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The Honda RA621H was a V6 1.6L turbocharged hybrid engine created by Honda in 2021. It was used to power the AlphaTauri AT02, as well as the Red Bull RB16B that won the World Drivers' Championship that year. This was the final Honda engine used in Formula One, as they decided to withdraw from the sport at the end of the season.

Initially, Honda had planned to use the Honda RA620H engine for an additional year due to COVID-19 and the postponing of the new regulations. However, the engine supplier changed its mind after it was announced they would be leaving Formula One at the end of the year.

While the other engine suppliers general focused on minor upgrades to the power units for the season, Honda took a more aggressive approach in a bid to win the championship in their final season. Despite having only six-months of development time, the company made multiple modifications to the engine. Compacting the camshaft layout and making the cylinders shorter resulted in a smaller engine than previous years.[1] Other modifications were also made to improve the performance and durability of the engine.


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Personnel
Yoshio Nakamura · Nobuhiko Kawamoto · Yoshitoshi Sakurai · Osamu Goto · Takeo Kiuchi · Ross Brawn · Nick Fry · Toyoharu Tanabe · Masashi Yamamoto · Yasuaki Asaki
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Toro Rosso · AlphaTauri · Red Bull Ring
Full Results
V T E Scuderia Alpha Tauri Logo 2020.jpg AlphaTauri
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10. France Pierre Gasly · 22. Japan Yuki Tsunoda
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Dietrich Mateschitz · Jody Egginton · Helmut Marko · Franz Tost · Graham Watson
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AT01 · AT02 · AT03
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