Comments by "Mikko Rantalainen" (@MikkoRantalainen) on "FreeValve Isn't a Big Deal. Here's why" video.

@karlisbanis2442 The lifetime of the valvetime solenoids is also totally unknown. I would assume the the lifetime problems is the cause for the delays.
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@GeorgeWashingtonLaserMusket Yes, when you consider how many parts a single freevalve solenoid has inside, it's far from simple solution. Basically one solenoid is replacing one segment of valve lift cam and the valve spring. That's total of 2 parts. If (/when!) freevalve solenoid has more than 2 parts, the probability of failure goes up, not down. As a result, the solenoid requires higher manufacturing quality to result in similar lifespan. That doesn't exactly sound like the cheap solution, which is probably why it hasn't taken off. In theory, freevalve is a great product still.
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@chocolatethunder3218 Good points! I sure hope freevalve tech will get into ICE cars because full transition to EV will take quite some time still. It seems that the old video is all we have about the freevalve and I would guess it's still too expensive to use even though it has all the advantages explained in this video: https://youtu.be/S3cFfM3r510
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@alphaforce6998 Typical cylinder head with full valve mechanism is far from insignificant friction – try rotating the cam with bare hands... That said, I agree that air compressors are even harder to turn by hand. However, it's much easier to route air channels than to transfer mechanical movement so you could e.g. integrate the air compressor to the crankshaft reducing the need for any additional bearing surfaces.
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