Cadillac will introduce a new 3.0-liter V-6 with the upcoming luxury CT6 sedan, the firm announced Friday. The turbocharged unit is part of a new generation of V-6 engines that will eventually make it into various General Motors vehicles. Peak output for the twin-turbo V-6 that will debut in the CT6 model is estimated at 400 horsepower and 400 pound-feet of torque, making it one of the most power-dense V-6 engines on the market, at 133 horsepower per liter.

The engine isn’t just about horsepower and torque though. To help it save fuel, GM built it with both cylinder deactivation and stop/start features, making it the first six-cylinder engine to combine turbocharging and these fuel-saving technologies. Cadillac estimated the 3.0-liter will be six percent more efficient than GM’s turbo 3.6-liter V-6.

As usual, Cadillac went ahead and compare its new engine to similar powerplants offered by its German rivals. Specifically, Caddy says the 3.0-liter’s 133 horsepower per liter is 27 percent greater than the BMW 740Li’s 3.0L twin-turbo V-6 (rated at 315 horses) and 29 percent more than the Audi A7’s 3.0L supercharged V-6 (rated at 310 horses). What’s more, the firm claims its new engine will deliver "exceptional quietness and smoothness" and be up to 5 dB quieter than the Audi 3.0-liter TFSI engine.

In the CT6, the new powerplant will mate to GM’s Hydra-Matic 8L90, eight-speed automatic transmission. However, this combo won’t be the CT6’s based drivetrain, as Cadillac also wants a turbo-four in the sedan.

Continue reading to learn more about Cadillac’s new 3.0 Liter V-6 Twin Turbo Engine.

New 3.6-liter V-6

Cadillac Announces New 3.0-liter V-6 Turbo Engine Will Debut In CT6 Drivetrain
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GM’s new family of engines also includes a new version of the familiar 3.6-liter V-6. This unit replaced the powerplant that debuted in the 2004 Cadillac CTS and found its way into a number of GM vehicles, including the Chevrolet Malibu, GMC Acadia, Pontiac G8, and the Holden Commodore. The 3.6-liter shares many features with the turbo 3.0-liter, such as the aluminum block, four-cam phasing system, and oiling system. There’s no word as to which cars will get this unit, but I expect it to find its way into vehicles such as the Chevy Camaro, Cadillac CTS, Chevrolet Colorado, and the Buick LaCrosse.

Both of Cadillac’s new V-6 engines will be produced at GM’s Romulus Powertrain Operations assembly facility near Detroit. GM invested $540-million in it to build The General’s next-generation V-6 engines.

Why it matters

Although development of this new family engines began some years ago, the powerplants arrive just in time for Cadillac’s new business strategy, which will see the automaker enter new market segments. The CT6 is only the first step in Caddy’s new approach under Johan de Nysschen, with several new models to follow. Offering engines that are both powerful and full-efficient is also part of the strategy, and it seems as if the newly announced twin-turbo 3.0-liter and 3.6-liter V-6 powerplants are a great start to the brand’s new campaign against German premium imports.

2016 Cadillac CT6

2016 Cadillac CT6 Computer Renderings and Photoshop
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The Cadillac CT6 is set to become the company’s range-topping model; a large, luxurious sedan to take on Germany’s finest: the Mercedes Mercedes -Benz S-Class, BMW BMW 7 Series, and the Audi A8. Design-wise, the CT6 will be an evolutionary step in Cadillac’s current design language. Pricing is expected to start from around $80,000 and jump well into the $100,000 range with all the options checked.

Press Release

Cadillac today announced a new generation of V-6 engines, led by an exclusive Twin Turbo V-6 that will be one of the industry’s most advanced six-cylinder gasoline engines. It leverages the latest technology to balance efficiency, performance and refinement in the upcoming, top-of-the-range CT6 luxury performance sedan.

Cadillac Announces New 3.0-liter V-6 Turbo Engine Will Debut In CT6 Drivetrain
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The all-new Cadillac 3.0L Twin Turbo is designed to achieve new thresholds of refinement and specific output for the brand’s new prestige luxury sedan, which makes its world premiere March 31, at the New York International Auto Show. Production begins late this year at General Motors’ Detroit-Hamtramck Assembly Plant.

Peak output is estimated at 400 horsepower (298 kW) and 400 lb-ft of torque (543 Nm), making it one of the most power-dense V-6 DOHC engines in the world, developing 133 horsepower (99 kW) per liter.

The 3.0L Twin Turbo is the only six-cylinder engine to combine turbocharging with cylinder deactivation and stop/start technologies to conserve fuel. Cadillac expects the combination to enhance fuel economy by up to an estimated 6 percent. Cylinder deactivation temporarily deactivates two of the cylinders in light-load driving conditions to enhance efficiency and seamlessly reactivates them when the driver demands full power.

With the stop/start system, the 3.0L Twin Turbo is shut down in certain driving conditions such as stop-and-go city driving to reduce fuel consumption, automatically restarting when the driver takes his or her foot off the brake pedal.

“Cadillac’s elevation on the world stage is driven in great part by its advanced powertrain technology and the all-new 3.0L Twin Turbo powers past the traditional segment leaders with higher degrees of the performance and refinement their reputations were built on,” said Rich Bartlett, assistant chief engineer.

The highly-acclaimed Hydra-Matic 8L90 eight-speed automatic transmission transfers the 3.0L Twin Turbo’s power to the CT6.

Similar to the turbo system in the track-capable Cadillac ATS-V, the new 3.0L Twin Turbo features turbochargers with lightweight, low-inertia titanium-aluminide turbine wheels and an efficient, patented low-volume charge-air cooler, which contribute to optimal boost production and more immediate power delivery.

The advanced, low-inertia turbochargers enable the engine to sustain peak torque from 2,500 rpm to 5,000 rpm, giving it a broad torque curve that is conveyed to the driver through a feeling of responsive, sustained power across the entire rpm band.

Cadillac Announces New 3.0-liter V-6 Turbo Engine Will Debut In CT6 Drivetrain
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“Torque is the pulling power of an engine and the new 3.0L Twin Turbo delivers it with confidence-inspiring smoothness and progression,” said Bartlett. “In fact, the potency of the torque across the rpm band is matched only by the satisfaction of the horsepower created as those revs climb quickly to 6,500 rpm.”

The 3.0L Twin Turbo’s estimated 400 horsepower and 133 hp per liter is 27 percent greater than the BMW 740Li’s 3.0L twin-turbo V-6 (315 hp and 105 hp/L) and 29 percent more than the Audi A7’s 3.0L supercharged V-6 (310 hp and 103 hp/L).

All-new architecture

Cadillac’s new 3.0L Twin Turbo is part of a new generation of technologically advanced V-6 engines, which includes a new version of the award-winning 3.6L naturally aspirated engine employed for years across the brand’s model range. Each features all-new structural and combustion elements designed to complement higher performance and greater efficiency with exceptional quietness and smoothness.

The 3.0L Twin Turbo is up to 5 dB quieter than the Audi 3.0L TFSI engine, while the 3.6L is up to 4 dB quieter than the Infiniti 3.7L V-6.

Features shared by the 3.0L Twin Turbo and 3.6L include:

Stronger, stiffer aluminum block with increased structure in the bulkheads for superior rigidity
Tough, refined rotating assembly with a stiff forged-steel crankshaft, friction-reducing polymer-coated pistons and strong high-copper-content, sinter-forged connecting rods
New four-cam phasing system with intermediate park technology that enhances efficiency by enabling late inlet valve closing in certain conditions
All-new, patented “targeted” cooling system that provides strategic cooling of the engine’s hottest areas while simultaneously fostering faster warm-up, which enhances efficiency
New cylinder heads that enhance combustion performance and include direct injection and feature integrated exhaust manifolds
Revised, simplified timing drive system with cushioned chain sprockets contributing to quieter engine operation
All-new oiling system moves the pump inside the block for quieter operation. The two-stage oil pump also enhances efficiency.

“This new architecture leverages the best of Cadillac’s proven, awarded V-6 engine technology and takes it farther with a finer focus on refinement and durability to match its benchmark output and efficiency,” said Bartlett.

A more complete look at the architecture, features and attributes of the new V-6 family is available in the 3.6L release.

Unique foundation

While the 3.0L Twin Turbo is based on the same, all-new architecture as the naturally aspirated 3.6L V-6, it incorporates specific components and features to support the load and cylinder pressure characteristics unique to a forced-induction engine.

Its 86mm bore specification is about 10 percent smaller than the 3.6L, while both engines share an 85.8mm stroke. The smaller bore reduces the size and consequentially the weight of the pistons in the 3.0L Twin Turbo, making the most of the rotating assembly’s geometry to match the quicker rev capability enabled by the low-inertia turbochargers’ quick spool-up.

“With nearly zero turbo lag and a commensurately low-inertia rotating assembly, this engine climbs the rpm ladder and produces power on demand,” said Bartlett. “Its performance is more than just the maximum output – it’s how it is delivered and the new 3.0L Twin Turbo delivers it with smoothness and precision.”

The smaller bores also allow larger water jackets between the cylinders, which helps maintain optimal combustion temperatures across the rpm band and during sustained high-load, max-boost performance.

Additional features unique to the 3.0L Twin Turbo include:

Lower 9.8:1 compression ratio vs. 11.5:1 on the naturally aspirated 3.6L
Extreme duty 44MnSiV6 steel crankshaft forging
The pistons incorporate a specific steel insert in the top ring land to support the turbocharged engine’s higher cylinder pressures
Large, 36mm intake valves and 29mm sodium-filled exhaust valves enable the engine to process tremendous airflow
The valves are held at 19 degrees on the intake side and 16 degrees on the exhaust side vs. the 3.6L’s 18 degrees for the intake and 15 degrees for the exhaust
Valve spring pre-load tension is increased to manage the greater exhaust pressure during peak load performance
Hardened AR20 valve seat material on the exhaust side is used for its temperature robustness, while the heads are sealed to the block with multilayer-steel gaskets designed for the pressure of the turbocharging system
Tuned air inlet and outlet resonators, aluminum cam covers and other features contribute to exceptional quietness and smoothness.

Low-inertia turbochargers and vacuum-actuated wastegates

The twin, low-inertia turbochargers’ featherweight titanium-aluminide turbines are used with vacuum-actuated wastegate control for precise, responsive torque production. The titanium-aluminide turbines reduce rotating inertial load by more than 50 percent, compared with conventional Inconel turbine wheels. That means less exhaust energy – which spins the turbines – is wasted in stored inertial loads.

In practical terms, that means the relatively small size of the turbochargers and their lightweight turbines foster more immediate “spooling,” which practically eliminates lag, for an immediate feeling of power delivery. They produce up to 18 pounds of boost (125 kPa).

A single, centrally located throttle body atop the engine controls the air charge from both turbochargers after the temperature is reduced in the intercooler. This efficient design also contributes to more immediate torque response, while reducing complexity by eliminating the need for a pair of throttle bodies.

Unique vacuum-actuated wastegates – one per turbocharger – are used with the Twin Turbo for better management of the engine’s boost pressure and subsequent torque response for smoother, more consistent performance. They are independently controlled on each engine bank to balance the compressors’ output to achieve more precise boost pressure response.

The wastegates also work in concert with vacuum-actuated recirculation valves to eliminate co-surge from the turbos – a condition that can result in dynamic flow reversal, such as the moment immediately after the throttle closes. This overall system integration contributes to the engine’s smoother, more consistent feeling of performance.

Cadillac Announces New 3.0-liter V-6 Turbo Engine Will Debut In CT6 Drivetrain
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Patented low-volume charge-air cooling

Cadillac’s patented, manifold-integrated water-to-air charge cooling system also contributes to more immediate torque response, because the compressors blow through very short pipes up to the intercooler.

With no circuitous heat-exchanger tubing, there is essentially no lag with the response of the turbochargers. Airflow routing volume is reduced by 60 percent when compared with a conventional design that features a remotely mounted heat exchanger.

“It is a very short path from the compressors to the intake ports,” said Bartlett. “The compressors draw their air directly from the inlet box and send their pressurized air through the intercooler immediately for a tremendous feeling of power on demand.”

The charge-cooling heat exchangers lower the air charge temperature by more than 200 degrees F (94 C), packing the combustion chambers with cooler, denser air for greater power. Also, the air cooler system achieves more than 80 percent cooling efficiency with only about 1 psi (7 kPa) flow restriction at peak power, which contributes to fast torque production.


Both of Cadillac’s new V-6 engines will be produced at GM’s Romulus Powertrain Operations assembly facility, near Detroit, which received a $540-million investment to build the next-generation V-6 engines.

FAST FACT: In 1903, the first production Cadillac motor cars were equipped with a single-cylinder engine rated at 10 hp.

Cadillac has been a leading luxury auto brand since 1902. Today Cadillac is growing globally, driven by an expanding product portfolio featuring dramatic design and technology. More information on Cadillac appears at Cadillac’s media website with information, images and video can be found at

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