Who Knew? – Cadillac introduces first ever twin-turbo V-8 engine. Applying loads of technology they have developed a small displacement 4.2L V-8 that produces a whopping 550 horsepower. Exclusive to Cadillac the all-new engine design is code designated LTA and will be the power plant for the new CT6. It is the first Dual Overhead Cam (DOHC) eight-cylinder engine from Cadillac and GM since the discontinued Northstar V8 in 2010.
The DOHC design should offer smoother operation over the “old school” push-rod engines and a new “Hot V” layout places the turbochargers in the valley at the top of the engine to eliminate turbo lag and reduce the engine’s overall size. The twin-scroll design of the turbochargers, each with electronically controlled wastegates precisely balance output allowing 90 percent of the engine’s 627 lb-ft of peak torque to be available at only 2000 rpm and carried through 5200 rpm.
To enhance engine performance twin intercoolers are used to cool the air temperature going into the engine by more than 130 degrees. Cooler air is denser allowing it to hold more oxygen allowing optimal combustion resulting in more power.
Some of the other specialized technology being used include: