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Where do you suppose the debris in the pictures showing the removable plate with very clean oil come from? That's after the engine had already gone through pan drop, replacement (with the modified pan), engine flush, full synthetic oil change, then 3-5000 miles of distance of driving.
A word on "synthetics," most varieties of "full synthetic" oil is actually 100% refined from dyno oil because most varieties use Shell Rotella stock. Mobil 1 "full synthetic" (mostly PAO, which is indeed synthesized) can still have as much as 20% dyno oil as carrier oil for additives. Check out this link: "http://www.synlube.com/oilv.htm"
As for the turbine, obviously the hottest part of the turbine is at the bearing . . . and that focal heat point is the result friction at 10+k rpm. That's the friction between the oil molecules against the metal surface; any metal-to-metal contact would be instant death for the turbine. So yes indeed the oil molecules (tiny oil balls) passing through the turbine do indeed experience that extremely high temperature for a very transient amount of time. That's how turbines work, and why ball bearings even made of tungsten is not used there: tungsten balls circling being reused there wouldn't survive as well as the rapid pass-through microscopic oil balls can do. Oil molecules / tiny oil balls survive by having to spend very little time there for any particular individual oil molecule/tiny oil ball. However, there is a statistical probability that some oil molecules still get broken up by the heat, and if there is suspended carbon particles in the oil already, then those particles would snowball rapidly both because carbon balls generate more heat than oil balls and the existing surface provide aggregation. Turbine is indeed a statistical/probabilistic game, just like the microprocessors and memory chips in our computers work through probabilistic outcomes (quantum mechanics in the latter case).
What's relevant to us is that turbo (and piston skirt under-spray) do generate carbon particulates (as does ICE chamber combustion itself). There is probabilistic debris accumulation at the bottom of any oil pan in any car. The fine mesh screen in the B235/B205 engines can face a problem in the long run through sheer probabilistic carbon "coffee grounds" accumulated over time. Of course, there is no need to get overly alarmed over it any more than the fact that all animals will die of clogged heart arteries or cell replication error (cancer) if given enough time of nothing else going wrong. I'm simply looking for an inexpensive solution to run the clock out longer. LOL.
posted by 71.184.95...
, Sat, 14 Aug 2010 08:04:17
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