The text about the "water engine" in this article is incredibly vague, and given the huge amount of energy needed to break the bonds in H2O molecules, it is unlikely that such a system will be ever be both workable AND provide more energy than required to separate the hydrogen from the oxygen in water.

I checked with an AI to see if I were missing something . . .

Response (to "Toyota Water Engine" prompt) from Brave Browser's Leo AI:

Toyota Water Engine

The term "Toyota water engine" is a misnomer that has led to widespread confusion and misinformation. Toyota has not developed a vehicle powered directly by water. Instead, the confusion stems from two distinct but related technologies: hydrogen fuel cell vehicles and hydrogen combustion engines.

The Toyota Mirai, a hydrogen fuel cell vehicle first launched in 2014, is powered by hydrogen gas stored in a tank. Inside the vehicle, hydrogen reacts with oxygen from the air in a fuel cell to generate electricity, which powers an electric motor. The only byproduct of this process is water vapor.

This technology is often inaccurately described as a "water-powered" car, but the vehicle does not run on water; it uses hydrogen, which is produced from various sources, including water via electrolysis, though the energy for this process must come from elsewhere.

A separate development is Toyota's patent for a water-cooled hydrogen combustion engine, which was filed in 2025.

This technology uses hydrogen as fuel in a traditional internal combustion engine, which burns cleanly, producing only water vapor as a byproduct. The innovation lies in a cooling system that injects water directly into the engine cylinders to manage the high temperatures associated with hydrogen combustion, improving efficiency and allowing for lighter engine materials.

This system is not a source of fuel but a method to cool the engine, and the vehicle still requires external hydrogen refueling.

In 2023, Toyota also developed a prototype Corolla Cross hydrogen combustion vehicle, which was tested in endurance racing, demonstrating performance comparable to a conventional petrol engine.

This prototype, like the Mirai, relies on externally supplied hydrogen, not water, as its fuel source.

In summary, while Toyota has made significant advancements in hydrogen-powered vehicles that emit only water vapor, these vehicles are not powered by water. The "water engine" refers either to the byproduct of the fuel cell process or to a cooling system in a hydrogen combustion engine, not to a vehicle that runs on water as a fuel.

It is a hydrogen powered engine. The infrastructure concept is to crack water at a filling pump to get the hydrogen. Not terrible, but it would need a cost analysis. I would use this tech for natural gas. Easy infrastructure and a good cost analysis is likely.

False: https://unionrayo.com/en/toyota-engine-hydrogen-water-45/

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