Quote:
Originally posted by HardDrive
Like Jeff said, they are simply not nessecary anymore. Ultra high RPM applications like F1 engines use some sort of pneumatic solenoids to open and close the valves, thus bypassing the need for any sort of 'valve train' at all. Major weight savings, and allows extremely high RPMs.
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I think F1 engines use a pneumatic chamber to close the valve instead of a spring.
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