W ENGINE

W ENGINE

                                                            

                              With rising demands of power, better performance & fuel economy in automobile vehicles, engineers do many research & finally they got success in the form of a new breed of engines the ‘W Engines’. The constantly rising demands regarding performance, running comfort and fuel economy have led to the advancement of existing drive units and the development of new drive units. The new W8 as well as the W12 engines are representatives of a new engine generation - the W engines. Large numbers of cylinders were adapted to the extremely compact dimensions of the engine. In the process, more attention was paid to lightweight design.              With the aim of building even more compact units with a large number of cylinders, the design features of the V and VR engines were combined to produce the W engines. As with the V engines, the cylinders are distributed to two banks. In the W engines, these banks of cylinders are aligned at a V-angle of 72° in relation to one another. When the W engine is viewed from the front, the cylinder arrangement looks like a Double-V. Put the two Vs of the right and left cylinder banks together, and you get a W. This is how the name "W engine" came about. With the aim of building even more compact engines with a large number of cylinders, the design features of V and VR engines were combined to produce w engine.

VR ENGINE

  The need for a powerful alternative for a transverse mounting for use in small to mid-size vehicles. Six cylinders, offset at v angle of 15 degrees, are accommodated in a fairly slender and very short engine block.

W ENGINE

As with V engine the cylinders are distributed into two banks and in the VR engine, the cylinders within each bank maintain a V angle of 15 degrees.in the W engines, combination of two “VR Banks” of cylinders are aligned at a V angle of 72 degrees in relation to one another.in the evolution of 6 Cylinder engine, the VR6 engine stand out due to its compactness. It is much shorter than the comparable inline engine. Combing two VR6 engines with a cylinder angle of 72 Degrees produce aW12 engine. A W16 engine is obtained by joining two cylinders to each cylinder bank of a W12 engine. Splitting the W16 in the middle leaves two W8 engines. A W10 engine consist of two VR5 engines is also a possibility. This covers the complete range of W engine.

Comparison between V & W engines

When a conventional 8-cylinder V engine of comparable displacement is compared to an 8-cylinder W engine. The latter particularly stands out due to its compact design and relatively small external dimension. This also reflected in the comparison of crankshafts. The compact design of the 12-cylinder W engine is highlighted by the fact that it has even smaller external dimensions than a conventional V8 engine. Depending upon the number of cylinders, the W principle therefore saves material and weight.

  W engine Components

1. Cylinder block

2. Crank case lower section with bearing support

3. Crank shaft with connecting rod and 
piston

4. Balancing shaft

5. Cylinder head

6. Oil sump and oil Pump

7. Crankshaft Drive

8. Timing chain drive

9. Belt drive for auxiliary components

10. Multi part intake manifold

    The crank shafts are of manufactured from forged tempered steel. Each pair of connecting rods runs between two main bearings. The drive gear of the oil is pressed against the outer main bearing and held in place by the vibration damper. The connecting rods are made of forged steel and are only 0.512 inch (13 mm) thick. They are of a trapezoidal construction and are cut during the production process. To ensure better oil exchange, two grooves are milled in the side faces of the connecting rod bearing caps. The W8 engine has two balancing shafts to compensate for the forces of inertia. The two shafts are housed in the crankcase. The upper balancing shaft is driven by the crankshaft and a toothed belt. There is a groove at the gear wheel end of the balancing shaft. Each of the cylinder head in the two W engines has an intake camshaft and an exhaust camshaft with camshaft adjusters attached to their end faces. Due to the cylinder arrangement, short and long valves as well as short and long inlet and exhaust ports alternate with one another

ENGINE LUBRICATION

     The oil is guided from the central oil passage of the crankcase upper section to small nozzles at the base of the cylinder bores. Here the oil sprayed below the pistons to lubricate the piston contact faces and piston pins, and cool the pistons. The oil is routed through holes from the central oil passage to the crankshaft. Then it is forced through grooves in the backs of the lower bearing shells to the upper bearing shells.