Proper cross hatch in a cylinder, both depth of cut and geometry have a lot to do with ring seal. Chrome faced rings are hard and take some doing to seat, this is where proper bore preparation as far as hone comes into play.
The proper way to measure a bore is with a bore gauge. 90* apart, 3 points down the axis of the bore (top, middle, bottom) for a total of 6 measurements, if you are an overachiever measure 3 points at each height for a total of 9 measurements. It is also important to mic the piston on the skirt to make sure it is not worn. Pistons are not true cylinders but are larger on the skirt.
Proper indexing of compression and oil rings on the piston are of utmost importance.
Oil vapor is almost certainly leakage by the rings.
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Today's Featured Article - Product Review: Electronic Ignition - by Staff. Oil, for example has come a long way in the last 50 years and I don't use anything but the latest API grade available. I've heard the arguments for non-detergent oils but would never trade it for today's formulations. Paint is another, the modern acrylic enamels are great for resistance to grease and fuel stains, retaining their shine and they last forever; unlike enamels and lacquers . Still another is the alternator. No doubt using the original generator keeps the tractor pure, but for thos
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