It is more efficient than the older multiple belt system and may consume less space in the engine compartment. Some vehicles use two serpentine belts for their system, such as the manual transaxle equipped Ford Taurus SHO, 1995–1999 DOHC Nissan Maxima, vehicles using the supercharged GM 3800 engine, and many BMWs. This is typically limited to components requiring less torque or where a large angle of wrap is present. On some engine designs, the "back" (smooth side) of the belt may drive some accessories. To accommodate this bidirectional flexing while remaining strong enough to transfer the total force required by multiple loads, a serpentine belt is almost always of multi-groove (multi-vee, poly-v, or multi-rib) construction. To allow the belt to pass over more than three pulleys with a large enough wrap angle to avoid slipping, idler pulleys which press against the back of the belt are included, forcing the belt into a serpentine shape. The belt may also be guided by an idler pulley and/or a belt tensioner (which may be spring-loaded, hydraulic, or manual). Automotive engine belt Serpentine belt (foreground) and dual vee belt (background) on a bus engine Belt tensioner providing pressure against the back of a serpentine belt in an automobile engineĪ serpentine belt (or drive belt ) is a single, continuous belt used to drive multiple peripheral devices in an automotive engine, such as an alternator, power steering pump, water pump, air conditioning compressor, air pump, etc.
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