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a new version of Honda's vtec which incorporates a camshaft "phaser" on the intake cam only. This allows the computer (or tuner if k-proed) to advance the intake cam from 0 degrees up to 50 degrees before TDC (BMW's system = 5 degrees). [Basically] you can achieve optimum valve overlap for any rpm at any MAP sensor value, which [significantly] reduces emissions, increases gas mileage, and increases torque + power. Under certain [circumstances] (cold engine, malfunction, etc.) the computer will lock the cam in the 0 degree position.
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