Mazda’s Radical 6 stroke engine could challenge the EV future

The EV hype is fading

Not long ago, electric cars were seen as the future. They promised cleaner cities, fewer trips to gas stations, and a big step toward fighting climate change. But reality has shown some bumps in the road.

Long charging times, high prices, limited range, and towing restrictions have caused many drivers to rethink their options. These frustrations have opened the door for new ideas, especially from automakers looking to keep gasoline-powered cars alive in a cleaner way.

Mazda’s bold new patent

Mazda recently filed a patent that caught attention across the car world, a six-stroke internal combustion engine. Traditional engines use four strokes, intake, compression, power, and exhaust, which have been standard for more than a century.

By adding two extra strokes, Mazda hopes to change how gasoline is used inside an engine. The application states the goal is to reduce tailpipe CO₂ by capturing carbon as a solid and combusting hydrogen-rich gas, while conventional pollutants like NOx would still require control.

Gasoline stays in the game

Unlike battery-powered vehicles, Mazda’s idea does not abandon gasoline. Instead, it takes the fuel we already use and changes how it works inside the engine. That means drivers could keep filling up at the same stations without switching to electricity.

At the same time, the process inside the cylinders looks very different from what we’re used to. Instead of burning gasoline directly, the engine turns part of that fuel into hydrogen. The car then uses hydrogen for combustion, which could drastically reduce carbon emissions.

Splitting fuel for clean power

The heart of this idea lies in breaking fuel into two parts, hydrogen and carbon. Hydrogen is used to power the car, while carbon is captured instead of being released into the air.

That’s a big change from normal engines, which simply burn gasoline and push out carbon dioxide as exhaust. By rethinking the process, Mazda’s patent aims to deliver the same driving experience people are used to, but with far fewer emissions escaping into the atmosphere.

Both gasoline and hydrogen

So what kind of engine is this, really? It’s not fully gasoline, and it’s not purely hydrogen, it’s both at once. Mazda’s system uses gasoline as the base fuel, then transforms it into a cleaner-burning option.

This best of both worlds approach allows the car to work with today’s fuel infrastructure while aiming for the cleaner operation of hydrogen engines. For drivers, that means familiar refueling habits paired with technology that promises less environmental impact on the road.

How six strokes work

Most engines stick to four familiar steps: intake, compression, combustion, and exhaust. Mazda’s design keeps those basics but builds on them with two extra stages. Per Mazda’s filing, the fifth stroke is re-compression, and the sixth is re-expansion.

These additions give the engine time to separate hydrogen from gasoline and capture the carbon left behind. In theory, these changes could transform how fuel is burned, turning a well-known process into something far more advanced.

The magic of re-compression

During the re-compression stroke, exhaust gases are pushed into a special device called a decomposer. It works almost like a high-tech filter but with a chemical twist.

In this stage, heat and catalysts break down the gasoline molecules. The hydrogen is pulled away and saved for combustion, while the leftover carbon is trapped. This simple-sounding step is what makes the entire system possible, setting it apart from ordinary engines.

Small hydrogen, solid carbon

The design includes a hydrogen gas supply section that buffers reformate before it’s fed to the cylinders; because the hydrogen is produced onboard from gasoline, no external hydrogen refueling is needed.

The carbon, however, becomes a solid material that must be stored separately. Over time, it collects in a special container in the car. When that tank fills, drivers would need to have it emptied, much like refueling, but in reverse.

What happens to the carbon

The big question is what to do with all that collected carbon. Mazda’s patent suggests it could be reused in industries that need pure carbon for production.

From steelmaking to pigments, solid carbon has real value. Instead of being a waste product, it could become a useful material. This idea could help close the loop, turning something harmful into something practical.

Clear advantages on paper

One advantage is obvious, cleaner tailpipe emissions. If the system works as intended, cars could keep using gasoline without adding as much pollution to the air.

Another plus is convenience. Drivers wouldn’t need new charging networks or hydrogen stations. The same gas pumps we already use would still work, making the transition much easier for everyday people.

Complexity creates problems

The downside is complexity. Adding new valves, decomposers, and storage systems makes the engine far more complicated than today’s designs.

With more moving parts, there’s more that can break. Repairs and maintenance could cost more, and reliability may not match the simplicity of electric motors, which have fewer parts to worry about.

The heavy carbon burden

Each gallon of gasoline contains around 5.5 pounds of carbon. For a typical 15 gallon fill up, that’s more than 80 pounds of solid carbon that needs to be stored.

Carrying that extra weight could affect performance, efficiency, and storage space inside the vehicle. Unless a clever solution is found, drivers may not want the hassle of dealing with heavy carbon tanks during regular use.

Efficiency is a big unknown

How efficient could this engine be? That’s still a mystery. Breaking down gasoline into hydrogen takes energy, and it’s unclear if the process would waste more fuel than it saves.

Overall efficiency is uncertain: H₂-ICE efficiency varies by design and operating strategy, and energy used to reform fuel will affect net results. Until Mazda builds and tests a real version, there’s no way to know if this design can deliver the performance people expect.

Mazda’s contrarian history

Mazda has a reputation for unusual engine projects. They stuck with the rotary engine long after competitors gave up, even though it was less efficient and harder to maintain.

More recently, they developed a spark-controlled compression ignition engine, which blends features of diesel and gasoline motors. Their history shows a willingness to take risks on technology others consider too strange or impractical.

A reputation for risk

Because Mazda often goes its own way, many people see this patent as a natural move for the company. It matches their history of chasing bold ideas.

The six-stroke engine might be risky, but it has captured attention. Whether it becomes reality or not, it reinforces Mazda’s image as an automaker willing to think differently about the future.

Where it could show up first

Mazda might start testing this technology in SUVs or compact cars, where space for extra components is easier to manage. Larger vehicles also offer a better platform for experimental engines.

In urban areas, lower tailpipe CO₂ would be appealing, though NOx control would still be required.

EVs still have the momentum

Even with new engine ideas, electric vehicles continue to grow in popularity. Prices are coming down, charging networks are expanding, and batteries are improving.

More families are already making the switch, and governments are pushing for faster adoption. This momentum makes it harder for any new gasoline technology to catch up, no matter how inventive it is.

Curious how old-school muscle is getting an electric makeover? Check out Chevy’s revival of a classic icon.

Future or just a fantasy

Mazda’s six-stroke engine could change the way we think about gasoline cars, or it could remain a clever idea that never leaves the drawing board.

Still, the patent shows that engineers aren’t giving up on innovation. From EVs to hydrogen to carbon capture, the race to build cleaner cars is wide open. Mazda’s bold idea is one more piece of that evolving puzzle.

Love Mazda’s wild side? See how the legendary Veilside RX-7 from Tokyo Drift just smashed records.

Would you drive a car with Mazda’s six-stroke engine, or stick with EVs? Share your thoughts in the comments, and don’t forget to hit like.

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This slideshow was made with AI assistance and human editing