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Lotus, and I think possibly Honda, had something like this more than 30 years ago. IIRC the Lotus system was a hydraulic system, using fluid under pressure to actuate each valve independently.
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https://themediocrecyclist.home.blog
2004 Smart Fortwo 0.7 petrol.
Motorbike.
Many, many bicycles.
2019 Volvo XC90 T8 - 400BHP plug in hybrid insanity.
All journeys I do under 10 miles are human powered - I make journeys, not excuses..
2019 mileage - 1900 by car, 7100 by bicycle.
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