Mazda to offer world-first compression-ignition gasoline engine

Mazda to offer world-first compression-ignition gasoline engine
Mazda will debut a new compression ignition gasoline engine in 2019
Mazda will debut a new compression ignition gasoline engine in 2019
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Mazda will debut a new compression ignition gasoline engine in 2019
Mazda will debut a new compression ignition gasoline engine in 2019

Car manufacturers are delving deep into their boxes of tricks to make internal combustion engines more efficient. Infiniti unveiled a variable compression ratio engine last year, and hybrid technology is getting smarter, but Mazda has a different solution. In 2019 it will release the first commercial compression-ignition gasoline engine, dubbed SkyActiv-X.

At the core of Mazda's upcoming range of engines is technology called Spark Controlled Compression Ignition. Currently, gasoline engines ignite their air-fuel mixture with a spark from (aptly-named) spark plugs. The new SkyActiv-X line of engines will break with that process, instead delivering spark-free ignition of the air and fuel mix through compression.

If this sounds familiar, it's because diesel engines do the same thing. The process allows the engine to operate at lower temperatures, which reduces a lot of the heat energy normally lost in gasoline engines. This, in turn, allows Mazda to run with a much leaner air-fuel mix for better fuel consumption and lower emissions. According to the company, the technology is an evolution of the ultra-high compression ratio being used in its current range of engines.

Mazda says the new (proprietary) process combines the benefits of both diesel and gasoline engines, for significant improvements in fuel efficiency. Some other manufacturers have tried to nail the process in concepts, but the narrow temperature range at which compression ignition engines do their best work has caused problems. SkyActiv-X will avoid the issue by operating as a conventional, spark plug-ignited engine when conditions demand it.

Compared to the current lineup of SkyActiv-G engines, the SkyActiv-X line should use between 20 and 30 percent less fuel. Coupled with a supercharger, the tech should also yield between 10 and 30 percent more torque than the current (naturally aspirated) SkyActiv range.

The new engine technology was announced as part of Mazda's Sustainable Zoom-Zoom 2030 plan, which, among other things, outlines the company's plans for electrification and emissions minimization. Expect to see electric cars and "other electric drive technologies" in Mazdas in some markets by 2019. Don't expect the company to turn its back on gasoline and diesel, though – the plan says Mazda will "continue efforts to perfect the internal combustion engine."

Source: Mazda

Looks like the "otto" combustion cycle, once developped (still developping ?) by Mercedes Benz
SAAB had a variable compression ratio, gasoline engine that was proposed and prototyped about 20 years ago.
Not true--
An Otto cycle is an idealized thermodynamic cycle that describes the functioning of a typical spark ignition piston engine. It is the thermodynamic cycle most commonly found in automobile engines.
Dan Lewis
Time, of course, will tell whether this program is a bad one or not. I suspect they've taken a wrong turn in not devoting much more time and engineering in fully electric modes of transport.
Jim N
So, the charge is still homogeneous? HCCI has been in development for decades. Controlling it has posed great difficulties. Kudos to Mazda for implementing it when possible and harvesting the benefits at least during that mode of operation. Hopefully the map can be expanded over time.
Dan, why the fixation on coal-fired cars?
Lots of countries are now planning gas bans, so I wonder if Mazda is making the right move here?
no matter what kind of old or new tricks anyone uses to keep the fossil fuel industry burning hot or warm AND profitable, nothing beats full electric or other alternative clean energy AND cheap solutions! and for as long as electric charging stations are a rarity, then the best way out would be hybrid ...
now, if this compression thing is really good, fine, then mix it with electric and give us a *hybrid compression combustion electric* engine or whatever the fancy name you're going to put on that PLEASE and then Bob would be your and my uncle! thanks.
Gregg Eshelman
Rudolf Christian Karl Diesel would certainly approve of this development. His compression ignition engines ran on peanut oil.
The 'Mallard' of the auto world. The last little improvement before redundancy.
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