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Old 12-17-2002, 06:38 PM
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I got to do a report on engine modifications and I am at the point where i am discribing cylinder boring well this is my question How is it done i got books all over the place and it shows honing ...is this the same thing as boring the cylinders?????

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Old 12-17-2002, 07:09 PM
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No, it's not. Honing is done after the cylinder is bored out. First the block is leveled on a mill. Then, after establishing how much material is to be removed, the boring bar is touched off from the cylinder and adjusted out (usually .030 of an inch). The mill is turnned on and the boring bar is fed into the cylinder. Most modern engine mills use an auto feed. For more information look into machining, boring, and milling. After the cylinder is bored out, a hone is put into the mill and fed up and down the bore to create a cross hatch pattern on the cylinder wall. I hope I've answered your question. I'm not an automotive machinist, I'm and aerospace machinist, but the process to bore a hole to a specific size is the same in all machining.
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Old 12-17-2002, 07:12 PM
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Boring is done by a boring bar, to bore a cylinder is to increase it`s size in thousanths, like 10, 20, 30, 40, 60 or more depending on the block. this also increases displacement. to hone the cylinders is to make the final demensions to match the pistons in most cases, and also and most importantly, to match the finish for the type of rings used, different rings need a different finish for optimum ring seating.
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Old 12-17-2002, 07:31 PM
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The first couple of replies are correct. The reason you are finding honing procedures is this can be done by the Doityourselfer, at home. Boring requires a trip to a qualified machine shop. That's why there isn't much how to info on boring.
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Old 12-17-2002, 07:47 PM
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thanks alot guys I see now...thats what I had in mind actually .. the pics deffinatly did not look correct to me..
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