Sep 19, 2010 · That is the shops job to fir the bore to the piston. Not saying you shouldnt check, but the piston-to wall clearence is specific to the engine, and not somthing to be estimated. if you arent using Mics to do the measuring and know what you are looking for for measurment, then you are not going to know what you are looking for.
Every few passes with the rigid hone, you measure top, middle, and bottom. You'll know if you're screwing up honing it after every measurement cycle. I bore to within 0.003" of my final piston-to-cylinder clearance calculation, then hone the rest.
Next, enter the measurement designation in either inches, 1, or millimeters, 2. Enter the cylinder bore diameter. Enter the piston stroke length. Click on Calculate Displacement. The value will be returned in CR, Compression Ratio from ALL input values excluding Total Volume. You can also calculate Total Volume from bore, stroke, and CR. Measure and record this solid height, sometimes called stack height (ours is 1.090 inches). Finally, subtract the solid height from the compressed height to find the compressed spring clearance. The result should be at least +.100 inch for optimum reliability.
To set end gap, begin by placing the piston ring in the cylinder. Make sure the marks are facing up just as it would be installed on the piston. Use the piston to make sure the ring is installed straight so you can get an accurate measurement. Now use feeler gauges to measure the distance between the ring's ends.
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