Quote:
Originally Posted by Terry Burtz, Calif
That would be like saying the engine cylinder cases (blocks) were bored to 3.8735" in size. While that is accurate statement, that was not the finished bore size after honing.
Per Ford drawing A-6015 (April 1929), the cylinder bore was specified to be reamed to 3.873 to 3.874 inch diameter, and then rolled to 3.875 to 3.876 inch diameter. There is no mention of boring or honing.
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True Terry about the reaming, and maybe I am looking at it in a different manner of terminology (then & now) that boring and reaming can be synonymous in meaning. I guess the way I also look at it is that on the print, it also mentions finish sizes of other bearings or bores but really does not tell you how to get there. I think much of that came from common sense and SOP from the Machine Shop employees who just knew what was necessary, and that knowledge was passed down to the apprentice machinists that came thru the factory. One "other final" thought of mine is while using a reamer will put you to an exact size, it will not produce a surface finish conducive for a cast iron piston ring. Therefore they had to grind (-or hone) to finish size. Am I still missing something??