03-20-2015, 03:02 PM | #1 |
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GM Reveals Twin Turbocharged LGW 3.0L V6 and 3.6L LGX V6 engines
Cadillac Next-Gen V-6 Engines Led by 3.0L Twin Turbo
Segment-leading power, efficiency in world’s most advanced six-cylinder General Motors 2015-03-20 DETROIT – 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. 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. “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:
“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:
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. 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. Manufacturing 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. All-New, Advanced 3.6L V-6 to Drive Cadillac CT6 Next-gen engine sets efficiency, refinement and durability benchmarks General Motors 2015-03-20 DETROIT – An all-new 3.6L V-6 engine debuts in the 2016 Cadillac CT6, setting benchmarks for efficiency, refinement and durability in the brand’s range-topping large luxury performance sedan. The clean-sheet engine design is the fourth generation of GM’s acclaimed DOHC V-6 engine family and incorporates new features, including Active Fuel Management (cylinder deactivation) and stop/start technology to enhance fuel economy up to a General Motors’-estimated 9 percent when compared to the previous engine. Noise-reducing features, including an all-new cam drive system, contribute to the new 3.6L being up to 4 dB quieter at idle and under low load driving conditions than the benchmark Infiniti 3.7L V-6. It also advances performance and fuel economy-optimizing technologies introduced on previous generations, including direct injection and continuously variable valve timing. Output is SAE certified at 335 horsepower (250 kW) and 284 lb-ft of torque (385 Nm). “This new 3.6L V-6 raises the bar for all naturally aspirated V-6 engines in the industry and perfectly augments the CT6’s new standard for sophistication,” said Ameer Haider, assistant chief engineer for V-6 engines. “It builds on the established strengths of previous Cadillac engines, pushing the technologies to new heights and introducing new ones that take performance, refinement and efficiency to benchmark levels.” GM’s Active Fuel Management system temporarily deactivates two of the 3.6L’s cylinders in light-load driving conditions to enhance fuel efficiency and seamlessly reactivates them when the driver demands full power. With an efficiency-enhancing stop/start system, the engine 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. Additional engine highlights include:
“The new 3.6L is designed to deliver peak performance, efficiency and refinement with maximum durability – and minimal maintenance,” said Haider. “Those attributes put it at the forefront of naturally aspirated V-6 engine offered in any luxury car around the world.” An all-new Hydra-Matic 8L45 paddle-shift eight-speed automatic transmission is paired with the new 3.6L V-6 in the CT6, elevating the CT6’s driving experience with one of the luxury market’s smoothest, quietest and most efficient powertrain combinations. In addition to the CT6, the 2016 Cadillac ATS and CTS will offer the all-new 3.6L, where they are expected to lead their respective segments in fuel economy and non-boosted V-6 power. Also, a new 3.0L twin-turbocharged engine based on the same architecture will be offered on the CT6. Stronger, quieter foundation Structurally, the all-new 3.6L V-6 is similar to the proven, award-winning design of the previous V-6 engines, including an aluminum, deep-skirt cylinder block. The optimal 60-degree cylinder angle is retained, with the bore size enlarged from 94mm to 95mm and the bore centers stretched from 103mm to 106mm. The cylinder block features six-bolt main bearing caps and inter-bay breather vents that enhance power and oil flow management. A larger crankshaft bore diameter and wider bearing cap bulkheads in the block provide higher main bearing load-carrying capability. The block also accommodates larger, 12mm cylinder head bolts to provide greater clamping strength for the engine’s higher output. The crankshaft is forged from 1538MV steel and inherently stiffer than a conventional cast-iron crankshaft, contributing significantly to the engine’s smoothness, quietness and durability. Attached to the crankshaft are high-strength connecting rods and pistons. The rods are sinter-forged and composed of a high-copper alloy that stands up to high heat and resists bending, while the polymer-coated hypereutectic pistons are designed to minimize friction, allowing for a tighter piston-to-bore clearance that results in quieter operation. The new 3.6L V-6 also incorporates oil-spray piston cooling, which helps reduce noise, lower combustion temperatures and enhance durability by drenching the underside of each piston and the surrounding cylinder wall in an extra layer of cooling, friction-reducing engine oil. Continuously variable valve timing with intermediate park feature Camshaft phasing allows the greatest variances in valve timing to make the most of power and efficiency. The new 3.6L V-6 engine takes that technology to the next level with intermediate park technology for the intake camshaft phasers. Because optimal part-load efficiency requires retarding the intake cams to reduce pumping losses, the effect also reduces the effective compression ratio, which affects the engine’s cold-start performance. Conventional cam phasing system authority is limited by how far the intake cams can be retarded in the parked position without affecting cold starting. Intermediate park technology, which incorporates an intermediate-lock intake variable valve timing cam phaser, allows the cams to be parked at the most favorable position for cold starting, while expanding the amount of intake cam retard for other conditions by adding another 20 degrees of intake phaser authority. This enhances fuel efficiency and reduces emissions. Targeted cooling system Unlike conventional systems, which force coolant flow from the front of the block to the back, the new 3.6L’s patented targeted cooling system sends coolant simultaneously to each water jacket in the heads and block. This new, parallel-flow design maximizes heat extraction in the area of the upper deck, intake and exhaust valve bridges in the heads and integrated exhaust manifold with a minimal amount of coolant. The result is more even and consistent cooling, which enhances performance, and faster engine warmup, which improves cold-start efficiency and reduces emissions. Additionally, the strategic sizing of the coolant jackets in the head and the block reduces the cooling system thermal inertia, allowing the use of a smaller water pump, which requires about 50 percent less power to drive, enhancing fuel efficiency and even allowing a lower overall height of the cylinder block. New cylinder head design An all-new cylinder head design builds on the airflow attributes of the current V-6, supporting a broader power band that ensures excellent low-rpm torque, for strong power at take-off, and excellent airflow at high-rpm, for greater horsepower. Engineers achieved that through increased in-cylinder mixture motion, a faster burn rate of the air-fuel mixture and attributes that took full advantage of the new intermediate park cam phasing system. Highlights include:
An integrated exhaust manifold rounds out the head’s features, saving weight over a conventional, separate head/manifold assembly. Direct injection and Active Fuel Management The all-new 3.6L V-6 continues to employ direct fuel injection to make the most of efficiency and performance. Along with the placement of the fuel injector in the combustion chamber, the piston top is carefully shaped to promote a through mix of the air and fuel, and direct the fuel spray to ensure a more complete combustion. A higher-capacity engine-driven fuel pump supports the higher output of the new engine and contributes better fuel atomization, which enhances performance, and reduced emissions. Active Fuel Management, also known as cylinder deactivation, imperceptibly shuts down the No. 2 and No. 5 cylinders in certain light-load driving conditions to save fuel. Refinement and durability A number of new and enhanced features are designed to make the all-new 3.6L V-6 one of the industry’s quietest, smoothest and most durable engines:
Manufacturing The new Cadillac 3.6L V-6 engine will be produced, along with the new 3.0L Twin Turbo engine, at GM’s Romulus Powertrain Operations assembly facility, near Detroit, which received a $540-million investment to build the next-generation V-6 engines.
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03-20-2015, 03:02 PM | #2 |
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Since one of these engines is supposed to make it to the 6th gen I thought I'd post this here too.
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03-20-2015, 03:25 PM | #3 |
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Thx for posting Fen! Looks like there is a new 8spd just for the V6s. Good sign the Camaro will get an 8spd for the V6 too. Maybe the 2.0T will get a 6spd auto.
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03-20-2015, 04:13 PM | #4 |
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Awesome!! YES!!
This is what I've been wanting to read about for so long now...the 3.6 LGX. I was hoping for 340/290 but I'll take 335/284 without much gripe. Simple intake and exhaust modifications will have this engine at 350HP without much issue. Who knows how far it could go with a tune and other bolt-ons. Also...it appears the V6 will get the new 8 speed as well....ANOTHER WIN!!! 335HP/8 speed auto, in a lighter V6 will be awesome. I'll admit...I'm kind of hoping they disable the start/stop in the Camaro, or at least make the program so that it stays off if you are in sport/manual mode. I'm also very impressed with the new TT3.0...I wasn't expecting numbers to be so quite that high. Love it. If they offered it in the next Camaro as an optional engine (but below V8) I'd take it for sure. Thanks for posting!
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03-20-2015, 04:25 PM | #5 |
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I would think the 6th gen is going to get the 8speed auto as well as the twinturbo 3.0 and for certain the 3.6l
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03-20-2015, 04:26 PM | #6 |
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I wonder when they put the LGX in the camaro if they would give it a slight power bump?
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03-20-2015, 04:28 PM | #7 | |
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Quote:
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03-20-2015, 04:50 PM | #8 | |
Hail to the King baby!
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Quote:
Remember, Cadillac is striving for unique powertrains. Although I expect this new V6 to be the new V6 across the board, you should think the Camaro gets a bump. If you want more than that......................buy the V8.
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03-20-2015, 05:12 PM | #9 | |
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Quote:
If the T4 is supposed to be the base engine, that means the LGX would have to compete with the EcoBoost Mustang and it makes more torque but slightly less power.
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03-20-2015, 05:14 PM | #10 | |
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Didn't the Camaro V6's have a few more HP than the Cadillac's for both the LLT and LFX? |
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03-20-2015, 05:16 PM | #11 | |
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Any possibility the TT3.0 becomes the base engine in the Gen 6 Camaro? |
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03-20-2015, 05:19 PM | #12 | |
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Quote:
Maybe the LGX, TT3.0, LT1 and LT4 but, as far as I know, the TTV6s not cheap engines and are heavy so it would be roughly the weight and cost of the LT1 but down on power and torque.
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03-20-2015, 05:20 PM | #13 | |
Hail to the King baby!
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Quote:
For the US, you would likely see the LT1 as the engine of choice at 400+ HP simply (and luckily for us) because the TT V6 would be more expensive.
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03-20-2015, 05:40 PM | #14 | |
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Quote:
Could it be offered at some point as a mid-range Camaro engine? Not impossible, IMO. Great to finally get the details on the LGX. Sounds like a very nice mill. I'll be anxious to try one out. |
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