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Doing an overhaul on my 4.0L I6 jeep motor because a piston skirt went in the first cylinder. I bought new pistons and rings for the factory bore because my cylinders had no damage or marks on the wall. My understanding is that I need to chamfer the top of the cylinders for the new rings but I’m not honing the cylinders so it seems strange that I would pretty much widen the cylinder at the top more and the remaining part of the cylinder wall would stay the same. I’ve heard that this can all really be done by sandpaper but I’m not sure if there’s even any point in doing this. I don’t want to spend another couple hundred bucks to buy biger pistons if I change the size of the bore. What should I do?
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The point of the chamfer is so that the rings can slide into the cylinders with out binding up on the sharp edge of the cylinder.
Also in some cases ….
A sharp edge on the cylinders can lead to pinging or detonation as the little tip of the edge will heat up and not cool down to below detonation temp between firing strokes.
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