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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Advice on a non-rotating pushrod
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<blockquote data-quote="Tom Gaynor" data-source="post: 3558" data-attributes="member: 4034"><p><strong>Answer for real rocker</strong></p><p></p><p>Oil has to be conveyed to the timing side mainshaft somehow, and since the shaft rotates, and the castings don't, a seal needs to be contrived between the two. Most manufacturers used a seal that bore on the outside of the shaft (like the BSA Gold Star). Irvine used the considerably more elegant method of injecting the oil via a quill that, because it didn't touch anything, had zero friction, and zero wear. He "threaded" the outside of the quill so that oil trapped inside the gap would move towards the big-end, not away from it. This idea, known later as a labyrinth seal, was adopted by those no-hopers Yamaha to isolate the crank-chambers on their unsuccessful TZ series of racers.........</p></blockquote><p></p>
[QUOTE="Tom Gaynor, post: 3558, member: 4034"] [b]Answer for real rocker[/b] Oil has to be conveyed to the timing side mainshaft somehow, and since the shaft rotates, and the castings don't, a seal needs to be contrived between the two. Most manufacturers used a seal that bore on the outside of the shaft (like the BSA Gold Star). Irvine used the considerably more elegant method of injecting the oil via a quill that, because it didn't touch anything, had zero friction, and zero wear. He "threaded" the outside of the quill so that oil trapped inside the gap would move towards the big-end, not away from it. This idea, known later as a labyrinth seal, was adopted by those no-hopers Yamaha to isolate the crank-chambers on their unsuccessful TZ series of racers......... [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Advice on a non-rotating pushrod
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