Posted by Janicholson on March 08, 2009 at 14:49:22 from (199.17.55.138):
In Reply to: Re: piston clean up posted by sflem849 on March 08, 2009 at 10:18:51:
Knurling a piston is a method of bringing the skirt and below the compression ring lands to a larger size. It is done with a piston knurling tool. This machine indents the skirt with a sharp edged rotary tool that imprints a series of parallel lines on the metal. It displaces the material, and some of it expands the edges of the groove. It is similar to the handle of a SK ratchet. But usually not compound, or as close together. It can increase a piston .008" and it lasts well because the ridges formed are well oiled. Not a good thing to do to a high performance engine, but it is/was common practice. JimN
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Today's Featured Article - The Cletrac General GG and the BF Avery A - A Bit of History - by Mike Ballash. This article is a summary of what I have gathered up from various sources on the Gletrac General GG and the B. F. Avery model A tractors. I am quite sure that most of it is accurate. The General GG was made by the Cleveland Tractor Company (Cletrac) of Cleveland, Ohio. Originally the company was called the Cleveland Motor Plow Company which began in 1912, then the Cleveland Tractor Company (1917) and finally Cletrac.
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