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For twin-cam or DOHC engines, VCT was used on either the intake or exhaust camshaft. (Engines that have VCT on both camshafts are now designated as Ti-VCT.↓) The use of variable camshaft timing on the exhaust camshaft is for improved emissions, and vehicles with VCT on the exhaust camshaft do not require exhaust gas recirculation (EGR) as retarding the exhaust cam timing achieves the same ...
The first-generation single VANOS system adjusts the timing of the intake camshaft to one of two positions — e.g. the camshaft is advanced at certain engine speeds. [2] [3] VANOS was first introduced in 1992 on the BMW M50 engine used in 3 and 5 Series. In 1998 single infinitely variable VANOS was introduced on the BMW M62 V8 engine. [2]
Reduction of engine friction by machining the cam shaft to a crowning mirror-like finish and application of a fluorine coating to the chain guide Delayed valve closure timing of the intake, achieved through the increased conversion angle of C-VTC and superior timing management, thus reducing pumping loss when idling
The active valve control system (AVCS) is an automobile variable valve timing technology used by Subaru. It varies the timing of the valves by using hydraulic oil pressure to rotate the camshaft, known as "phasing", [1] in order to provide optimal valve timing for engine load conditions. The system is closed loop using the camshaft sensors ...
The application of intake valve type roller rocker arm, which reduces the friction produced when the camshaft is running. The application of Dual VVT-i system, which adjusts timing on both intake and exhaust camshafts. Improved cylinder head design. Longer intake valve, which improves lower-end torque. [12] Compatible with E20 fuel (Dual VVT-iE ...
The cam can be seen as a device that converts rotational motion to reciprocating (or sometimes oscillating) motion. [clarification needed] [3] A common example is the camshaft of an automobile, which takes the rotary motion of the engine and converts it into the reciprocating motion necessary to operate the intake and exhaust valves of the cylinders.
The 4G91 uses a bore and stroke of 78.4 mm × 77.5 mm (3.09 in × 3.05 in) for a total displacement of 1.5 L (1,496 cc). With a 9.5:1 compression ratio and DOHC, four-valve-per-cylinder head and multi-point EFI, this engine produces 115 PS (85 kW; 113 hp) at 6,000 rpm and 135 N⋅m (100 lb⋅ft) at 5,000 rpm. [1]
The CR14DE also features Variable Valve Timing on the inlet camshaft. It was first used in the Nissan K12 Micra/March in March 2002, [ 2 ] then the Z11 Nissan Cube in October 2002 [ 3 ] in Japan and the European E11 Nissan Note in March 2006 [ 4 ] It replaced the similar Nissan CG engine .