Could Toyota's hydrogen engine save combustion by converting engines?
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Toyota has developed a hydrogen combustion engine with nearly negligible harmful emissions. The project involved a Toyota Corolla Sport which participated in a 24 hour endurance race, using a 1.6L turbo inline three-cylinder out of the GR Yaris. The idea was to convert a gasoline engine to a hydrogen engine, as an alternative to creating new electric cars. With hydrogen combustion, oxygen and hydrogen are burned, providing useful work, with water as the only main emissions.

Naoaki Ito, one of the lead engineers on the project, puts it well: “For this hydrogen-powered engine, the engine itself remains the same as before. Our concept for this project was to create a hydrogen engine by using as much of the existing internal combustion technology as possible. We thought that achieving this would enable the conversion of existing car engines to hydrogen, providing a powerful weapon in the quest for carbon neutrality.”

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References:
Toyota Hydrogen Press Release - https://global.toyota/en/newsroom/cor...
Toyota Hydrogen Conversion - https://toyotatimes.jp/en/insidetoyot...
Toyota 24 Hour Race Results - https://toyotatimes.jp/en/insidetoyot...
Hydrogen Combustion Methods - https://www.mdpi.com/2076-3417/9/22/4842
Hydrogen Carbon Emissions - https://www.avl.com/documents/4053291...
Gas Carbon Emissions - https://climatekids.nasa.gov/review/c...
JRC Well-To-Wheels Report - https://publications.jrc.ec.europa.eu...
Hydrogen Production Costs - https://doi.org/10.1016/j.rser.2016.0...
Mirai Fuel Tank Weight - https://insideevs.com/news/323973/toy...

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