https://www.caranddriver.com/news/a2...ogy-explained/
Best implementation I've seen, as the mechanical efficiency should be high, and there's no added reciprocating mass which eats power and limits durability at high speed. Very clever!
Typical load is like 50% on an engine, so a 270 degree grind on the intake cam would give minimized sliding friction in the mechanism. At high load low rpm, the duration can be shortened to 210 ish, and at idle it can be increased to 300+ for zero throttling losses.