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In all its simplicity, this throttle used between the blower and intake is largely responsible for the supercharger system's good manners. This setup equalizes vacuum between the top and bottom, allowing the compressor to free-wheel with hardly any parasitic losses at cruising speeds. Approximately 1/4 of a horsepower is lost to belt drive friction, according to Allen, and the blower will turn (on vacuum) without a belt.

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