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In internal combustion engines, a variable-length intake manifold (VLIM),variable intake manifold (VIM), or variable intake system (VIS) is an automobile internal combustion engine manifold technology. As the name implies, VLIM/VIM/VIS can vary the length of the intake tract - in order to optimise power and torque across the range of engine speed operation, as well as help provide better fuel efficiency. This effect is often achieved by having two separate intake ports, each controlled by a valve, that open two different manifolds - one with a short path that operates at full engine load, and another with a significantly longer path that operates at lower load.
There are two main effects of variable intake geometry:
Many automobile manufacturers use similar technology with different names. Another common term for this technology is variable resonance induction system (VRIS).
Mazda, General Motors, Ford Fiesta, Henry Ford, Detroit
Formula One, Fiat Chrysler Automobiles, Scuderia Ferrari, Pininfarina, Alfa Romeo
Porsche, Formula One, Variable valve timing, Aluminium, Ferrari
English language, Operating system, Cross-platform, Distributed resource manager, Free software license
Redline, Cars, Turbocharger, Combustion chamber, Stratified charge engine
Torque, Redline, Cars, Cold air intake, Head gasket
Redline, Cars, Cylinder (engine), Compression ratio, Engine displacement
Redline, Cars, Top dead centre, Ignition system, Crankshaft
Internal combustion engine, Cold air intake, Redline, Cars, Automobile