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Cadillac Unveils New A Twin-Turbo 3.6L V6 For The 2014 CTS
William Maley posted an article in Cadillac
By William Maley Staff Writer - CheersandGears.com March 18, 2013 The new Cadillac CTS will be introduced next week at the New York Auto Show, but the brand decided to announce the engine lineup for it this week. The big news for the CTS is the introduction of the twin-turbo 3.6-liter V6 good for 420 horsepower and 430 pound-feet. That is mated to an eight-speed automatic transmission. This combination runs to 60 MPH in 4.6 seconds, a top speed of 170 MPH, and returns an estimated MPG of 17 City/25 Highway. “The new Cadillac Twin-Turbo brings a new dimension of technologically advanced performance to the all-new 2014 Cadillac CTS sedan,” said David Leone, executive chief engineer. “Delivering power and sophistication, it marks another large step forward in the product-driven expansion of Cadillac.” This engine will also be available in the 2014 XTS. Other engines for the 2014 CTS will include the 2.0L turbo-four making 272 horsepower and 295 pound-feet of torque, and the 3.6L V6 with 321 horsepower and 275 pound-feet of torque. Source: Cadillac William Maley is a staff writer for Cheers & Gears. He can be reached at [email protected] you can follow him on twitter at @realmudmonster. Press Release is on Page 2 Cadillac Twin-Turbo Debuts in All-New 2014 CTS Sedan 2013-03-18 420 horsepower (313 kW) / 430 lb-ft of torque (583 Nm) – SAE certified Most power-dense six-cylinder in segment at 118 hp/liter Cadillac’s first twin-turbo engine and eight-speed automatic transmission DETROIT – Cadillac today announced details of a new Twin-Turbo V-6 engine and eight-speed transmission – firsts for the brand and signature features of the all-new 2014 Cadillac CTS midsize luxury sedan debuting next week at the New York Auto Show. The Cadillac Twin-Turbo V-6 is the most power-dense six-cylinder engine in the midsize luxury segment – a 3.6L with 118 horsepower per liter (88 kW/liter) – and the eight-speed automatic enhances fuel economy and acceleration over a six-speed automatic. “The new Cadillac Twin-Turbo brings a new dimension of technologically advanced performance to the all-new 2014 Cadillac CTS sedan,” said David Leone, executive chief engineer. “Delivering power and sophistication, it marks another large step forward in the product-driven expansion of Cadillac.” Rated at an SAE-certified 420 horsepower (313 kW) and 430 lb.-ft. of torque (583 Nm), it is the most powerful V-6 ever from General Motors. It also has 15 percent greater power density than BMW 535i’s turbocharged 3.0L six, which is rated at 300 horsepower (223 kW), for a ratio of 100 horsepower per liter (74 kW/liter) – and even the BMW 550i’s TwinPower 4.4L V-8, rated at 400 horsepower (298 kW), or 91 horsepower per liter (68 kW/liter). Power density is a measure of efficiency for an engine’s size. A pair of smaller turbochargers and an efficient charge air cooler help provide more immediate power delivery. Additionally, approximately 90 percent of the 3.6L Twin-Turbo’s peak torque is available from 2,500 rpm to 5,500 rpm, giving the engine a broad torque curve that customers will feel as strong, willing power in almost all driving conditions, such as accelerating or overtaking traffic on the highway. Those features help the new CTS sedan reach 60 mph from a standstill in an estimated 4.6 seconds and achieve an estimated top speed of 170 mph (274 kph). The new Cadillac Twin-Turbo will expand the performance envelope of the upcoming 2014 CTS midsize luxury sedan, launching this fall in the United States. The engine will also will be offered in the 2014 XTS large luxury sedan this fall. The new engine is a comprehensive upgrade on the 60-degree, 3.6L DOHC V-6 offered in today’s SRX, XTS and ATS. However, almost every component is unique. New features include: All-new cylinder block casting All-new cylinder head castings Strengthened connecting rods Machined, domed aluminum pistons with top steel ring carrier for greater strength 10.2:1 compression ratio Patented, integrated charge air cooler system with low-volume air ducts Two turbochargers produce more than 12 pounds of boost (80 kPa) Vacuum-actuated wastegates with electronic control valves All-new direct injection fuel system Tuned air inlet and outlet resonators, aluminum cam covers and other features that contribute to exceptional quietness and smoothness. The 2014 CTS sedan will also feature the naturally aspirated 3.6L V-6 rated at 321 horsepower, as well as a 2.0L turbocharged engine rated at an estimated 272 horsepower. Proven foundation, new features Because the Cadillac Twin-Turbo is based on the same architecture as the existing naturally aspirated 3.6L V-6, it benefits from many proven technologies including dual-overhead camshafts, variable valve timing and direct injection. Key features also include: A durable forged steel crankshaft that contributes to greater high-rpm smoothness A friction-reducing polymer coating on the piston skirts, as well as fully floating wrist pins that help reduce friction Pressure-actuated oil squirters drench the underside of each piston and the surrounding cylinder wall with an extra layer of cooling, friction-reducing oil A cast aluminum oil pan is stiffer to improve powertrain rigidity and reduce vehicle vibration. It bolts to the transmission bell housing as well as the engine block, eliminating points of vibration. The cylinder block casting is unique to the turbocharged engine with cast-in provisions for turbocharger coolant and oil connections, as well as positive crankcase ventilation passages. It uses nodular iron main bearing caps for greater strength to manage the higher cylinder pressures that come with turbocharging. The cylinder heads are also unique to the Cadillac Twin-Turbo. They feature a high-tumble intake port design that enhances the motion of the air charge for a more-efficient burn when it is mixed with the direct-injected fuel and ignited in the combustion chamber. The topology of the pistons, which feature centrally located dishes to direct the fuel spray from the injectors, is an integral design element of the chamber design, as the piston heads become part of the combustion chamber with direct injection. “The high-tumble heads were developed with advanced modeling programs that helped us determine the optimal design in less time and with less trial and error,” said Richard Bartlett, assistant chief engineer for the 3.6L engine. “Literally hundreds of simulations were performed to optimize the port flow, injector spray angle and pattern, and piston topology to produce a highly efficient yet powerful combustion chamber.” Large, 38.3-mm intake valves and 30.6-mm sodium-filled exhaust valves enable the engine to process tremendous airflow. In some conditions, the continuously variable valve timing system enables overlap conditions – when the intake and exhaust valves in a combustion chamber are briefly open at the same time – to promote airflow scavenging that helps spool the turbochargers quicker for faster boost production. 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. As with the naturally aspirated 3.6L, the heads feature integral exhaust manifolds, although upper and lower water jackets were added to the heads to provide uniform temperature distribution and optimal heat rejection. On top of the heads, new aluminum cam covers enhance quietness and are designed with greater positive crankcase ventilation volume to support the turbo system. Integrated charge air cooling Another unique feature of the Cadillac Twin-Turbo is its efficient manner of processing the pressurized air charge through the cylinder heads and into the combustion chambers. 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 fosters more immediate torque response, for a greater feeling of power on demand, and reduces complexity by eliminating the need for a pair of throttle bodies. Using a pair of smaller turbochargers rather than a single, larger turbo also helps ensure immediate performance, because smaller turbochargers spool up – achieve boost-producing turbine speed – quicker to generate horsepower-building air pressure that is fed into the engine. The Cadillac Twin-Turbo’s integrated charge air cooling system also contributes to its immediate 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. In fact, 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 turbos to the throttle body,” said Bartlett. “The compressors draw their air directly from the inlet box and send their pressurized air through the intercooler basically immediately, giving the new CTS a tremendous feeling of power on demand.” The charge-cooling heat exchangers lower the air charge temperature by more than 130 degrees F (74 C), packing the combustion chambers with cooler, denser air for greater power. The twin-brick configuration of the heat exchangers is similar in design and function to the 6.2L supercharged “LSA” engine used on the current CTS-V Series. “The LSA engine showed us the efficiencies of mounting the intercooler on top of the engine, especially when it came to packaging and maintaining a short, unobstructed path for the air charge,” said Bartlett. “It’s efficient and effective – and we wanted to build on that experience.” The air cooler system achieves more than 80 percent cooling efficiency with only about 1 psi (7 kPa) flow restriction at peak power, for fast torque production. Vacuum-activated wastegates Unique vacuum-actuated wastegates – one per turbocharger – and electronic vacuum-actuated recirculation valves are used with the 3.6L Twin-Turbo for better management of the engine’s boost pressure and subsequent torque response for smoother, more consistent performance across the rpm band. A wastegate is used to regulate the boost pressure of the engine. It provides a method to bypass the exhaust flow from the turbo’s turbine wheel, which can be reintroduced into the exhaust stream – via a bypass tube – to maintain optimal turbine speed across the rpm band. Conventional wastegates are pressure-activated, allowing control of the actuator. The Cadillac Twin-Turbo’s vacuum-activated wastegate valves provide more consistent boost control, particularly at lower rpm, to enhance low-rpm torque, for a greater feeling of power at low speeds. 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 the 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. In addition to the vacuum-actuated wastegates and recirculation valves, the engine employs dual mass air flow sensors and an integral inlet air temperature/humidity sensor, a dual-compressor inlet pressure sensor and dual manifold pressure sensors. Eight speeds, no waiting The Cadillac Twin-Turbo is paired with a high-performance, paddle-shift eight-speed automatic transmission that offers efficiency and performance advantages over a six-speed transmission – including 1.5-percent greater fuel economy. The new paddle-shift eight-speed delivers smooth, quick shift performance – as quick as 0.3-second on wide-open-throttle upshifts – with the quietness, smoothness and refinement Cadillac customers expect. Smaller gear steps – closer ratios – support world-class performance, with quicker, more imperceptible shifting. The wide, 6.71 gear spread of the transmission enables the CTS to deliver strong performance at all rpm levels, while achieving good fuel economy on the highway. A “tall,” 0.69-ratio eighth-gear also helps maintain a low engine speed of approximately 1,800 rpm at 70 mph – about 200 rpm lower than a six-speed – which not only enhances efficiency but contributes to a quieter driving experience. Complete electronic control of the transmission enables it to select the best gear for the driving conditions, allowing the transmission to “skip” one or more gears, if appropriate, when up-shifting or down-shifting. In manual mode, torque converter lockup is used in gears two through eight to balance performance and efficiency, while preserving the maximum torque multiplication in first gear for optimal launch performance The CTS development team tailored the transmission for the high torque output of Cadillac 3.6L Twin-Turbo, which included stronger gear sets and a greater number of clutch plates. The team also wove in driver-selectable performance features enable the transmission to hold lower gears during certain performance-driving situations, for a more connected and responsive driving experience with the new turbocharged engine. Paddle-shift control enables the driver manual control of the gear changes, for the ultimate feeling of control of the turbocharged CTS.- 132 comments
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By William Maley Staff Writer - CheersandGears.com March 18, 2013 The new Cadillac CTS will be introduced next week at the New York Auto Show, but the brand decided to announce the engine lineup for it this week. The big news for the CTS is the introduction of the twin-turbo 3.6-liter V6 good for 420 horsepower and 430 pound-feet. That is mated to an eight-speed automatic transmission. This combination runs to 60 MPH in 4.6 seconds, a top speed of 170 MPH, and returns an estimated MPG of 17 City/25 Highway. “The new Cadillac Twin-Turbo brings a new dimension of technologically advanced performance to the all-new 2014 Cadillac CTS sedan,” said David Leone, executive chief engineer. “Delivering power and sophistication, it marks another large step forward in the product-driven expansion of Cadillac.” This engine will also be available in the 2014 XTS. Other engines for the 2014 CTS will include the 2.0L turbo-four making 272 horsepower and 295 pound-feet of torque, and the 3.6L V6 with 321 horsepower and 275 pound-feet of torque. Source: Cadillac William Maley is a staff writer for Cheers & Gears. He can be reached at [email protected] you can follow him on twitter at @realmudmonster. Press Release is on Page 2 Cadillac Twin-Turbo Debuts in All-New 2014 CTS Sedan 2013-03-18 420 horsepower (313 kW) / 430 lb-ft of torque (583 Nm) – SAE certified Most power-dense six-cylinder in segment at 118 hp/liter Cadillac’s first twin-turbo engine and eight-speed automatic transmission DETROIT – Cadillac today announced details of a new Twin-Turbo V-6 engine and eight-speed transmission – firsts for the brand and signature features of the all-new 2014 Cadillac CTS midsize luxury sedan debuting next week at the New York Auto Show. The Cadillac Twin-Turbo V-6 is the most power-dense six-cylinder engine in the midsize luxury segment – a 3.6L with 118 horsepower per liter (88 kW/liter) – and the eight-speed automatic enhances fuel economy and acceleration over a six-speed automatic. “The new Cadillac Twin-Turbo brings a new dimension of technologically advanced performance to the all-new 2014 Cadillac CTS sedan,” said David Leone, executive chief engineer. “Delivering power and sophistication, it marks another large step forward in the product-driven expansion of Cadillac.” Rated at an SAE-certified 420 horsepower (313 kW) and 430 lb.-ft. of torque (583 Nm), it is the most powerful V-6 ever from General Motors. It also has 15 percent greater power density than BMW 535i’s turbocharged 3.0L six, which is rated at 300 horsepower (223 kW), for a ratio of 100 horsepower per liter (74 kW/liter) – and even the BMW 550i’s TwinPower 4.4L V-8, rated at 400 horsepower (298 kW), or 91 horsepower per liter (68 kW/liter). Power density is a measure of efficiency for an engine’s size. A pair of smaller turbochargers and an efficient charge air cooler help provide more immediate power delivery. Additionally, approximately 90 percent of the 3.6L Twin-Turbo’s peak torque is available from 2,500 rpm to 5,500 rpm, giving the engine a broad torque curve that customers will feel as strong, willing power in almost all driving conditions, such as accelerating or overtaking traffic on the highway. Those features help the new CTS sedan reach 60 mph from a standstill in an estimated 4.6 seconds and achieve an estimated top speed of 170 mph (274 kph). The new Cadillac Twin-Turbo will expand the performance envelope of the upcoming 2014 CTS midsize luxury sedan, launching this fall in the United States. The engine will also will be offered in the 2014 XTS large luxury sedan this fall. The new engine is a comprehensive upgrade on the 60-degree, 3.6L DOHC V-6 offered in today’s SRX, XTS and ATS. However, almost every component is unique. New features include: All-new cylinder block casting All-new cylinder head castings Strengthened connecting rods Machined, domed aluminum pistons with top steel ring carrier for greater strength 10.2:1 compression ratio Patented, integrated charge air cooler system with low-volume air ducts Two turbochargers produce more than 12 pounds of boost (80 kPa) Vacuum-actuated wastegates with electronic control valves All-new direct injection fuel system Tuned air inlet and outlet resonators, aluminum cam covers and other features that contribute to exceptional quietness and smoothness. The 2014 CTS sedan will also feature the naturally aspirated 3.6L V-6 rated at 321 horsepower, as well as a 2.0L turbocharged engine rated at an estimated 272 horsepower. Proven foundation, new features Because the Cadillac Twin-Turbo is based on the same architecture as the existing naturally aspirated 3.6L V-6, it benefits from many proven technologies including dual-overhead camshafts, variable valve timing and direct injection. Key features also include: A durable forged steel crankshaft that contributes to greater high-rpm smoothness A friction-reducing polymer coating on the piston skirts, as well as fully floating wrist pins that help reduce friction Pressure-actuated oil squirters drench the underside of each piston and the surrounding cylinder wall with an extra layer of cooling, friction-reducing oil A cast aluminum oil pan is stiffer to improve powertrain rigidity and reduce vehicle vibration. It bolts to the transmission bell housing as well as the engine block, eliminating points of vibration. The cylinder block casting is unique to the turbocharged engine with cast-in provisions for turbocharger coolant and oil connections, as well as positive crankcase ventilation passages. It uses nodular iron main bearing caps for greater strength to manage the higher cylinder pressures that come with turbocharging. The cylinder heads are also unique to the Cadillac Twin-Turbo. They feature a high-tumble intake port design that enhances the motion of the air charge for a more-efficient burn when it is mixed with the direct-injected fuel and ignited in the combustion chamber. The topology of the pistons, which feature centrally located dishes to direct the fuel spray from the injectors, is an integral design element of the chamber design, as the piston heads become part of the combustion chamber with direct injection. “The high-tumble heads were developed with advanced modeling programs that helped us determine the optimal design in less time and with less trial and error,” said Richard Bartlett, assistant chief engineer for the 3.6L engine. “Literally hundreds of simulations were performed to optimize the port flow, injector spray angle and pattern, and piston topology to produce a highly efficient yet powerful combustion chamber.” Large, 38.3-mm intake valves and 30.6-mm sodium-filled exhaust valves enable the engine to process tremendous airflow. In some conditions, the continuously variable valve timing system enables overlap conditions – when the intake and exhaust valves in a combustion chamber are briefly open at the same time – to promote airflow scavenging that helps spool the turbochargers quicker for faster boost production. 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. As with the naturally aspirated 3.6L, the heads feature integral exhaust manifolds, although upper and lower water jackets were added to the heads to provide uniform temperature distribution and optimal heat rejection. On top of the heads, new aluminum cam covers enhance quietness and are designed with greater positive crankcase ventilation volume to support the turbo system. Integrated charge air cooling Another unique feature of the Cadillac Twin-Turbo is its efficient manner of processing the pressurized air charge through the cylinder heads and into the combustion chambers. 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 fosters more immediate torque response, for a greater feeling of power on demand, and reduces complexity by eliminating the need for a pair of throttle bodies. Using a pair of smaller turbochargers rather than a single, larger turbo also helps ensure immediate performance, because smaller turbochargers spool up – achieve boost-producing turbine speed – quicker to generate horsepower-building air pressure that is fed into the engine. The Cadillac Twin-Turbo’s integrated charge air cooling system also contributes to its immediate 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. In fact, 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 turbos to the throttle body,” said Bartlett. “The compressors draw their air directly from the inlet box and send their pressurized air through the intercooler basically immediately, giving the new CTS a tremendous feeling of power on demand.” The charge-cooling heat exchangers lower the air charge temperature by more than 130 degrees F (74 C), packing the combustion chambers with cooler, denser air for greater power. The twin-brick configuration of the heat exchangers is similar in design and function to the 6.2L supercharged “LSA” engine used on the current CTS-V Series. “The LSA engine showed us the efficiencies of mounting the intercooler on top of the engine, especially when it came to packaging and maintaining a short, unobstructed path for the air charge,” said Bartlett. “It’s efficient and effective – and we wanted to build on that experience.” The air cooler system achieves more than 80 percent cooling efficiency with only about 1 psi (7 kPa) flow restriction at peak power, for fast torque production. Vacuum-activated wastegates Unique vacuum-actuated wastegates – one per turbocharger – and electronic vacuum-actuated recirculation valves are used with the 3.6L Twin-Turbo for better management of the engine’s boost pressure and subsequent torque response for smoother, more consistent performance across the rpm band. A wastegate is used to regulate the boost pressure of the engine. It provides a method to bypass the exhaust flow from the turbo’s turbine wheel, which can be reintroduced into the exhaust stream – via a bypass tube – to maintain optimal turbine speed across the rpm band. Conventional wastegates are pressure-activated, allowing control of the actuator. The Cadillac Twin-Turbo’s vacuum-activated wastegate valves provide more consistent boost control, particularly at lower rpm, to enhance low-rpm torque, for a greater feeling of power at low speeds. 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 the 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. In addition to the vacuum-actuated wastegates and recirculation valves, the engine employs dual mass air flow sensors and an integral inlet air temperature/humidity sensor, a dual-compressor inlet pressure sensor and dual manifold pressure sensors. Eight speeds, no waiting The Cadillac Twin-Turbo is paired with a high-performance, paddle-shift eight-speed automatic transmission that offers efficiency and performance advantages over a six-speed transmission – including 1.5-percent greater fuel economy. The new paddle-shift eight-speed delivers smooth, quick shift performance – as quick as 0.3-second on wide-open-throttle upshifts – with the quietness, smoothness and refinement Cadillac customers expect. Smaller gear steps – closer ratios – support world-class performance, with quicker, more imperceptible shifting. The wide, 6.71 gear spread of the transmission enables the CTS to deliver strong performance at all rpm levels, while achieving good fuel economy on the highway. A “tall,” 0.69-ratio eighth-gear also helps maintain a low engine speed of approximately 1,800 rpm at 70 mph – about 200 rpm lower than a six-speed – which not only enhances efficiency but contributes to a quieter driving experience. Complete electronic control of the transmission enables it to select the best gear for the driving conditions, allowing the transmission to “skip” one or more gears, if appropriate, when up-shifting or down-shifting. In manual mode, torque converter lockup is used in gears two through eight to balance performance and efficiency, while preserving the maximum torque multiplication in first gear for optimal launch performance The CTS development team tailored the transmission for the high torque output of Cadillac 3.6L Twin-Turbo, which included stronger gear sets and a greater number of clutch plates. The team also wove in driver-selectable performance features enable the transmission to hold lower gears during certain performance-driving situations, for a more connected and responsive driving experience with the new turbocharged engine. Paddle-shift control enables the driver manual control of the gear changes, for the ultimate feeling of control of the turbocharged CTS. View full article
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William Maley Staff Writer - CheersandGears.com December 21, 2012 The folks at Camaro5.org got their hands on General Motors service document on decoding VIN number on 2014 model year vehicles for dealers and found some interesting information. First is the 2014 Camaro which features a listing of the 7.0L LS7 V8 engine from the current Corvette Z06 (505 horsepower and 470 lb-ft of torque). Speculation has it being for a new Camaro model, the rumored Z28 model. Next, the document references a LF3 engine which is noted as "ENGINE GAS, 6 CYL, 3.6L, SIDI, DOHC, VVT, ALUM, TWIN TURBO". In plain English, it could be the long rumored 3.6L twin-turbo V6. The document doesn't list the 3.6L twin-turbo in any of the models. Other items the document notes is the 2014 Buick Verano looks be dropping its base 2.4L four-cylinder and going towards a 1.6L turbo-four. The 2.0L turbo model will stick around. Source: Camaro5.org William Maley is a staff writer for Cheers & Gears. He can be reached at [email protected] or you can follow him on twitter at @realmudmonster. View full article
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William Maley Staff Writer - CheersandGears.com December 21, 2012 The folks at Camaro5.org got their hands on General Motors service document on decoding VIN number on 2014 model year vehicles for dealers and found some interesting information. First is the 2014 Camaro which features a listing of the 7.0L LS7 V8 engine from the current Corvette Z06 (505 horsepower and 470 lb-ft of torque). Speculation has it being for a new Camaro model, the rumored Z28 model. Next, the document references a LF3 engine which is noted as "ENGINE GAS, 6 CYL, 3.6L, SIDI, DOHC, VVT, ALUM, TWIN TURBO". In plain English, it could be the long rumored 3.6L twin-turbo V6. The document doesn't list the 3.6L twin-turbo in any of the models. Other items the document notes is the 2014 Buick Verano looks be dropping its base 2.4L four-cylinder and going towards a 1.6L turbo-four. The 2.0L turbo model will stick around. Source: Camaro5.org William Maley is a staff writer for Cheers & Gears. He can be reached at [email protected] or you can follow him on twitter at @realmudmonster.
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