this post was submitted on 29 Aug 2024
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Rotary valves are more present in the musical instrument world, where they are used on French horns, some trombones, and some tubas.
On the topic of unconventional valves in automotive engines, I'd recommend taking a look at Koenigsegg's Freevalve technology.
https://carbuzz.com/what-happened-koenigsegg-camless-freevalve-technology/