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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Torque Plates and Cylinder Honing
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<blockquote data-quote="Magnetoman" data-source="post: 125361" data-attributes="member: 2806"><p>For someone at your machine shop to have made that statement can only mean they've never measured the distortion with and without a torque plate. </p><p></p><p>I made torque plates for my all-iron 1928 Ariel and for my Gold Star engines. Even for the all-iron engine the torque plate made a significant difference at the top of the cylinder where combustion pressure is highest and where you would like the cylinder to be round. While there are other things of greater importance, I don't see that as a reason for your machine shop to ignore something that makes measurable difference. Especially since it is equally difficult to hone a cylinder whether it has torque plates attached or not. </p><p></p><p>I didn't quote measurements above because I didn't take the time to look them up, but I have notes of everything.</p><p></p><p>There are four abrasive shoes and four guide shoes, the hone is only used to remove the final few thou. after boring the cylinder, and the total of eight shoes and stones are in contact with nearly 25% of the circumference during the honing. </p><p></p><p>I have a Sunnen hone with an AN 600 that I use on motorcycle cylinders. I have a three-point bore gauge that reads to 0.0001" and on the Gold Star cylinder I finished a few weeks ago I measured the bore every 1" along the length to see the effect of the torque plates. If there had been a roundness issue caused by the hone I certainly would have detected it.</p></blockquote><p></p>
[QUOTE="Magnetoman, post: 125361, member: 2806"] For someone at your machine shop to have made that statement can only mean they've never measured the distortion with and without a torque plate. I made torque plates for my all-iron 1928 Ariel and for my Gold Star engines. Even for the all-iron engine the torque plate made a significant difference at the top of the cylinder where combustion pressure is highest and where you would like the cylinder to be round. While there are other things of greater importance, I don't see that as a reason for your machine shop to ignore something that makes measurable difference. Especially since it is equally difficult to hone a cylinder whether it has torque plates attached or not. I didn't quote measurements above because I didn't take the time to look them up, but I have notes of everything. There are four abrasive shoes and four guide shoes, the hone is only used to remove the final few thou. after boring the cylinder, and the total of eight shoes and stones are in contact with nearly 25% of the circumference during the honing. I have a Sunnen hone with an AN 600 that I use on motorcycle cylinders. I have a three-point bore gauge that reads to 0.0001" and on the Gold Star cylinder I finished a few weeks ago I measured the bore every 1" along the length to see the effect of the torque plates. If there had been a roundness issue caused by the hone I certainly would have detected it. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Torque Plates and Cylinder Honing
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