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Originally Posted by 304065
I think the issue is in the measurement setup. I mean, if you had somebody machine the case, part of the process is checking your work afterward. Who did the machining?
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The machine work was done by Ollie in Arizona. They only did the boring of the case to 109mm
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How did you mount the bridge?
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I used a dial indicator mounted in a bridge, with this I could get consistent measurements even after rotating the crank and resetting tdc for each cylinder.
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Where did you measure? I assume the JEs have a ring around the outside of the piston. Or did you measure to the top of the crown and subtract the dome height as furnished by JE?
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JE's have the ring around the outside of the piston, like others. I measured along the centerline of the pins. I was able to determine centerline by rocking the piston and having the measurement not move while the dial indicator was in place.
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How did you zero the indicator, how did you establish that you were at TDC when you zeroed?
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I zeroed the indicator while on the bridge on a window. I tested this by zeroing, measuring a known thickness on a flat surface (feeler gauge) resetting the gauge, re zeroing and repeating. This gave me confidence that the gauge was truly zeroed.
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What kind of clock, digital or analog?
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Digital gauge, sure made it easy for zeroing and measuring actual heights.
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Not trying to grill you but I would double check the metrology of the deck height measurement before moving on to the rods.
Craig Garr machined up a steel checking bar that mounted in the mains for checking spigot height, I think there is a photo in the forum.
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Grilling is good, your comments have made me go back and redo them more than once, I have now measured the heights at least 5 times for each piston. This really made me check my methodology to ensure what I was measuring was being accurately measured and consistent.
I will see if I can find the pic of the bar, otherwise I will pick myself up a starret straight edge