Re: New Vehicle Oil Change?


"Jeff" <kidsdoc2000@xxxxxxxxxxx> wrote in message
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Ray O wrote:
"Jeff" <kidsdoc2000@xxxxxxxxxxx> wrote in message
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<...>

How, exactly? I would think that the cross hatches cause the piston
rings to rotate slightly as the pistons go up and down. I would imagine
this helps them get seated properly. I understand your explanation
below, but what exactly seat properly mean? I would think it means that
the rings are fully expanded against the cylinder walls, so that there
is not a gap that the gases (both exhaust and unburned gases during the
compression stroke). Is this correct?

The cross hatches might make the rings rotate if they were in a spiral
shape, but since they go in two directions, the rings don't rotate.
Also, the compression from the gases expand the rings and force them
against the cylinder walls, and the pressure keeps them from rotating.

Thanks for the reply.

I didn't mean that the rings would rotate in a circle, but rather, move
back and forth. I bet around 1990, there was some really interesting
engineering and computer modeling that went on to understand this.

Jeff

The cross-hatch forms a series of square or diamond-shaped ridges, kind of
like the pattern on a file. The left and right angles theoretically exert
equal force on the rings, preventing movement, kind of like the bow of a
boat pushing through the water.

--

Ray O
(correct punctuation to reply)


.

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