All-new 2.7L Turbo Enhances Versatility of a 2019 Silverado

Posted on 19. May, 2018 by in GM Canada

All-new 2.7L Turbo Enhances Versatility of a 2019 Silverado

Technological powerhouse delivers opening and efficiency






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DETROIT (Friday, May 18, 2018) — The 2019 Chevrolet Silverado 1500 will be offering with an all-new, technologically modernized 2.7L Turbo that expands a operation of accessible engines  and builds on additional choices to assistance business find a Silverado that ideally suits their needs.

Standard on LT and RST trims, a new engine delivers an SAE-certified 310 horsepower and 348 lb.-ft. of torque, for 22 percent some-more torque than a 4.3L V-6 it replaces. Developed privately for lorry applications, a new 2.7L Turbo inline four-cylinder engine delivers rise torque from 1,500 to 4,000 rpm.

The next-gen Silverado with a 2.7L Turbo delivers 0-60 mph opening in reduction than 7 seconds and weighs 380 pounds reduction than a stream Silverado with a 4.3L V-6. Compared with rival full-size trucks, a Silverado 2.7L Turbo is approaching to broach allied towing and cargo capability with larger torque and fuel potency than a 3.3L V-6 in a Ford F-150 XLT and a 3.6L V-6 in a Ram 1500 Big Horn.

“The new 2.7L Turbo is a technological marvel, with a many modernized valvetrain,” pronounced Tom Sutter, arch operative for a 2.7L Turbo. “With a broad, prosaic torque bend and discerning stifle response, it punches above a weight, delivering startling opening and efficiency.”

The cornerstone of a 2.7L Turbo is an innovative double-overhead-cam valvetrain that enables:

  • Chevrolet’s initial use of Active Fuel Management (cylinder deactivation) on a turbocharged engine
  • High- and low-lift valve profiles
  • Continuously non-static valve timing

Additional engine technologies ancillary a engine’s opening and potency include:

  • Dual-volute turbocharger housing, for softened stifle response and low-speed torque.
  • Chevrolet’s initial focus of Active Thermal Management, that uses targeted engine heating and cooling to urge engine opening in prohibited and cold ambient temperatures.
  • An integrated empty plural that is partial of a cylinder conduct public and recovers empty feverishness for faster engine and fibre warmup, with quicker turbo response.
  • Stop/start record that automatically stops a engine in stop-and-go trade for fuel efficiency.
  • An electric H2O siphon that eliminates a drag of a conventional, engine-driven siphon to raise efficiency. It also enables continual cabin heating even when a engine is close off by a stop/start feature.

Designed as a lorry engine

The new 2.7L Turbo engine represents a clean-sheet pattern for Chevrolet and was grown from a opening as a lorry engine.

To assistance beget a strong, low-end torque business pattern in a truck, it was designed with a prolonged piston cadence of 102 millimetres (4.01 inches), that is a stretch a piston travels adult and down within a cylinder.

The prolonged cadence enables softened explosion and so a aloft application ratio. Typically, a prolonged cadence can boost a bucket of a pistons opposite a cylinder walls, generating some-more friction. That’s alleviated in a 2.7L Turbo with an equivalent crankshaft. It is somewhat off-center from a cylinders, permitting a some-more honest position for a joining rods during their movement.

To support a high cylinder pressures that come with turbocharging, a crankshaft is done of fake steel, and a pistons are done of a tough aluminum amalgamate with a expel iron ring slit insert.

All elements of a 2.7L Turbo were designed for a final of turbocharged opening in a lorry environment; a engine was subjected to a same severe continuance standards as a Silverado’s proven V-8 engines.

The 2.7L Turbo facilities an aluminum retard and cylinder conduct for reduced mass.

Unique valvetrain offers some-more accurate control

The 2.7L Turbo’s valvetrain is GM’s initial to incorporate non-static lift, generation and Active Fuel Management to optimize opening and potency opposite a rpm band. It is a pivotal reason a engine’s rise torque is accessible during usually 1,500 rpm.

The system’s electro-mechanical, non-static camshaft effectively allows a engine to work with 3 opposite camshaft profiles, complementing a non-static valve timing complement to broach optimized handling modes for opposite engine speeds and loads:  

  1. High valve lift for full power
  2. Low valve lift for change of energy and efficiency
  3. Active Fuel Management shuts down twin of a cylinders in light bucket conditions to serve preserve fuel

“It’s like carrying opposite engines for low-, and high-rpm performance,” pronounced Sutter. “The camshaft form and valve timing is totally opposite during low and high speeds, for glorious opening opposite a board.”

The camshaft pattern alters a lift of a intake and empty valves. As a engine bucket changes, electromagnetic actuators concede a mobile missile containing opposite cam lobes to change undiscernibly between high-lift and low-lift profiles.

Lift is a stretch a valve travels from a chair when opened, and generation is a volume of time a valve stays open. Higher lift and longer generation concede some-more atmosphere to upsurge into a explosion chamber, so a system’s high-lift lobe form enhances opening during aloft rpm, while a low-lift form optimizes potency during low- and mid-range speeds.

Dual-volute turbocharger builds torque

The 2.7L Turbo engine employs an modernized dual-volute turbocharger that elevates a opening and potency advantages of a required turbo, with quicker response and extended low-rpm torque production.

Rather than a singular turn cover (volute) feeding empty gas from a empty plural to expostulate a turbine on a turbocharger, a twin volute pattern has a span of apart chambers with twin empty gas inlets and twin nozzles to expostulate a turbine. The pattern allows a empty pulses of a engine to be leveraged for faster spool-up and successive boost production, quite during low rpm, where a outcome significantly enhances torque outlay and driveability.

It works in unanimity with a engine’s integrated empty manifold/turbocharger housing, that splits a empty channels from a cylinder conduct so a empty flows by twin apart channels in a turbo housing, formed on a engine’s empty pulses. When complemented by a pointing of a engine’s valvetrain, that subdivision leverages empty scavenging techniques to optimize gas flow, that decreases empty gas temperatures, improves turbine potency and reduces turbo.

An electronically tranquil wastegate and charge-air cooling complement support a turbocharger and raise a effectiveness. Compared to a required wastegate, a electronically tranquil chronicle offers some-more accurate government of a engine’s boost vigour for smoother, some-more unchanging performance.

With a charge-air cooler, a pressurized, exhilarated atmosphere generated by a turbocharger is pumped by a feverishness exchanger before it enters a engine. That lowers a atmosphere assign feverishness by about 74 degrees Celsius (130 F), make-up a explosion chambers with cooler, denser atmosphere that enhances energy production. The complement achieves some-more than 80 percent cooling potency with reduction than 2 psi (12 kPa) upsurge limitation during rise power, contributing to a engine’s accessible torque prolongation during low rpm.

Additional features

A variable-pressure oiling system, with a invariably variable-displacement vane oil pump, enhances potency by optimizing oil vigour as a duty of engine speed and load. With it, a oil supply is matched to a engine mandate rather than a extreme supply of a conventional, fixed-displacement oil pump.

Active Thermal Management helps a engine comfortable adult faster and grasp a optimal engine feverishness for opening and efficiency. The complement uses a rotary valve complement to discharge coolant by a engine in a targeted manner. It sends feverishness where it’s indispensable to comfortable adult a engine to revoke attrition and feverishness a cab, or cools when indispensable for high energy operation.

An electric H2O siphon – a initial for Chevy trucks –supports a Active Thermal Management complement and serve enhances a engine’s opening and potency by expelling a parasitic drag that comes with a required engine-driven H2O pump.

Direct fuel injection is used to optimize potency and performance. With approach injection, a aloft application ratio (10.0:1) is probable since of a cooling outcome as a injected fuel vaporizes in a explosion chamber, shortening a assign feverishness and improving insurgency to hint knock. Direct injection also enables scavenging from a explosion cover to a turbo for quick response.

Dual beyond camshafts minister to a 2.7L Turbo’s fibre and high output, with twin eccentric invariably non-static valve timing operative with a valvetrain to 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 driveability.

An integrated empty plural on a cylinder conduct public promotes faster engine warmup and quicker turbo response.

Oil jets located in a retard are employed for opening and feverishness control. They aim 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 and raise long-term durability.

Stop/start enhances fuel economy in city driving. The driver-selectable complement shuts off a engine during stoplights and certain other stop-and-go situations, saving fuel. The engine automatically restarts when a motorist takes their feet off a brake.

The all-new 2.7L Turbo is matched with a Hydra-Matic eight-speed involuntary transmission, featuring enhancements designed to urge change quality, as good as a new centrifugal pendulum absorber torque converter that reduces vibrations to urge smoothness.

The all-new 2.7L Turbo will be built during a General Motors Spring Hill trickery in Tennessee.

The 2019 Silverado goes on sale this fall. Transport Canada fuel economy estimates and towing/payload capacities are not accessible nonetheless and will be announced closer to launch.

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