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Old 02-07-2012, 06:28 PM
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Default RE: New (to me) internet myth


AB means that it can be used in both A and B size cylinders...The differences are in the tenths of thousandths, only shows the attention to detail the chainsaw manufacturers go to....A D piston will fit in an A cylinder, but won't run for long....An A piston in a D cylinder is borderline loose....
OK RC, while talking about engine bores .... do quality cylinders have any bore taper? I have to say I've never measured this on any 2 stroke gasser I ever worked on though I do check ring end gap from top to bottom of stroke. I know some full scale aircraft cylinders have a bit of taper to allow for the top of the cylinder running at a higher temperature than the bottom .... theory being that when up to temperature the bore would be straight. Just curious.