VW AAA VR6 2.8 ENGINE.
VR6 engines are V6 piston engines with a narrow angle between the cylinder banks and a single cylinder head covering both banks of cylinders.
Volkswagen Group introduced the first VR6 engine in 1991 and VR6 engines currently remain in production. From 1997-2006, Volkswagen also produced a five-cylinder VR5 engine based on the VR6.
VW AAA VR6 2.8 ENGINE
The name VR6 comes from the German initials for a V engine (German: V-Motor) and a straight (inline) engine (German: Reihenmotor), therefore the VR engine is described as a "Vee-Inline engine" (VR-Motor).
VR6 engines shares a common cylinder head for the two banks of cylinders. Only two camshafts are needed for the engine, regardless of whether the engine has two or four valves per cylinder. This simplifies engine construction and reduces costs.
Since the cylinders are not located on the centreline of the combined cylinder head, the lengths of the intake and exhaust ports are different for each bank. Without compensation, these varying port lengths would result in the two banks of cylinders producing different amounts of power at a particular engine RPM. The difference in port lengths are compensated for with the length of the runners in the intake manifold, the camshaft overlap and lift profile, or a combination thereof.