Quote:
Originally Posted by Logic
Not real piston rings but whats interesting here is you can see the blowby in the circumferential movement in the oil between each ring.
Faster between the top and middle ring than between the middle and lower ring.
So I went and looked for research.
Consequence of Blowby Flow and Idling Time on Oil Consumption and Particulate Emissions in Gasoline Engine
1.2l 3cyl 4-stroke Blowby flow measurement for the engine at full load.
rpm l.min−1
1000 31
1500 52
2000 51
2500 52
3000 51
3500 49
4000 49
4500 49
5000 51
5500 49
6000 47
https://www.mdpi.com/1996-1073/15/22/8772
The paper shows it's important to have the ring gaps 180 degrees from each other too.
How long and if they will stay that way I don't know.
Assuming a 0.5 micron thick layer on metal surfaces, you lose 2 microns (0.002 mm) of space between piston and sleeve,
And 0.007mm off the ring gap of the 75mm bore of the engine used above.
I don't think that would make much difference to blowby, but don't know enough on the subject to judge..?
Interesting non the less. |
"...it is common knowledge that water
molar concentration is 14%..."
https://www.researchgate.net/publica...ection_Systems
I take that to means that 14% of the above numbers is water vapour, so numbers for water vapour and water going through the crankcase are:
rpm l/min Steam l/min Water ml/min if condensed
1000 31 4.34 2.71
1500 52 7.28 4.50
2000 51 7.14 4.46
2500 52 7.28 4.50
3000 51 7.14 4.46
3500 49 6.86 4.28
4000 49 6.86 4.28
4500 49 6.86 4.28
5000 51 7.14 4.46
5500 49 6.86 4.28
6000 47 6.58 4.11
(I wish extra spaces weren't ignored so I could make a proper table?)
How much of that ends up dissolved and/or as an emulsion in the engine oil with small amounts of hygroscopic (water absorbing) Boric Oxide in it; I don't know, but there are some 'negligible' numbers to consider.
ie: Any Boric Oxide scraped of the barrier that forms on metal surfaces would quickly? become BA again.
That BA would then 're-patch the scratch'.