Cadillac Introduces First-Ever Twin-Turbo V-8 Engine
Sophisticated, all-new 4.2L Twin Turbo V-8 is during a heart of new CT6 V-Sport’s model performance
Cadillac starts a new section in a high-performance bequest with today’s introduction of a brand’s first-ever twin-turbo V-8 engine. It is a centrepiece of a new CT6 V-Sport, an enchanting sports sedan infused with DNA of Cadillac’s world-renowned motorsports program.
Developed as a small-displacement V-8 in a classical capillary and charity well-developed energy firmness of 131 hp (98 kW) per litre, this new Cadillac-exclusive 4.2L Twin Turbo V-8 — GM estimated during 550 horsepower (410 kW) and 627 lb-ft of torque (850 Nm) — elevates a CT6’s opening to a new plateau and offers drivers an forlorn knowledge behind a wheel. An discretionary 500-horsepower chronicle will also be available.
“Cadillac’s opening record reaches new heights with a new and disdainful 4.2L Twin Turbo V-8,” pronounced Cadillac President Johan de Nysschen. “The innovations that harmonise it consolidate a really spirt of Cadillac opening on and off a racetrack.”
The new Cadillac Twin Turbo V-8 is a clean-sheet pattern that also introduces singular pattern elements grown to change opening and potency with compact, mass-efficient packaging.
“Designing an all-new engine was a best approach to grasp a opening goals for a CT6 V-Sport,” pronounced Jordan Lee, 4.2L TT V-8 arch engineer. “It builds on Cadillac’s timeless turbocharging expertise and forges new belligerent with innovative facilities that broach well-developed opening and refinement.”
At a centre of a 4.2L Twin Turbo V-8 is a “hot V” pattern that transposes a required blueprint of a cylinder heads’ intake and empty systems to mountain a turbochargers during a tip of a engine — in a hollow between a heads — to probably discharge turbo loiter and revoke a engine’s altogether wrapping size.
In a required turbocharged engine, a cylinder heads accept a pressurized atmosphere assign by ports during a tip of a engine and a empty exits by ports on a revoke outward of a heads into manifolds connected to a turbochargers.
With Cadillac’s innovative prohibited V design, a intake-charged atmosphere enters by a revoke outward of a heads and exits by a tip inside — where a turbochargers are integrated with a empty manifolds — for discerning spool-up that translates into some-more evident energy delivery. The pattern also allows closer ascent of a catalytic converters, for fit packaging.
Additional engine highlights:
- Twin-scroll turbochargers
- Electronic wastegate control
- Twin water-to-air assign coolers
- Twin stifle bodies
- Direct injection
- Dual-independent camshaft phasing
- Active Fuel Management (cylinder deactivation)
- Variable-pressure oiling system
- Stop/start technology
Each engine will be hand-built during a Performance Build Center in Bowling Green, Kentucky.
SMALL DISPLACEMENT, LARGE EFFECT
The new Cadillac Twin Turbo V-f8’s substructure is an all-new, durable and lightweight aluminum cylinder retard that houses an equally robust, lightweight rotating public stoical of a fake steel crankshaft, fake steel joining rods and high-strength aluminum pistons.
The crankshaft’s 90.2mm (3.55 inch) cadence complements a cylinder bores’ 86mm (3.39 inch) hole to give a engine a 4.2L (255 cubic-inch) displacement.
Its partially tiny gimlet dimension enables a rebate in a distance and weight of a pistons, optimizing a engine’s geometry to compare a fast-rev capability accessible by a engine’s low-inertia, twin-scroll turbochargers. The outcome is well-developed responsiveness and immediacy of energy opposite a rpm band.
The turbochargers furnish adult to 20 pounds of boost (1.38 bar) and are matched with electronic wastegate control for some-more accurate boost government and some-more manageable torque production. In fact, 90 percent of a engine’s rise torque is accessible during usually 2000 rpm, and it is carried by 5200 rpm for a confident, probably unfounded energy reserve.
The turbos’ twin-scroll pattern broadens their opening capability, charity quicker response and larger efficiency. Rather than a singular turn cover (scroll) feeding empty gas from a empty plural to expostulate a turbine on any turbocharger, a twin-scroll pattern has a divided housing with twin empty gas inlets and twin nozzles to expostulate a turbine. Generally, one of a nozzles contributes to quicker response and boost production, while a other contributes to altogether rise performance.
Each of a engine’s integrated empty manifolds/turbocharger housings splits a empty channels from a cylinder conduct so a empty flows by apart scrolls formed on a engine’s empty pulses. When matched with accurate valve timing, that subdivision leverages exhaust-scavenging techniques to optimize gas flow, improves turbine potency and reduces turbo lag.
The electronically tranquil wastegates — one per turbocharger — are used for some-more accurate government of a engine’s boost vigour and successive torque response for smoother, some-more unchanging performance. They are exclusively tranquil on any cylinder bank to change a turbo compressors’ output, for larger boost vigour response.
WATER-TO-AIR CHARGE COOLING AND DUAL THROTTLE BODIES
An fit water-to-air charge-cooling complement contributes to a engine’s performance, enhancing a turbochargers’ effectiveness. Similar in judgment to an engine’s radiator, a system’s intercoolers cold a increased atmosphere assign before it enters a cylinders. Cooler atmosphere is denser, that means there is some-more oxygen in a given volume, ensuing in optimal explosion and some-more power.
The complement facilities a span of feverishness exchangers located above a valley-mounted empty manifold/turbocharger housings. The turbos siphon pressurized atmosphere directly by a feverishness exchangers and into a cylinder heads. The feverishness exchangers are cooled by their possess coolant circuit.
The intercoolers revoke a atmosphere assign heat by some-more than 130 degrees F (74 C), make-up a explosion chambers with cooler, denser air. Also, a complement achieves some-more than 80 percent cooling potency with usually about 1 psi (7 kPa) upsurge limitation during rise power, that contributes to quick torque production.
Before entering a explosion chambers, a cooled atmosphere assign flows by a span of stifle bodies, one for any engine bank. Each electronically tranquil stifle physique has a 59mm hole opening.
NEW 10-SPEED TRANSMISSION
The new Cadillac Twin Turbo V-8 is matched with a 10-speed involuntary transmission. Its wide, 7.39 altogether rigging ratio widespread enhances off-the-line opening and contributes to reduced engine speed on a highway, that enhances excellence and efficiency. Smaller stairs between a gears also assistance a engine say a optimal speed for limit energy during roughly all car speeds.
Direct fuel injection is used to optimize potency and performance. With approach injection, a aloft application ratio — 9.8:1 — is probable given of a cooling outcome as a injected fuel vaporizes in a explosion chamber, shortening a assign heat to relieve a odds of hint knock. A span of engine-mounted, camshaft-driven high-pressure fuel pumps reserve fuel to a specialized injectors during 5,075 psi (350 bar), with any siphon provision fuel to one bank of a engine.
Active Fuel Management (AFM), also famous as cylinder deactivation, undiscernibly shuts down half of a engine’s cylinders in certain light-load pushing conditions to raise fuel economy. Unique deactivating rocker arms are used for any of a 4 valves of a cylinder being deactivated.
Dual beyond camshafts and a probably wordless chain-driven valvetrain minister to a fibre and a high outlay of a Cadillac Twin Turbo V-8, while twin eccentric invariably non-static valve timing helps broach optimal opening and efficiency. The twin eccentric system, that allows a intake and empty valves to be phased during opposite rates, promotes linear fibre of torque with near-peak levels over a extended rpm range, and high specific outlay (horsepower per litre of displacement) but sacrificing altogether engine response or drivability.
Oil jets located in a retard are employed for opening and heat control. Four jet assemblies in a engine suffuse a underside of a pistons and a surrounding cylinder walls with an additional covering of cooling, friction-reducing oil. The jets revoke piston temperature, permitting a engine to furnish some-more energy but shortening long-term durability.
Variable-pressure oiling system. A variable-displacement vane oil siphon enhances potency by optimizing oil vigour as a duty of engine speed. With it, a oil supply is matched to a engine bucket rather than a linear operation of a conventional, fixed-flow oil pump. The engine uses 10 quarts of General Motors’ dexos2 0W40 engine oil.
Stop/start technology shuts down a engine when a car stops momentarily, such as during stoplights. The engine automatically restarts when a motorist takes their feet off a brake. An auxiliary battery powers electric accessories such as a meridian system, energy windows and radio during engine restarts.
About Cadillac in Canada
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