11-12-2009, 09:42 AM
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#10 (permalink)
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A True Z Fanatic
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Quote:
Originally Posted by kannibul
Metal shavings...no ****. Physics...man, physics...
Your cylinders are honed into a file-like crosshatch pattern when new, and when the engine is first fired up (with oil in it), they "file" down everything and get the rings seated.
And where do those shavings go? Into the pan, with the oil, that ships with your car that you drain out at your first change, and some shavings stay in the engine because you can't get them all out...so they're there until you're ran enough oil through the engine and filter...
Also numerous cars come with synthetic oil from the factory...nothing wrong with using synthetic from the moment you get a new car home, drop the oil out of the pan, and refill it...
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I think i think you mean physimabullshics
A note on honing: Engine bolcks are bored with indexable carbide boring tools. the finish is WAYYY smoother from this tool than the hones(a proper OEM machining center can achieve a 16 microinch finish on the bore) problem is it isn't perfectly round so manufacturers bust out the hone and get the bores to within .003-.005 of finish size. Now here's the important part after the rough hone they use a finish hone to smooth out the rough hones surface and clean up the walls of cylinders(you have to look through a stereoscope at hundreds of metal samples before you fully understand what i mean when i say that two parts can have identical surface roughness but be totally different). The goal of honing is to create the roughest finish possible while allowing the rings to move freely and seal effectively for the purpose of OIL RETENTION. You have an aluminum block and steel rings chief the rings "seat" in the cylinder walls kinda like breaking the tips off of all of the teeth on your file. the shavings in the oil are all alluminum. Magnetic drain plugs on our cars don't really do much because of this(they do pick up some stuff from the bearing to journal wear, oil pump gears, and the timing set though).
Oems that do use the factory fill of synthetic often use phosphorous and zinc loaded additives in that first batch of oil as well to ease break in. They tell you not to use it afterwards because it tends to have an effect on emissions over time. oil used to be loaded with it in order to lubricate the old flat tappet cams but that too has been cleaned up now to the point where if you own an old 60's era musclecar you should be running special oils or additives as they have been cleaned out of almost all oils on the market.
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