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calls their Air
Suction Valve the PAV, or Pulsed Air Valve. Its function is the same, using a vacuum at the intake to trigger a valve that pulses atmospheric air into the exhaust. The original "iron barrel" style engine did this with a hose from the PAV going to the exhaust pipe, the newer
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Used on the Honda Falcon NX4, mainly responsible for backfire or popping during deceleration when an open exhaust is added to the bike and if extra accessories is on vacuum circuit (Scottoiler, etc.).
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and the third is open to the atmosphere. When a negative pulse is induced in the exhaust, air from the atmosphere enters the exhaust manifold through a one-way
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rises and acts against the spring to push the shaft downwards, thereby blocking the opening through which atmospheric air is passed to the exhaust.
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which is attached to the bottom. A manifold vacuum is applied over the diaphragm where the shaft end is towards the opening of the atmosphere.
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This system is mainly used in Indian two wheeler which are manufactured by Hero Honda. The advantage of this system is low cost.
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Though there is a negative pulse during deceleration, the manifold vacuum blocks and cuts off the air to the exhaust manifold.
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are produced during the operation of the cycle by designing it as a
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When an engine exhaust valve is open, the pressure in the
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The ASV has three openings: one is connected to the
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201:This system consists of a spring-loaded
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104:December 2009
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