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deanfi

Informative article on aircraft engine oil

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Might be better if he knew the difference between tolerance and clearance. He is not alone but they are two entirely different things.. Lots of words and not a lot of real information. The sort of "advertising oils" material common ground with" OUR OIL" does al this (Actually hard to prove).. Cooling your motor with air by running lean of peak is stretching things. I actually wonder what that contentious topic has to do with what oil you use.  Oil doesn't cool things very well. You need a lot of it and special oil jets in turbocharged motors are common to universal.. The main reason for larger running "clearances" on some bearings is to achieve higher oil flows with SOME bearing materials that don't have the best friction co-efficients so need to control the heat build up somehow.. Clunking noises in some larger engines are because of dynamic counterweights on the crankshaft. not CAVERNOUS clearances )not Tolerences)  A tolerance is a max allowed dimensional variation A clearance is what's designed into the motor intentionally as a required to allow for oil flow or metal expansion when running.. Most sludge formation is because of short runs and water contamination where the engine doesn't fully warm up. This WAS covered in the article as far as temps needed was addressed. Longer trips are easier on engines and sitting idle is just what they don't need.. Oil doesn't contain MAGIC. It's formulated for the job it's designed for and all aviation grade oils have to meet a standard so you have some assurance of quality in a world where that is mostly not available. (unfortunately). Nev

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You might want to rethink that, "Oil doesn't cool things very well" statement, facthunter, if you take a look at the Rumely OilPull tractors, built from 1909 to 1930.

These tractors utilised oil for the engine cooling medium, and the oil-cooling of these engines was quite successful. Corrosion is totally eliminated, and the boiling point of oil is much higher than water.

 

https://en.wikipedia.org/wiki/Oil_cooling

 

https://tractors.fandom.com/wiki/Rumely_Oil-Pull

 

I recently purchased a 2005 model Atlas-Copco trailer-mounted compressor for an associate. This unit is powered by a 4 cyl Deutz engine - and the Deutz engine cooling system uses oil as the cooling medium.

 

Engine cooling via oil allows higher engine operation temperatures, for increased efficiency, but the engine must be designed to handle the higher temperatures of oil cooling.

Water cooling is simply cheaper for manufacturers, and this design provides a steady income stream in parts and repairs, as it's reported that around 60% of engine problems are cooling-system related.

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