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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Measuring Pistons
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<blockquote data-quote="vibrac" data-source="post: 176661" data-attributes="member: 60"><p>A heavy initial spate of downsizing followed by an unexpected influx of Vincent parts from an auction, means that I am trying in the best traditions of the Borg* to assimilate a mass into my parts store. This has has lead me to catalog the pistons I have accumulated over the years. Many are in excelent condition cast aside in a mad rush to 90 bores and high racing ratios.</p><p> Now I was always told that you measure pistons across the bore at right angles to the gudgeon (wrist) pin, at the bottom of the skirt. However so far I have measured two emblasoned with <strong>STD </strong>on the crown whose skirts are measuring closer to +40 am I doing it wrongly?</p><p>This is my first foray into measuring pistons normally I would take a barrel and a piston and ask my 'man' to bore to suit the new piston with a clearance (racing 6 thou) however I think I should use some of these lower compression good pistons in my new road twin. Speed for once is not a goal it will mainly be built for.</p><p></p><p>* In Star Treck the Borg are a race of semi automitans who absorb sentinent races and technologies (sorry about that <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite6" alt=":cool:" title="Cool :cool:" loading="lazy" data-shortname=":cool:" />)</p></blockquote><p></p>
[QUOTE="vibrac, post: 176661, member: 60"] A heavy initial spate of downsizing followed by an unexpected influx of Vincent parts from an auction, means that I am trying in the best traditions of the Borg* to assimilate a mass into my parts store. This has has lead me to catalog the pistons I have accumulated over the years. Many are in excelent condition cast aside in a mad rush to 90 bores and high racing ratios. Now I was always told that you measure pistons across the bore at right angles to the gudgeon (wrist) pin, at the bottom of the skirt. However so far I have measured two emblasoned with [B]STD [/B]on the crown whose skirts are measuring closer to +40 am I doing it wrongly? This is my first foray into measuring pistons normally I would take a barrel and a piston and ask my 'man' to bore to suit the new piston with a clearance (racing 6 thou) however I think I should use some of these lower compression good pistons in my new road twin. Speed for once is not a goal it will mainly be built for. * In Star Treck the Borg are a race of semi automitans who absorb sentinent races and technologies (sorry about that :cool:) [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Measuring Pistons
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