What is electromechanical (or camless) timing, how does it work and what advantages does it offer over traditional timing?
Electromechanical timing is one of the possible modern alternatives to the traditional, and today, obsolete, mechanical valve control. As is known, the most common “valve control” system in automotive engines is by mechanical drive chain: the camshaft (1) and then, the valves (2), are rigorously driven in this order. Notwithstanding the special type of coupling 1 and 2 chosen (1: chain, gears, toothed belt; 2: rocker arms, face rocker arms, springs, desmodromic), all these are “fixed” systems, in other words, they are NOT adjustable in real time: the final result, i.e. the valve motion, is unequivocally determined in the design phase and unequivocally linked with the drive shaft motion. The electromechanical control system design is simple: no camshafts or chains are used; each valve is controlled by a double solenoid (or electric magnet), coaxial with the valve: by electrically energising the upper or lower part, an up-stroke (closing) or down-stoke (opening) of the valve is obtained.
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