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Old October 9th 04, 07:27 PM
Anthony
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"John Kunkel" > wrote in
news:gRU9d.217774$D%.77477@attbi_s51:

>
> "Anthony" > wrote in message
> ...
>> >
>> >

>> A certian minute volume of oil is consumed each cycle due to the
>> surface finish on the cylinder wall. It is designed that way. (Ring
>> lubrication).

>
> Depends on what you call "minute", many engines in good condition go
> 5000+ miles with no discernible consumption as gauged by the dipstick.
>
> In high school auto shop I attained the Hasting Piston Rings "Doctor
> of Motors" certificate (I know, big deal). The training taught that
> proper cylinder/ring lubrication can be attained with no loss of the
> lubricant.
>
> The phenomenon was illustrated by placing a hankerchief over a silver
> dollar and placing a lit cigarette (gasp) on the hankerchief. Other
> than a brown smudge, the hankerchief is not burned because the coin
> absorbs the heat; same thing happens in the combustion chamber, the
> heat of combustion passes through the microscopic film of oil without
> burning it away and is absorbed by the mass of the cylinder wall.
>
> If not for this phenomenon, the oil on the part of the cylinder wall
> exposed to combustion heat would be burned away and there would be no
> lubrication for the rings as the piston travels from BDC to TDC on the
> exhaust stroke; ring life would be very short.
>
>
>



By minute, I meant an extremely small amount. There is *some* oil burned,
but you would probably need some pretty sensitive scientific instruments
to detect it.


--
Anthony

You can't 'idiot proof' anything....every time you try, they just make
better idiots.

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