A twin-turbo V8 engine is about to be born from the beautiful engineers over at Cadillac.
For the longest time, GM didn’t let their brands make their own engines. Everything came off-the-shelf from one of the few engines that GM made, and each car was made to work with what they got.
Well, no longer. For the first time in decades, GM has allowed their luxury brand, Cadillac, to make their own engine.
The reason? Cadillac’s usual move is to take a 6.2-L V8 straight out of a Corvette and plop it into one of their cars (which is exactly what the did for the CTS-V). This is fine for sporty coupes that are designed to go fast, but for luxury sedans, it can be a bit of a problem. People want a smoothly accelerating engine in such cars rather than one that’ll push you into the back of your seats.
Cadillac’s solution to this problem was to make a 4.2-L twin-turbo V8 with an emphasis on steady torque delivery rather than maximum power. This allows the luxury sedan that the 4.2-L will eventually find its way into--the CT6 and CT6 V-Sport--to have a predictable response when you put your foot down.
“Designing an all-new engine was the best way to achieve the… refined and powerful character we were looking for,” Cadillac engineer Jordan Lee told Popular Mechanics. “The engine is biased toward torque versus peak power.”
Even with an emphasis on steady torque the engine will still make plenty of power. On the CT6, it’ll produce 500 hp and 553 lb-ft of torque, while on the CT6 V-Sport it’ll make 550 hp and 627 lb-ft of torque.
Just about 90% of that torque is available from 2,000 RPM all the way to 5,200 RPM, meaning you’ll have smooth, predictable power going up the on-ramp without needing to slam on the gas.
That’s not all. The new 4.2-L engine will also have cylinder deactivation, start-stop, and a hot-V turbo placement that minimizes turbo lag by placing the turbos as close as they can be to the exhaust manifold: right inside the valley and on top of the cylinder heads.
The new twin-turbo 4.2-L will be built alongside its bigger brother at the Corvette plant in Bowling Green, Kentucky.