godlameroso wrote: ↑
Fri May 26, 2017 2:12 am
I think it could work with more pedestrian rev ranges of around 5,500 - 7,000 rpm, engines with long strokes, but not at F1 speeds.
Yet at those modest suggested rpm - is there really a significant advantage, in either valve timing/flow, or efficiency?
Regular high-longevity production engines using self-adjusting hydraulic lash VVT cams of such rpm range use..
..viz: the M-B M-104 DOHC 4V six cylinder, were available over a 1/4 century ago..
& one of the reasons F1 went back to forced induction was the overt inefficiencies of poppet valves..
..which showed in costly, short-life componentry, plus frictional , & gas flow-wise.. when used by ultra-high rpm N/A 4Ts..
Reasonable engineering alternatives - such as 2T, or even 4T sleeve/rotary valves, were quickly proscribed, 'of course'..