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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Cylinder Liner fit to crankcases
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<blockquote data-quote="The VOC Spares Company Limited" data-source="post: 38318" data-attributes="member: 1603"><p><em>BOB DUNN’S VIEWS ON THE FIT OF THE LINER IN THE CRANKCASEMOUTH</em></p><p><em>Neville Higgins MPH 626 Pae1 17</em></p><p> <em></em></p><p><em>Bob tells me that what happens if you have liners which fit tight into the crankcase mouths (which I thought I liked) is this: </em></p><p><em>1. The liner is round on the outside until you shrink the muff onto it:</em></p><p><em>2. When the muff contracts its irregular section squeezes the liner out of round, inside and outside. Some of this distortion extends below the muff on the liner o/dia.</em></p><p><em>3. You then bore the cylinder, which makes it round (more or less!) all the way through, but the o/d below the muff is still out of round.</em></p><p><em>4. You push the liner down into the close fitting crankcase mouth, which then tries to force the out of round o/d to be round, thus making the formerly round bore squiff shaped.</em></p><p><em>Bob therefore recommends that liners, below the muff, should be 0.005 inch less in diameter than the crankcase mouth into Which they fit, so that they remain round at the bottom of the bores when fitted. His experience is that piston oiling is not critical, and many engines run without it: he uses it himself, but more for piston cooling than for lubrication, so leakage between the liner and the crankcase is not of any real consequence.</em></p><p><em></em></p><p></p><p>I had a long exchange with ONE customer in Australia on this matter whilst he insisted that Phil Irving’s design could not be wrong and I insisted that in light of 60 years of hindsight things will change, we agreed to differ. I was going to put in a comment here about the Irving-Vincent not being the same as B Rapide but changed my mind.</p><p> </p><p>We have sold over 60 liners in the last 2 years 1 complaint, is this a case of “put 3 Vincent owners in room and get 5 options”. </p><p></p><p>Ian Savage</p></blockquote><p></p>
[QUOTE="The VOC Spares Company Limited, post: 38318, member: 1603"] [I]BOB DUNN’S VIEWS ON THE FIT OF THE LINER IN THE CRANKCASEMOUTH Neville Higgins MPH 626 Pae1 17 Bob tells me that what happens if you have liners which fit tight into the crankcase mouths (which I thought I liked) is this: 1. The liner is round on the outside until you shrink the muff onto it: 2. When the muff contracts its irregular section squeezes the liner out of round, inside and outside. Some of this distortion extends below the muff on the liner o/dia. 3. You then bore the cylinder, which makes it round (more or less!) all the way through, but the o/d below the muff is still out of round. 4. You push the liner down into the close fitting crankcase mouth, which then tries to force the out of round o/d to be round, thus making the formerly round bore squiff shaped. Bob therefore recommends that liners, below the muff, should be 0.005 inch less in diameter than the crankcase mouth into Which they fit, so that they remain round at the bottom of the bores when fitted. His experience is that piston oiling is not critical, and many engines run without it: he uses it himself, but more for piston cooling than for lubrication, so leakage between the liner and the crankcase is not of any real consequence. [/I] I had a long exchange with ONE customer in Australia on this matter whilst he insisted that Phil Irving’s design could not be wrong and I insisted that in light of 60 years of hindsight things will change, we agreed to differ. I was going to put in a comment here about the Irving-Vincent not being the same as B Rapide but changed my mind. We have sold over 60 liners in the last 2 years 1 complaint, is this a case of “put 3 Vincent owners in room and get 5 options”. Ian Savage [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Cylinder Liner fit to crankcases
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