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- Jun 2, 2003
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Does this seem like a fairly complex system, or is this "normal" in other engines, too? These are the components that regulate oil pressure in my V6 Audi engine:
The oil pump is capable of putting out 200 psi.
Oil pressure relief valves:
- 16 bar (232 psi) in oil pickup assembly
- 11 bar (160 psi) safety valve, only opens at high RPM and cold engine temp
- Pressure relief valve in the oil pump
- one pressure valve on each head. Those control top-end oil pressure.
- Two oil check valves in the steadying chamber (under the valley pan), but those don't really do much in terms of pressure control; they just keep oil in the lifters when you shut the engine off.
There's also some pressure control done by the head gasket - each one has a finely-tuned obstruction to oil flow that maintains oil pressure in the engine block when the oil pressure relief valves are open.
The oil pump is capable of putting out 200 psi.
Oil pressure relief valves:
- 16 bar (232 psi) in oil pickup assembly
- 11 bar (160 psi) safety valve, only opens at high RPM and cold engine temp
- Pressure relief valve in the oil pump
- one pressure valve on each head. Those control top-end oil pressure.
- Two oil check valves in the steadying chamber (under the valley pan), but those don't really do much in terms of pressure control; they just keep oil in the lifters when you shut the engine off.
There's also some pressure control done by the head gasket - each one has a finely-tuned obstruction to oil flow that maintains oil pressure in the engine block when the oil pressure relief valves are open.