Skyactiv


Skyactiv is a brand name for a series of automobile technologies developed by Mazda to increase fuel efficiency and engine output. The initial announcement of the Skyactiv technologies included new engines, but has grown to include transmissions, as well as complete vehicle platforms, which have appeared in Mazda vehicles from 2011 onwards.

The Mazda Sky concept

The precursor of Skyactiv, which featured a Mazda Sky-G 2.3-liter gasoline direct injection engine, a Mazda Sky-D 2.2-liter diesel engine, a Sky-Drive automatic transmission, a Mazda Kiyora with Sky-G 1.3 engine and Sky-Drive automatic transmission, was unveiled at the 40th Tokyo Motor Show in 2008. The Skyactiv concept features a revised suspension geometry, improved automatic and manual transmission, and various improvements to Mazda's L- engine such as direct injection, upgraded exhaust manifold, increased compression ratio for cleaner burn and higher thermal efficiency, among other improvements. Mazda's previous chassis for the Mazda3 and Mazda6 were carried over to the new vehicles.

Skyactiv-G

The Skyactiv-G is a family of gasoline engines featuring gasoline direct injection and high compression ratios. Engines in the family have a compression ratio of up to 14:1, except in the United States where it is 13:1 to allow the use of regular gasoline; the lower compression reduces torque and fuel economy by 3 to 5 percent. To suppress engine knock at high compression, residual gas is reduced using a 4-2-1 exhaust system, optimized piston cavities, and fuel injection control. Combustion duration is shortened by increasing airflow, raising injection pressure, and using multi-hole injectors.
Skyactiv-G engines use all-aluminum construction with chain-driven dual overhead camshafts, variable valve timing, and meet U.S. ULEV emission standards.

1.3 L

The Skyactiv-G 1.3 is a naturally aspirated, inline-four engine with a bore and a stroke. It was unveiled at the 2011 Automotive Engineering Exposition.
Five Mazda engineers were awarded the 2011 Japan Society of Mechanical Engineers Medal on 20 April 2012 for their work on this engine.
It was first used in the Mazda Demio/Mazda2, the only Skyactiv engine paired with a CVT. The engine produces of power and of torque.
Applications:
The Skyactiv-G 1.5 is a naturally aspirated inline-four with a bore and stroke. Introduced in the 2014 Mazda3 for Asian and European markets, it produces of power at 6,000 rpm and of torque at 4,000 rpm. The engine significantly improved performance and fuel economy compared with the previous MZR 1.5 engine.
Applications:
The Skyactiv-G 2.0 is a naturally aspirated inline-four engine. It has an bore and a stroke.
In the United States, the engine has a 13:1 compression ratio that produces of power at 6,000 rpm and of torque at 4,600 rpm. A flexible-fuel variant increases output to and when running on E85 fuel.
Compared with the previous engine in the 2011 Mazda3, fuel economy improved from in city driving, and from on the highway.
Applications:
The Skyactiv-G 2.5 is a naturally aspirated inline-four engine introduced in the 2013 Mazda 6. It has an bore and a stroke.
In the United States, the 13:1 compression version produces of power at 6,000 rpm and of torque at 4,000 rpm. Output was raised to in 2023, with torque unchanged. Since 2018, the engine has also featured cylinder deactivation for improved fuel economy.
The engine is also used on Mazda's plug-in hybrid models, where it is marketed as the e-Skyactiv PHEV, and paired with an electric motor mounted between the engine and transmission. In the CX-60, it works with a electric motor and a 17.8kWh lithium-ion battery for a combined and. In the CX-70, CX-80, and CX-90 PHEVs, it is paired with a motor and the same battery, producing and on premium fuel, or on regular.
Applications:
  • 2013–2025 Mazda Atenza/Mazda6
  • 2013–present Mazda CX-5
  • 2014–present Mazda Axela/Mazda3
  • 2016–2025 Mazda CX-4
  • 2020–present Mazda CX-30
  • 2022–present Mazda CX-60
  • 2022–present Mazda CX-60 PHEV
  • 2023–present Mazda CX-50
  • 2023–present Mazda CX-90 PHEV
  • 2024–present Mazda CX-70 PHEV
  • 2024–present Mazda CX-80 PHEV

    2.5 L Turbo

The turbocharged version of the Skyactiv-G 2.5 has a 10.5:1 compression ratio. On premium fuel it produces of power at 5,000 rpm and of torque at 2,500 rpm, while on regular fuel output is reduced to at 5,000 rpm and at 2,000 rpm. Maximum boost pressure is. To reduce turbo lag, the engine uses specially designed exhaust passages and butterfly valves that route gases through smaller orifices at low rpm, allowing the turbocharger to spool more quickly. It also employs a unique 4-2-1 exhaust manifold to improve exhaust scavenging and a cooled exhaust gas recirculation system, both designed to reduce combustion chamber temperatures and allow for increased boost with better fuel economy. Intercooler configuration varies by application: the CX-5 and CX-9 use an air-to-air intercooler, while the Mazda3 and CX-30 use an air-to-liquid intercooler integrated into the intake manifold to save space.
Applications:
  • 2016–2024 Mazda CX-9
  • 2018–present Mazda CX-8
  • 2018–2021 Mazda6
  • 2019–2025 Mazda CX-5
  • 2021–present Mazda3
  • 2021–present Mazda CX-30
  • 2023–present Mazda CX-50

    3.3 L

The Skyactiv-G 3.3 is a longitudinal turbocharged inline-six gasoline engine introduced in the 2023 Mazda CX-90. It has an bore and a stroke. It has a 12:1 compression ratio.
The engine is offered in two versions. The lower-output version produces of power and of torque. The higher-output version produces and on premium fuel, or on regular.
Applications:
  • 2022–present Mazda CX-60
  • 2023–present Mazda CX-90
  • 2024–present Mazda CX-70
  • 2024–present Mazda CX-80

    Skyactiv-X

Skyactiv-X is the first commercial gasoline engine to use homogeneous charge compression ignition, in which the fuel-air mixture ignites spontaneously when compressed by a smaller, separately ignited charge of fuel. This allows it to reach a compression ratio of 16:1, an improvement over the 14:1 ratio of the Skyactiv-G. The engine can operate much leaner than a conventional spark ignition engine, reducing fuel consumption and emissions.
This engine targets 20-30% greater fuel efficiency by utilising HCCI technology. In order to handle ignition problems caused by compression ignition, each cylinder also incorporates a spark plug featuring Spark Controlled Compression Ignition technology. A small Roots-type supercharger further expands the compression ignition operating window by feeding more air into the engine, leaning out the mixture sufficiently for compression ignition even at higher speeds.
SPCCI works by drawing in a lean, homogeneous air-fuel mixture, it then compresses the mixture until it approaches the point at which it would spontaneously detonate. A second injector then adds a secondary charge of fuel directly on the spark plug. This secondary charge is ignited by the spark plug, causing the cylinder pressure to very quickly rise to a point where the rest of the fuel undergoes compression ignition. The presence of the spark plug allows the engine to also operate as a spark-ignition engine under some operating conditions, such as high-speed high-load situations. Revealed June 5, 2019, the output is and.
Mazda is developing an inline-six variant of the Skyactiv-X, with displacements of 3.0 and 3.3 liters and a rear-wheel-drive layout. It was believed that production of the new engine would begin in 2022 with the Mazda CX-60. However, according to Road & Track magazine, in the March 2022 edition of Autocar magazine Mazda Europe's Development & Engineering Senior Manager Joachim Kunz stated that there were no plans for a Mazda rear drive sedan, since Mazda was prioritizing SUV sales.

2.0 L

Applications:
  • 2019–present Mazda3
  • 2019–present Mazda CX-30

    Skyactiv-D

Skyactiv-D is a family of turbocharged diesel engines, designed to comply with global emissions regulations.
To eliminate the need of NOx and particulate treatment in contemporary diesel engines, the cylinder compression ratio is reduced to 14.0:1. Cold engine start is achieved via multi-hole piezo injectors with 3 programmable injection patterns, and adoption of ceramic glow plugs. Engine misfiring is prevented via variable valve lift at exhaust, which opens exhaust valves during the intake stroke, which in turn increases engine air temperature. The Skyactiv-D also uses a two-stage turbocharger, in which one small and one large turbo are selectively operated, according to driving conditions.

1.5 L

The Skyactiv-D 1.5 is a engine first introduced in the fourth generation Mazda Demio/Mazda2. It features a compression ratio of 14:1.

SKYACTIV-D 1.5

Applications:
  • 2014–present Mazda Demio/Mazda2
  • 2014–2018 Mazda Axela/Mazda3
  • 2015–2018 Mazda CX-3

    1.8 L

The Skyactiv-D 1.8 is a that was introduced in the 2018 facelifted Mazda CX-3.

SKYACTIV-D 1.8

Applications:
  • 2018–present Mazda CX-3
  • 2019–present Mazda3
  • 2019–present Mazda CX-30