I have used a rigid Sunnen Hone to recondition many blocks where I could get pistons in .010 over the current bore. Many of them were single cylinder Kohler engines from Cub Cadets but I have also taken .020" out of a Ford 391 and .030" from a Chevy 250.
Use coarse stones dry until you are about .002 from the final desired size. Then use a medium stone with oil until you are about .0005 - .001 from the final desired size. Then finish off with the proper fine stones with oil to get the proper piston fit and finish on the cylinder walls.
The most I have taken out is .250" in one cylinder in a Continental engine in a Massey Harris 101 Senior. The cylinder had a crack so I honed it out and pressed in a repair sleeve and then took that sleeve back to standard bore.
My 2444 has .010 over pistons in it since I wanted to leave the cylinders as small as possible to allow for additional overhauls in the future. There was one cylinder that did not clean up completely, there was a spot about the size of a nickle that still showed a bit of wear. I chose to leave it rather than going .020" over. If I had sent the block out to a machine shop I'm sure they would have bored it to .030" and not been concerned about future overhauls.
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Today's Featured Article - Listening to Your Tractor - by Curtis Von Fange. Years ago there was a TV show about a talking car. Unless you are from another planet, physically or otherwise, I don’t think our internal combustion buddies will talk and tell us their problems. But, on the other hand, there is a secret language that our mechanical companions readily do speak. It is an interesting form of communication that involves all the senses of the listener. In this series we are going to investigate and learn the basic rudimentary skills of understanding this lingo.
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