Self-Study Programme 248 The W Engine Concept - VolksPage.Net

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14 Engine mechanicals The crankshaft drive The offset The cylinders of a bank are offset in a tandem arrangement and positioned at a very narrow angle of 15°. The compact W engine was made possible by arranging two banks at an angle of 72°. To provide adequate space for the pistons in the bottom dead centre range, it was necessary to offset the crankshaft drive. This means that the cylinders are offset by 12.5 mm outwards relative to the centre of the engine (crankshaft fulcrum). The crank pin offset A constant spark gap is maintained by the crank pin offset, or what is known as the 'splitpin'. The layout of the W engine is based on a 10cylinder engine. All cylinders in a 4-stroke engine fire within a crank angle of 720°. W10 engine 720° crankshaft : 10 cylinder = 72° bank angle W8 engine 720° : 8-cylinder = 90° spark gap 72° bank angle - 90° spark gap = Splitpin -18° W12 engine 720° : 12 cylinder = 60° spark gap 72° bank angle - 60° spark gap = Splitpin +12° Centre of cylinder Centre of cylinder 15 Offset 12.5 mm left S248_186 8 2 11 5 W12 engine 1 7 12° 21.833° Offset 12.5 mm right 6 12 3 9 4 10 Middle of crankshaft Point of intersection of centres of cylinders S248_026
The engine in detail To familiarise you thoroughly with the mechanical construction of the W8 and W12 engines, we will now describe the main modules of both engines in succession. The following topics will be dealt with: - the crankcase with bearing support, - the crankshaft with conrods and pistons, - the balancing shafts, - the cylinder heads, - the oil sump and oil pump, - the crankshaft drive, - the timing chain drive, - the belt drive for auxiliary components and - the multi-part intake manifold W8 engine S248_025 the multi-part intake manifold the cylinder heads the crankshaft with conrods and pistons the crankcase with bearing support the split oil sump with oil pump. 15
Page 1 and 2: Service. Self-Study Programme 248 T
Page 3 and 4: At a glance Introduction . . . . .
Page 5 and 6: The W principle To illustrate the p
Page 7 and 8: The modular design principle of the
Page 9 and 10: Comparing the 12-cylinder crankshaf
Page 11 and 12: S248_018 Engine code BDN Dimensions
Page 13: S248_020 [Nm] 800 700 600 500 400 3
Page 17 and 18: The crankcase lower section The cra
Page 19 and 20: Conrods and pistons S248_016 Trapez
Page 21 and 22: There is a groove at the gear wheel
Page 23 and 24: Two-mass flywheel S248_061 A spring
Page 25 and 26: The 4 valves in each cylinder are a
Page 27 and 28: The secondary air ducting system Be
Page 29 and 30: The camshaft timing control Like th
Page 31 and 32: Retard adjustment The solenoid valv
Page 33 and 34: In the W12 engine, the hydraulic be
Page 35 and 36: Schematic diagram of the oil circui
Page 37 and 38: The oil circuit based on the dry-su
Page 39 and 40: The oil pump is mounted from below
Page 41 and 42: Lubrication of the conrod bearings
Page 43 and 44: Coolant circuit of W12 engine Right
Page 45 and 46: Coolant pump with pump gear S248_11
Page 47 and 48: W12 engine Intake manifold upper se
Page 49 and 50: W12 engine Diaphragm valve, right O
Page 51 and 52: Tailpipes Rear silencer Exhaust sys
Page 53 and 54: Liquid gaskets Application of the l
Page 55 and 56: Place the copper coloured chain lin
Page 57 and 58: Notes 57
Page 59 and 60: 5. Why does the W8 engine have a ba
Page 61 and 62: 13. Which of the following statemen
Page 63 and 64: 14.) a 13.) a 12.) b 11.) a, c 10.)

Self-Study Programme 248 The W Engine Concept - VolksPage.Net

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