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Variable Intake Manifold

The air required for combustion in the engine flows through the variable intake manifold to the intake valve. The length of the intake manifold is subject to variable – and in fact conflicting – demands at different engine speeds. Only by varying this length can the highest possible air inflow rate and good cylinder filling be achieved at all engine speeds. While the priority at low revs is to deliver torque as rapidly as possible – best attained by means of a long intake manifold – the need for maximum power output at high revs demands short intake manifolds. The variable intake manifold features an electronically controlled flap system that meets both those demands, channelling the air via the long intake manifold at low revs and through the short section at high revs.