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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Cylinder Liner fit to crankcases
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<blockquote data-quote="Big Sid" data-source="post: 38302" data-attributes="member: 2781"><p>On liner fits . And source . Our experiance with marvelous machining by Bill Jean . We obtain oversize liners from Coventry Spares made by LA Sleeves . 40 or 60 thou oversize . The muffs are made identical top to bottom with ends parallel , same height .</p><p> The ID bores of the muffs are bored and honed to identical dimensions , dead straight , expanding mandrels used to hold them . The top is shaped to accept the liner flange . The flange recess in each head is refreshed and dimensioned to accept the liner up top . The faces of the head and muff top are to be flat and parallel . After lapping there will be a gap between the broad faces of 4 thou . This pulls down tight upon torquing the cylinder and heads down to 30 / 32 ft. Lbs ft torque . </p><p> The new sleeves are turned true and sized to be a 6 thou interferance fit within the prepped muffs , both surfaces now straight and parallel for max thermal flow , cool running . The liner id is bored and honed after insertion to the desired size . We like a skirt clearance of 4 thou with modern pistons as insurance against skirts picking up . The projecting portion at the bottom is turned down to a snug slide in fit in the case mouths with the left side case nuts backed off at center and forwards . </p><p> Insertion is made hot and afterward the assembly is left in the press until all is cool . </p><p> All this seems a bit much but is necessary for good performance and trouble free operation . Sid .</p></blockquote><p></p>
[QUOTE="Big Sid, post: 38302, member: 2781"] On liner fits . And source . Our experiance with marvelous machining by Bill Jean . We obtain oversize liners from Coventry Spares made by LA Sleeves . 40 or 60 thou oversize . The muffs are made identical top to bottom with ends parallel , same height . The ID bores of the muffs are bored and honed to identical dimensions , dead straight , expanding mandrels used to hold them . The top is shaped to accept the liner flange . The flange recess in each head is refreshed and dimensioned to accept the liner up top . The faces of the head and muff top are to be flat and parallel . After lapping there will be a gap between the broad faces of 4 thou . This pulls down tight upon torquing the cylinder and heads down to 30 / 32 ft. Lbs ft torque . The new sleeves are turned true and sized to be a 6 thou interferance fit within the prepped muffs , both surfaces now straight and parallel for max thermal flow , cool running . The liner id is bored and honed after insertion to the desired size . We like a skirt clearance of 4 thou with modern pistons as insurance against skirts picking up . The projecting portion at the bottom is turned down to a snug slide in fit in the case mouths with the left side case nuts backed off at center and forwards . Insertion is made hot and afterward the assembly is left in the press until all is cool . All this seems a bit much but is necessary for good performance and trouble free operation . Sid . [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Cylinder Liner fit to crankcases
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