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The swirl motor, or swirl port motor opens and closes swirl ports in the intake manifold, to take advantage of / and to enable the best air flow characteristics in the intake manifold. From Idle to WOT, air flow characteristics can change in the inlet manifold, designs of inlet manifolds can vary, i.e best air flow characteristics at low speeds, or best air flow characteristics at high speeds. ( a very simple comparison. It is a lot more complex than that, think of porting and polishing heads. this is done to enable the engine to breathe better increasing power, etc. ) The inlet manifold has butterflys that can open and close to take advantage of the way the engine is breathing, regardless of engine speed. A lot of manufactures are now using this technology to make engines more effiecent, powerful, smoother etc etc. Like any other mechanical components, these can wear out, stop working, break, carbon up, the list goes on.
Maybe it could be a one off with your friends car.
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