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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
ET77 Main bearing distance piece
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<blockquote data-quote="Big Sid" data-source="post: 36715" data-attributes="member: 2781"><p>The reverse scroll on ET 77 needs to be a fairly close fit within the alloy ring ET 19 for it to function . On new motors it often was actually rubbed as the scroll spun and was designed to sacrifice its surface in this breaking in process . the quality of the alloy in the outer ring is purposely soft enough to easily wear away without seizing . A clever bit of engineering . </p><p> In our Vincati motor this is all modified , the scroll is a polished slick hard surface and the alloy ring carries a double lip seal , the aim is to lessen oil going towards the primary . There is a cupped drilling in the inner primary wall that catches oil an leads it to that left side seal lip , this cools and lubricates it after which it flows back through the big ball race returning to the primary case . </p><p> The other lip is oiled by oil passing the absent scroll from the right side . </p><p> This all allows use of a multiplate to live clutch in its own thin fluid in the chain case . Sid .</p></blockquote><p></p>
[QUOTE="Big Sid, post: 36715, member: 2781"] The reverse scroll on ET 77 needs to be a fairly close fit within the alloy ring ET 19 for it to function . On new motors it often was actually rubbed as the scroll spun and was designed to sacrifice its surface in this breaking in process . the quality of the alloy in the outer ring is purposely soft enough to easily wear away without seizing . A clever bit of engineering . In our Vincati motor this is all modified , the scroll is a polished slick hard surface and the alloy ring carries a double lip seal , the aim is to lessen oil going towards the primary . There is a cupped drilling in the inner primary wall that catches oil an leads it to that left side seal lip , this cools and lubricates it after which it flows back through the big ball race returning to the primary case . The other lip is oiled by oil passing the absent scroll from the right side . This all allows use of a multiplate to live clutch in its own thin fluid in the chain case . Sid . [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
ET77 Main bearing distance piece
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