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Old 10-25-2017, 09:12 AM   #1
AVANTI R5
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Default TOKYO MOTOR SHOW: Mazda’s SKYACTIV-X highlights

Quote:
Next-generation combustion engine technology officially revealed in Japan


https://paultan.org/2017/10/25/tokyo...t-gen-mazda-3/

With new technology, Mazda gives spark to gasoline engine
20 Hours Ago | 01:25

Koki Nagahama | Getty Images

In the high-stakes, high-cost battle among global automakers to develop ever more efficient vehicles, one of the biggest breakthroughs in internal combustion engine technology in years looks to be coming from one of the industry's smaller players.

Japan's Mazda Motor Corp has zoomed past its larger global rivals to develop an engine which ignites gasoline using combustion ignition technology, a fuel-saving process considered something of a holy grail of efficient gasoline engines.

As global emissions regulations get tougher, not only could Mazda's technology prolong the life of internal combustion engines, it could also improve "greener" engines as they can be used to produce more efficient gasoline hybrid and plug-in hybrid vehicles.

Mazda will showcase the Skyactiv-X technology at the Tokyo Motor Show this week. When it launches the engine in 2019, the automaker says it will deliver as much as 30 percent fuel efficiency over its Skyactiv-G engine, already one of the most fuel efficient gasoline engines on the market.

"Our resources are limited, so unlike bigger automakers, we don't have the array of options in which to invest our R&D funds," said Mitsuo Hitomi, managing executive officer at Mazda who oversees engine development. "That's why we're betting on this technology ... We were determined that no matter what, we would develop this engine," Hitomi told Reuters in an interview at the company's headquarters in Hiroshima.

Churning out around 1.6 million in annual vehicle sales, Mazda accounts for only a sliver of global car sales, and its R&D budget is roughly a tenth that of automaking giant Toyota Motor Corp.

Many automakers with big spending budgets have invested heavily in developing a host of new powertrain technologies, including gasoline hybrids, battery electric cars and fuel cell vehicles, as fuel efficient alternatives to gasoline and diesel vehicles.

But Mazda believes fuel-sipping engines are a better way to reduce carbon emissions than cars powered by fossil fuel-generated electricity, focusing on the Skyactiv-G high-compression gasoline engine, and its diesel cousin, the Skyactiv-D.

Its latest technology is a variant of homogeneous charge combustion ignition (HCCI) technology, which marries the clean-burning qualities of gasoline engines and the fuel economy and grunt of diesel engines to produce an efficient, powerful engine.

Precise timing required

Mazda's engineering team began developing the engine around the time it completed developing its Skyactiv-G engine, which came out in 2011.

From the start, solving the multiple variables required to balance performance with successful compression ignition was a challenge so complex and frustrating that there were "countless times" the team wanted to throw in the towel, Hitomi said.

Engineers at General Motors, Honda Motor Co and other automakers have also pondered how to develop a cost-effective way to control the HCCI process, which requires precise timing inside the engine chamber to achieve efficient ignition.

Hitomi and his team came up with a relatively simple solution - to facilitate sparkless ignition, use a spark plug to light a high-pressure "fireball" inside the chamber to compress the super-lean mix of fuel and air.

The process is controlled by precisely monitoring each movement in the combustion chamber, enabling visibility of when the intake valve allows air to be drawn into the chamber to when the fireball is ignited.

"Kudos to them for taking the next step," said Paul Najt, Group Manager of Research & Development at GM, which began showing an early HCCI prototype around 2007.

GM has since applied HCCI technologies to develop smaller, turbocharged engines, but Najt said the automaker was not developing a full system at the moment due to cost concerns. In the meantime, it has released gasoline hybrid and other electric models.

'A monster of an engine'

Hitomi said Mazda's spark plug breakthrough came during a crisis point around two years ago, when the development team showed him an early rendition of the engine.

"It had so many parts to it, like separate controls for variable valve timing and intake and exhaust levels, that it had become a monster of an engine," too costly to produce, he said.

The team then "performed massive surgery" to simplify the engine, using a spark plug to achieve an even compression ignition process and stripping unnecessary functions.

Now the Skyactiv-X engine consists of just three additional key components compared with the Skyactiv-G: in-cylinder sensors to monitor the combustion process, a high pressure fuel system to create the optimal fuel mix and a supercharger.

The cost of the new engine "falls somewhere between a gasoline and diesel engine", Hitomi says.

Massachusetts Institute of Technology Prof. William Green, who has worked with HCCI development teams at U.S. automakers, said Skyactiv-X's efficiency gains may be limited compared with hybrids and the even larger longer-term potential benefits of EVs.

But the automaker could win over customers looking for an inexpensive, fuel-saving option which does not require battery recharging time or infrastructure, he added.

"It has the advantage of being simple and straight forward, not expensive, and practical. Those are a lot of advantages."
https://www.cnbc.com/2017/10/25/with...ne-engine.html
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Old 06-06-2019, 07:49 AM   #2
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Default Mazda Skyactiv-X 2.0L Engine Confirmed With 178 HP, 165 lb-ft

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European buyers can get the Skyactiv-X mill with either front- or all-wheel drive.

When asked Mazda North America about the Skyactiv-X engine's chances of coming to the United States. The company sent the following statement:

"We are currently studying when to launch Skyactiv-X in North America, in consideration of the business environment and the market needs. Skyactiv-X is not the only way we are making our cars more competitive. We are making continuous updates to our existing Skyactiv-G and Skyactiv-D engines, including adding cylinder deactivation, optimizing displacements, and adding turbocharging. With all new technologies, our approach is to take a comprehensive look at the needs, business environment, and regulations of each market and make a decision on the most appropriate technologies to introduce and the appropriate timing at which to launch them."

Following printing figures in a Slovakian market brochure, which is no longer online, Mazda now confirms the official European specs for its highly anticipated Skyactiv-X engine in the Mazda3. The 2.0-liter four-cylinder powerplant makes 177 horsepower (132 kilowatts) and 165 pound-feet (224 Newton-meters) of torque. Deliveries of the Mazda3 with the new mill begin in the fall, and pricing isn't available at this time. For comparison, the earlier numbers from Slovakia put the specs at a very similar 178 hp (133 kW) and 164 lb-ft (222 Nm) of torque.

The Skyactiv-X engine in the Mazda3 also comes standard with a 24-volt mild hybrid system. The tech is able to harvest energy during deceleration and releases it to boost fuel economy.

European buyers can order the Skyactiv-X engine on either the hatchback or sedan body styles. Customers also have a choice of a six-speed manual or six-speed automatic gearbox.

At its best in the six-speed manual, front-wheel-drive sedan, the Skyactiv-X engine delivers 5.4 liters per 100 kilometers combined fuel economy in the WLTP test. This figure is roughly equivalent to 44 miles per gallon, but it's worth noting that the American EPA evaluation is different, so the Mazda3 with this mill would not have an identical rating in the United States.

The Skyactiv-X engine is capable of running both on spark-controlled ignition, like most gasoline-fueled vehicles, and compression ignition, like a diesel. While the mill arrives in Europe and Japan soon, Mazda isn't yet saying when or if the powerplant is coming to the U.S. Americans can currently only get the Mazda3 with a naturally aspirated 2.5-liter four-cylinder producing 186 hp (139 kW) and 186 lb-ft (252 Nm).

Mazda today launched its revolutionary Skyactiv-X petrol engine in the All-New Mazda3.

Customers can now order the All-New Mazda3 Skyactiv-X3 in various European countries, with the first customer deliveries due this autumn.4

Featuring Mazda’s unique Spark Plug Controlled Compression Ignition (SPCCI) technology, the 2.0 litre, four-cylinder Skyactiv-X engine is the world’s first commercial petrol unit to combine the spark ignition of a petrol engine with the compression ignition of a diesel.

Providing drivers with the free-revving performance of a gasoline engine and the superior response of a diesel, the All-New Mazda3 Skyactiv-X3 delivers 180 PS and 224 Nm of torque. The All-New Mazda3 Skyactiv-X Sedan achieved 96 g/km CO2 emissions and a fuel economy of 4.3 l/100km.1,2,3

The All-New Mazda3 Skyactiv-X3 is also equipped with Mazda M Hybrid technology, fitted as standard. The intelligent 24V mild-hybrid system minimises fuel consumption, increasing fuel economy and lowering emissions by recycling energy recovered during deceleration that powers an electric motor that assists the engine.

The All-New Mazda3 Skyactiv-X3 is available on both the hatchback and sedan models, with a choice of six-speed Skyactiv-MT manual or six-speed Skyactiv-Drive automatic transmissions. The Mazda i-Activ all-wheel-drive system is available as an option on the All-New Mazda3 Skyactiv-X Hatchback.

Mazda press release
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Old 06-06-2019, 12:31 PM   #3
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I remember reading that one of the Mazda execs answered a question about this motor going into the MX-5 and said it didn't fit the character of that car.
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Old 06-06-2019, 01:48 PM   #4
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Originally Posted by Keshav View Post
I remember reading that one of the Mazda execs answered a question about this motor going into the MX-5 and said it didn't fit the character of that car.
Right up there with subaru's EJ comments around the STI and toyobaru's comments regarding power and the twins.

It's just marketing lies and really only comes down to "we don't think it's worth it for us to do this."

This isn't as bad an offender as the twins (seriously, #1 complaint since the car dropped has been lack of power and they just absolutely refuse to budge on it) but I still think they're off-base. These new engines are awesome and I see nothing wrong with it going into an already anemic miata. Can't be that much different.

Last edited by BeepBoop; 06-06-2019 at 02:49 PM.
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Old 06-06-2019, 01:52 PM   #5
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I wish they have a version without the hybrid so we can compare directly between the X and G.
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Old 06-06-2019, 02:50 PM   #6
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Good luck if any of those cylinder pressure sensors fail on you out of warranty.
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Old 06-06-2019, 05:11 PM   #7
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i am heavily looking into a 2nd generation CX-5. One thing that concerns me with the newer turbo models, is their hard plastic intercooler couplers and the turbo inlet hose is plastic. The radiator on my wrx was plastic and that sure didnt last very long. Is plastic more reliable than the rubber style?
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Old 06-06-2019, 05:21 PM   #8
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Originally Posted by David Medina View Post
i am heavily looking into a 2nd generation CX-5. One thing that concerns me with the newer turbo models, is their hard plastic intercooler couplers and the turbo inlet hose is plastic. The radiator on my wrx was plastic and that sure didnt last very long. Is plastic more reliable than the rubber style?
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Old 06-06-2019, 06:35 PM   #9
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Quote:
Originally Posted by David Medina View Post
i am heavily looking into a 2nd generation CX-5. One thing that concerns me with the newer turbo models, is their hard plastic intercooler couplers and the turbo inlet hose is plastic. The radiator on my wrx was plastic and that sure didnt last very long. Is plastic more reliable than the rubber style?
plastics are freaking everywhere man... might as well get used to it. My oil pan is made of plastic.
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Old 06-06-2019, 08:24 PM   #10
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Mazda makes some seriously fuel efficient engines. I could not believe I was getting like 50mpg on a Mazda6 when going about 65-70miles out during a business trip.

I thought the fuel gauge was broken until I put some fuel in the rental and could barely get over a gallon in.
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Old 06-07-2019, 01:08 AM   #11
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Quote:
Originally Posted by bemani View Post
I wish they have a version without the hybrid so we can compare directly between the X and G.
FWIW, I believe you can. I think it's a misunderstanding on the part of the writer, it sounds like he is talking about i-ELOOP, which even my car has. It uses the power from regenerative braking to temporarily charge a capacitor which then powers the accessories so the alternator doesn't have to do it, it doesn't power the wheels (there is no electric motor). It saves a bit of gas, but it's not a hybrid system per se. Also, the SkyActiv-G motors like mine have it as well, so it's a like comparison to the SkyActiv-X.
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Old 06-07-2019, 01:20 AM   #12
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Originally Posted by BeepBoop View Post
Right up there with subaru's EJ comments around the STI and toyobaru's comments regarding power and the twins.

It's just marketing lies and really only comes down to "we don't think it's worth it for us to do this."

This isn't as bad an offender as the twins (seriously, #1 complaint since the car dropped has been lack of power and they just absolutely refuse to budge on it) but I still think they're off-base. These new engines are awesome and I see nothing wrong with it going into an already anemic miata. Can't be that much different.
Last year they upgraded the SkyActiv-G engine in the Miata so it makes essentially the same power as this (181hp, up from 155hp in the launch version of the ND), so I don't really see the X being an immediate upgrade for the Miata. Since the power is essentially the same, and they specifically retuned the Miata's motor to rev higher and make the power it does; I imagine that why he was saying that: The higher revving character of the new G motor is more sporting. Mind you, the 155hp version of the car was already quicker than the twins, now it has an extra 26hp.
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Old 01-24-2020, 07:11 AM   #13
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Default US May Have To Waite A While For Skyactive-X Mazda States

Hit Autonews article comes up in background you can still read it and scroll it, it’s not as bright because it is for members only, I can’t get mine to come up as of now.


https://www.autonews.com/sales/us-ma...das-skyactiv-x
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