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

More documents

Recommendations

Info

36 Engine mechanicals The oil circuit based on the wet-sump principle The W8 and W12 engine for VW models have a wet-sump lubrication system. The W12 engine for Audi models has a dry-sump lubrication system. Wet-sump lubrication system of the W8 engine Oil filter and cooler module Single-stage oil pump In the case of the wet-sump lubrication system, the entire oil supply is retained in the oil sump. The single-stage oil pump draws the oil out of the wet sump via the intake line and immediately returns it to the engine after it has cooled down and has been filtered. S248_084 In contrast to the dry-sump, the job of the oil sump with wet sump is to retain the entire oil supply. As a result, it has a larger volume which affects the overall height of the engine.
The oil circuit based on the dry-sump principle Dry-sump lubrication system of the W12 engine in the Audi A8 Reservoir Three-stage oil pump Filter S248_088 In the case of the dry-sump lubrication system, the entire oil supply is retained in an additional, external reservoir, and not in the oil sump. To facilitate this, the oil pump is of three-stage design. Two stages draw the oil out of the oil sump at various points and pump it into the reservoir. Cooler The third stage (discharge stage) returns the oil from the reservoir to the engine via the oil cooler and the oil filter. The oil sump can be kept small and flat due to its lower oil volume, with the result that the engine has a smaller overall height. This requires a slightly more complex design. 37
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 and 14: S248_020 [Nm] 800 700 600 500 400 3
Page 15 and 16: The engine in detail To familiarise
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: Schematic diagram of the oil circui
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

Create successful ePaper yourself

Delete template?

Save as template?