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Determining 4 mil crank


ETR174

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Some folks will talk shit, but you're ahead then a few fellas lately by at least using a decent way of measuring. Your numbers are fudged though. That only shows a 48mm stroke.

 

Get the piston at BDC shove the caliper slide pin all the way down till it hits the piston. Now slowly rotate the flywheel till the piston comes all the way up. Even if it goes past TDC the caliper should stop at the highest point. Subtract the difference. You need to make sure the caliper isn't wiggling though.

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Get the piston at BDC shove the caliper slide pin all the way down till it hits the piston.Zero your calipers if you can. Now slowly rotate the flywheel till the piston comes all the way up. Even if it goes past TDC the caliper should stop at the highest point.  You need to make sure the caliper isn't wiggling though.

This method will be simpler.

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