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if you call 1919 a recent innovation - VVT first appeared in ICE then, and made a resurgence in 1958 and again in the 1990's. electric superchargers have been
by jerrysievert 7y ago
if you call 1919 a recent innovation - VVT first appeared in ICE then, and made a resurgence in 1958 and again in the 1990's. electric superchargers have been around for a while as well, though not as prevalent due to the energy requirements. changes in the car electrical systems themselves have been allowing those to move forward, not innovation per se.