Re: New Vehicle Oil Change?

Ray O wrote:
"Jeff" <kidsdoc2000@xxxxxxxxxxx> wrote in message news:Xh40k.75$Kw3.6@xxxxxxxxxxx
<...>

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
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