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Proposed is a dual-viscosity oil consisting of two partially
immiscible components. One component "A" has a high mass
density and a low viscosity. A second component "B" has a
lower mass density and a higher viscosity. When the engine
is cold, fluid "A" rests on the bottom and covers the pump
siphon tube. Fluid "B" floats above fluid "A". On startup, fluid
"A" travels into the oil pump and quickly circulates in the
engine. A few seconds later, fluid "B" is mixed with fluid "A"
in a quasi-equilibrium state while the engine is running. This
setup prevents metal-to-metal contact by achieving a high
flow rate at startup and a high load capacity when the engine
is warm.
Two-stroke Oil
http://en.wikipedia...wiki/Two-stroke_oil
Mix your lubrication in with the fuel. [zen_tom, Apr 19 2012]
[link]
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Isn't this what you do when you mix two-stroke oil with fuel in order to power smaller petrol engines? [edit] Actually no, rereading; I see there's a difference in having a dual-viscosity oil in the sump, and mixing it into the fuel. |
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[+] You could switch to oil 'B' completely when the engine's warm. |
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I had thoughts like that: "powered" by having a vacuum in the crankcase while the engine's running: thin oil evaporates out (as well as blowby which is removed) and is sequestered separately until the engine cools down. Later when the engine's stopped, the thick oil congeals on the parts rather than dripping off and the thin oil is returned to the crankcase. So the startup lubrication consists of oil already on the parts and thin oil which moves around quickly. |
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>I see there's a difference in having a dual-viscosity oil in the sump, and mixing it into the fuel. |
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I think you might be closer to the truth than you think, petrol has a very low viscosity. |
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This is interesting, but how do you check the oil level?I suppose
the low density oil will be lost at a higher rate. |
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Isn't this the principle behind existing blended motor
oils, 10W-40 for instance, with added immiscibility of
oils*? |
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*Difficult unless you've figured out a way to change
the polarity of oil. A polar liquid will almost always be
miscible with another polar liquid; a non-polar with a
non-polar. |
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So, an emulsifier? No... seems it's more like a
thixotropic agent, activated by temperature. Wow!
Oil is a form of custard! |
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