Re: engine oil question

Posted by RAB on April 01, 2006 at 22:37:50 from (195.93.21.42):

In Reply to: engine oil question posted by in sticks on April 01, 2006 at 17:11:36:

Not quite. Only keeps relatively harmless carbon particles in suspension. You still need a filtration system. Detergent oils keep engine clean due to non build up of varnishes and other products of combustion or degradation of oil. Piston rings do not gum up and stick in the pistons with detergent oils.
On a perfect engine you do not need an oil filter, but that never happens(?), or would you take the chance of a nasty lump of very hard material (metal) continually circulating until it runs out one or all bearings.
Filters do not remove all oil contaminant particles. Some are better than others, but most will only trap down to a few microns (or filter would clog vey quickly and oil circulation would reduce or perhaps bypass the filter).
The best option is a full-flow to remove danger size particles and a bypass filter (a few % of total oil flow above a minimum pressure limit) to remove sub-micron particles.
BTW for the non Greeks, a micron is a millionth of a metre, or a thousandth of a millimetre. There are 25.4 millimetrs in a US inch (we only use inches for bulding models of old steam engines etc now).
Regards, RAB
I am awaiting any comments that the Greeks did not use the metre as a measurement of length!

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