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The later VR6 engine designs with 24 valves (four per cylinder) had two overhead camshafts as well, however with a slight change of operation principle: In the 24 valve engine all intake valves are operated by the front camshaft (with the aid of rockers), while all the exhaust valves are operated by the rear camshaft (again with rockers).This operating principle is more akin to a double overhead camshaft (DOHC) design, with one camshaft for intake valves, and one for exhaust valves.VR6 engines, and the later VR5 variants, are a family of internal combustion engines, characterised by a narrow-angle (10.5° or 15°) V engine configuration.Developed by the Volkswagen Group in the late 1980s, evolutions of these engines are still produced by them.The Volkswagen VR6 was specifically designed for transverse engine installations in front-wheel drive vehicles.

The "Vee" angle is 15°, and the compression ratio (CR) is 10:1.The VR6 arrangement needs two overhead camshafts to drive all the valves, regardless of whether the engine has two valves per cylinder, or four per cylinder.This simplifies engine construction and reduces costs.In early VR6 engines with 12 valves (two per cylinder) two overhead camshafts were used.The forward camshaft (in the transversely mounted engine) has six cam lobes to control the three intake and three exhaust valves of the front cylinder bank, without using rockers.

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