology, two fuel saving features.

Each engine will be hand-built at GM's Performance Build Center in Bowling Green, Kentucky.

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