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The Alfa Romeo Twin Spark engine, introduced in the 1987 Alfa Romeo 75, also uses variable valve timing. [3] [4] The Alfa system varies the phase (not the duration) of the cam timing and operates on the inlet camshaft. [5] Alfa Romeo's variator is a cylindrical chamber that contains a pressure chamber and piston along with helical splines.
Variable valve timing (VVT) is the process of altering the timing of a valve lift event in an internal combustion engine, and is often used to improve performance, fuel economy or emissions. It is increasingly being used in combination with variable valve lift systems.
A variator is a device that can change its parameters, or can change parameters of other devices. [1] ... Variator (variable valve timing) Variomatic; VANOS; See also
Variator (variable valve timing) VarioCam; VTEC; VVT-i This page was last edited on 31 December 2018, at 21:56 (UTC). Text is available under the Creative ...
VANOS units on the intake and exhaust camshafts of a BMW N52 engine. VANOS is a variable valve timing system used by BMW on various automotive petrol engines since 1992. The name is an abbreviation of the German words for variable camshaft timing (German: variable Nockenwellensteuerung).
Variable valve timing gave the Twin Spark engine very good performance for its cubic capacity, but it is one of the weaker areas of the 16-valve engine. The original variator that controls the cam timing is prone to wear or jam, although replacement part carries a different part number and has improved reliability.