oil pressure is simple. oil pressure is created by the resistance to flow via bearing clearance and what have you. the pump doesnt create pressure it simply creates a given volume of flow.
How does oil pressure work?
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Originally Posted By: gotib007
Hey, I seem to recall that aircoooled VWs used a piston and spring setup as their oil pressure relief valve, and that you could either vary the spring stiffness or shim up the spring to monkey around with the oil pressure. Am I imagining that?
You are correct. The earlier blocks had a single relief valve in the block to dump
Oil back in the sump when pressure exceeded the spring/pistons specs. Later blocks had a second, smaller spring at the end of the oil stream to relive excess pressure at higher rpms. Although it was a band-aid fix, some people would use washers or stiffer springs to increase oil pressure on these engines. It often led to blown cooler seals and excess oil usage.
Hey, I seem to recall that aircoooled VWs used a piston and spring setup as their oil pressure relief valve, and that you could either vary the spring stiffness or shim up the spring to monkey around with the oil pressure. Am I imagining that?
You are correct. The earlier blocks had a single relief valve in the block to dump
Oil back in the sump when pressure exceeded the spring/pistons specs. Later blocks had a second, smaller spring at the end of the oil stream to relive excess pressure at higher rpms. Although it was a band-aid fix, some people would use washers or stiffer springs to increase oil pressure on these engines. It often led to blown cooler seals and excess oil usage.
I should have stated 'full flow' oil pressure about the Chevys.
I can't believe car engines ran with splash - this really amazes me!
Yes, VWs use a spring and piston to control oil pressure, but so does just about any other car oil pump. Shims and washers were often used to accommodate a weakened spring.The old air cooled VWs' were externally accessible, though.
I can't believe car engines ran with splash - this really amazes me!
Yes, VWs use a spring and piston to control oil pressure, but so does just about any other car oil pump. Shims and washers were often used to accommodate a weakened spring.The old air cooled VWs' were externally accessible, though.
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