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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
poor quality repop silencers
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<blockquote data-quote="macvette" data-source="post: 109499" data-attributes="member: 262"><p>In oil,gas and petrochemical industry, the guys who erect piping are pipefitters. On piping which connects to machinery ( turbines, compessors</p><p>and pumps etc), the LAST flange to be set and welded is the one connected to the machine(s) in question. Now these are large diameter, subject to wide temperature variations and have sophisticated pipe supprt systems to avoid stress on the machine. Nevertheless, the last flange is precisely aligned across it's diameter in all directions.</p><p>Given that the twin front pipe is fabricated solid and using the priciples above, the front head joint and lower bolt determine the orientation of the rear head pipe and its flange which means its flange will need adjusting in three planes not necessarily at right angle to the pipe axis, I start with the front pipe and adjust it so that it can be fitted solidly with the nut just more than finger tight with the lower bolt, silencer and its support in the final position. This means adjusting the flange first followed by the lower bolt either by enlarging its hole and or adding spacers and maybe bending the support tab to get the kickstart and gearbox clearance correct.</p><p>The rear pipe is tricky and may need several trial fits to get the flange to seat properly. I find this is easier if the front pipe is expanded where it is slotted to allow easy in and out adjustment of the the rear pipe. It is returned to standard on final assembly.</p><p>Norman is right about the accuracy of CNC pipe benders in that the pipes would be consistent, however, this would not address the inherent inconsistency in one Vinnie to another so as Bill says it comes down to "fitting"</p></blockquote><p></p>
[QUOTE="macvette, post: 109499, member: 262"] In oil,gas and petrochemical industry, the guys who erect piping are pipefitters. On piping which connects to machinery ( turbines, compessors and pumps etc), the LAST flange to be set and welded is the one connected to the machine(s) in question. Now these are large diameter, subject to wide temperature variations and have sophisticated pipe supprt systems to avoid stress on the machine. Nevertheless, the last flange is precisely aligned across it's diameter in all directions. Given that the twin front pipe is fabricated solid and using the priciples above, the front head joint and lower bolt determine the orientation of the rear head pipe and its flange which means its flange will need adjusting in three planes not necessarily at right angle to the pipe axis, I start with the front pipe and adjust it so that it can be fitted solidly with the nut just more than finger tight with the lower bolt, silencer and its support in the final position. This means adjusting the flange first followed by the lower bolt either by enlarging its hole and or adding spacers and maybe bending the support tab to get the kickstart and gearbox clearance correct. The rear pipe is tricky and may need several trial fits to get the flange to seat properly. I find this is easier if the front pipe is expanded where it is slotted to allow easy in and out adjustment of the the rear pipe. It is returned to standard on final assembly. Norman is right about the accuracy of CNC pipe benders in that the pipes would be consistent, however, this would not address the inherent inconsistency in one Vinnie to another so as Bill says it comes down to "fitting" [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
poor quality repop silencers
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