variable valve

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• Variable valve timing — Variable valve timing, or VVT, is a generic term for an automobile piston engine technology. VVT allows the lift or duration or timing (some or all) of the intake or exhaust valves (or both) to be changed while the engine is in operation. Two… …   Wikipedia

• Variable valve actuation — Variable Valve Actuation, or VVA, is a generalised term used to describe any mechanism or method that can alter the shape or timing of a valve lift event within an internal combustion engine. There are many ways in which this can be achieved,… …   Wikipedia

• Variable Valve Control — VVC (Variable Valve Control) is an automobile variable valve timing technology developed by Rover and applied to some high performance variants of the companies K Series 1800cc engine.In order to improve the optimisation of the valve timing for… …   Wikipedia

• Variable Valve Event and Lift — Nissan Variable Valve Event and Lift (commonly known as VVEL) is an automobile variable valve timing technology developed by Nissan. Nissan VVEL was introduced with the Nissan VQ Engine VQ37VHR in 2007 on the Infiniti G37. VQ37VHR motor specs: 11 …   Wikipedia

• Variable Valve Timing and Lift Electronic Control — VTEC (Variable Valve Timing and Lift Electronic Control) ist eine 1983 für Motorräder eingeführte Technik der Firma Honda zur variablen Ventilsteuerung in Motoren. Inhaltsverzeichnis 1 Zweck des Systems 2 Varianten 2.1 DOHC VTEC 2.2 SOHC VTEC …   Deutsch Wikipedia

• variable valve actuation — In older engines, the intake and exhaust valves operated in a fixed program of timed openings and closings. With variable valve actuation, these actions are varied for a better balance of low speed, medium speed, and high speed operation …   Dictionary of automotive terms

• Continuous variable valve timing — offers a unique ability to have independent control of the intake and exhaust valves in an internal combustion engine. For any engine load criteria, the timing of intake and exhaust can be independently programmed [1]. The main variations of… …   Wikipedia

• variable valve timing — Through the use of computers, the precise time when the valves open and close can be altered. It may be better to change the timing slightly when the engine is at a higher RPM than when it is slower …   Dictionary of automotive terms

• Variable displacement — is an automobile engine technology that allows the engine displacement to change, usually by deactivating cylinders, for improved fuel economy. The technology is primarily used in large, multi cylinder engines. Many automobile manufacturers have… …   Wikipedia

• Variable Cam Timing — Variable Camshaft Timing (VCT) is an automobile variable valve timing technology developed by Ford. It utilizes electronically controlled hydraulic valves that direct engine oil into the camshaft phaser cavity. These oil control solenoids are… …   Wikipedia

• Variable compression ratio — is the technology to adjust internal combustion engine cylinder compression ratios on the fly. This is done to increase fuel efficiency while under varying loads. Higher loads require lower ratios to be more efficient and vice versa. Variable… …   Wikipedia