Mazda’s Revolutionary 177HP Skyactiv-X Engine Emits Just 96g/km Of CO2

Mazda has finally announced the official fuel economy and CO2 figures of its widely anticipated Skyactiv X engine, the world’s first petrol engine available in the market with both spark and compression ignition.

We have already reported that the 2.0-liter Skyactiv X four-cylinder unit produces 177hp (180PS) and 165lb-ft (224Nm) of torque but now the company is letting us know that the Mazda3 with this engine returns from 52.3 mpg UK (43.5 mpg US/5.4lt per 100km) combined and emits just 96 gr/km of CO2, depending on transmission and wheel size, per the latest WLTP tests.

Also Read: Mazda Has No Immediate Plans To Bring Its Skyactiv-X Engine To America

By combining spark and compression ignition, Mazda claims that its new powertrain technology improves fuel economy and reduces CO2 emissions by up to 30 percent, thanks to its super lean burn combustion. The upcoming Mazda3 Skyactiv X also features a mild-hybrid 24V system that helps it keep consumption and emissions at a minimum.

The new engine will become available on both the hatchback and the saloon models of the compact car, paired to a standard six-speed manual or an optional six-speed auto. Mazda will also offer the option of all-wheel drive, though only with the hatchback body style.

The new Mazda3 is already available in the European market with both a petrol and a diesel engine. The new Skyactiv X derivative will sit on top of the range next month, when the company announces the official pricing and specification details.



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  • What’s the point? Stone age technology with couple of percent efficiency improvement.

    Electric motors can be as efficient as 98%, with average around 90%.
    ICE’s can be as efficient as 40%, with average around 33%.

    We switched from the horse, now it’s time to switch from the ICE.

    • Matt

      The point is improved efficiency and reduced emissions, I thought that was obvious. “But EV’s…..” yeah we know.

    • ace_9

      We switched from horses to cars 🙂 What you want to say is that now we should switch to electric power instead of burning fossil fuels. But that is much much more difficult than just changing the petrol engine with electric one. Or you do believe that there is enough electricity and wires to provide everyone currently having a car with enough electricity?

      • Yes. You don’t have to trust me, but that’s the case – check researches. The reason is very simple. The change is not from day one to day two, but most countries could easily change to 100% electric vehicle park within the next few years. Actually the more “smart” electric cars, the better for the grid, as they can be used to balance. Google: “parked EV batteries can save billions in grid balancing”.

        • ace_9

          Ok, I will believe it when I see it 🙂 Maybe after a few years (10+ I guess in my country). But I will still miss petrol cars. I don’t care about acceleration, quietness or simplicity of powertrain and much less the ease of driving.

    • Mr. EP9

      What do you mean what’s the point? That stone age technology has been around for over a century and there’s a damn good reason for it; because it works. You keep saying EVs can be as efficient as ICEs but in practice, that couldn’t be further from the truth. The range of EVs compared to their ICE counterparts is like night and day. EV technology is still in development and is not ready to fully replace ICEs……not yet. Furthermore, what’s wrong with improving the efficiency of the technology that’s still widely in use? What’s wrong with reducing carbon emissions and CO2? I thought someone like you would be all for it, but I guess not.

      • The money invested in the genius but wasteful tweaking of internal combustion engines could be spent on 1. getting more range out of the batteries 2. make the charging times faster. It’s obvious that ICE has no future. In a few years in the developed world nobody in their right mind will buy one. What Mazda does is slowing down the electric revolution. That also means the increase of CO2 emissions (as well as all the cancerous gases that cannot be found in EV’s).

        About the range: I do not agree. You can buy a family car for $37k that has 415 km’s of range, even in worst conditions that would translate to 250-300 km’s. I’m not talking about a Tesla. You do realize less than 1% of the travels are above this distance? Even so, in the rare cases someone drives longer than that, a coffee / food stop and you can continue your trip. I understand it’s not convenient for everyone, but you compromise a little and you are rewarded with 4 times better fuel efficiency by standard and you won’t pollute the cities anymore. When millions are dying of air pollution, this is a tiny sacrifice.

        • Kevin Cagle

          What’s not convenient is that Electric range like that will cost at least 37k but more likely 40k and above. In a dream world where price is not object I think you are right, but this Mazda is going to cost at least $10k less than that if not more.

          • Kevin, the price I quoted is the official price of Hyundai Kona that’s on their website. The 10k less you pay for the Mazda will be spent on more maintenance (EV’s are extremely simple), and on fuel. This is the reality as we speak. In the meantime newer and newer EV’s are coming out and you can expect each year more range and better charging times as well as cheaper price tags as the batteries decrease in price.

          • Kevin Cagle

            I am guessing you are from over the pond. electric is more viable there now. Still not a reality here yet. I can’t even drive to Houston on that charge. So, there is a transition period right now. Hybrids are great at giving both power and long range due to long distances people drive here on vacation. 500 miles is common for a vacation in the car, business trip or just a quick getaway. Quick getaways for a day or two here its common to drive 300-400 miles. And in the Southern US, charging stations are few and far between right now.

          • You are right. How about Tesla superchargers? I thought US is covered. The Model 3 considering long term use does not seem to be a bad option and it has a 300 miles range. You would only need to stop once for a longer charge or twice for 20 mins charge. The Model 3 is now capable of charging at 1000km’s/hour on the new superchargers.

        • brn

          ICE has been around a long time. EVs have been around longer. The only reason EVs are now a viable option is that we’ve had more than a century to evolve battery technology (and we still have a long way to go).

          EVs may be the future, they do not yet obsolete ICE. Why do we hate one or the other?

    • Kevin Cagle

      This Mazda is just barely more polluting than a Prius, but probably safe to assume will be significantly more fun to drive. The 0-60 will be close to the current 2.5l which is 7.0 sec flat. The prius is 10 seconds to get to 60 and practically the pokiest thing on the road. I hope the car fares well , because it looks great on paper.

    • mas921

      hybrid as in eFuels (ICE with *negative* CO2 emissions) or hydrogen. stuffing lithium “laptop” batteries is stupid, even the creator of Lithium batteries says so.
      Besides, a Tesla emits 240g of CO2 according to an MIT study, the mazda’s “ICE” engine is 250% more eco friendly! 2-5-0%!!

  • Six_Tymes

    Nice to see they continue to innovate. Ill buy if they lower their prices.

  • Alex87f

    I’m a tad confused here. In an optimal & stoechiometric combustion, one liter / 100km of fuel consumption equates about 23.8 grams of CO2 per km. In a diesel that’s about 26.2 grams of CO2/km.

    In this car, with a 5.4 liter / 100km fuel consumption and just 96 grams of CO2 / km, we’re talking about 17.8 grams of CO2 / km for every liter / 100km of fuel consumption. How are they achieving this?

  • Alpina

    Tehnicaly praiseworthy work, but IMO the price will be too high for extra 0,5l/km and CO2 under 100g.
    This translate in 500 dollars less tax in my country. Other thing is how clean the gasoline should be? Yes they are all Euro6 now but my region is known of “dirty” derivates and the more East you go the worst it gets. I recon this engine is very octane and “gasoline cleanness” sensitive.

  • sidewaysspin

    Doesn’t have that much torque.

    • Super Rob

      My exact thoughts. I was expecting higher torque numbers from this engine.

  • brn

    Far from it. Euro cycle numbers can’t be compared to US cycle. The power and efficiency of this motor is disappointing.

  • Exotics

    My EV emits 0g/km of Co2

    • mas921

      Bullsh!t! your EV run by hamsters? a study by MIT concluded that a Tesla emits 240 grams of CO2 (250% of the sky active above!) through power generation in the power plants.

  • The change from 1.5% to 50% will happen so quick that Mazda and the other manufacturers won’t have the time to adapt. What I’m saying here is not to stop the sales of ICE cars (that’s suicide), but to not invest vast amount of money on R&D of ICE technology. That’s my point.

    See Norway as an example, their car sales are now mostly EV, it all happened within the last few years. Norway is one if not the most developed countries in the world. What happens there will happen in the rest of the countries. It’s all about economics, prices of batteries go down, and because the maintenance of EV’s are so cheap (due to fuel and few moving parts) it will not make financial sense to buy ICE’s.

    I give it 5 years in the developed world and this will happen. We will reach price parity of EV / ICE, but EV is cheaper in the long run, so there you go. Suddenly nobody will want to buy ICE’s, and then what will happen with the billions poured in an old technology?

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