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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
New ESA Design
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<blockquote data-quote="oexing" data-source="post: 89535" data-attributes="member: 1493"><p>I would not spend much time pondering about spring types, don´t think you´d get a better action within the old ESA. I will keep those small springs but the only real flaw of the original design is the shape of the cams which is not steep enough and leaves too much backlash for the engine to bash the endplate with lethal shockwaves sent into the chain. I say , throwing out the complete ESA would be easier on the chain than an ESA with the present behaviour. </p><p> When studying the photo of the Maugham version I wonder what the mating cam shape will look like ? Is it the same fancy tapering curves that we see in the photo? Next mystery to me is, how do they machine that shape ? Possibly with a little help from full CAD/CNC programming . Compared to that my mod was simple enough for my old brain to produce exactly fitting male and female partners from the first try on the alu test pair up to the welded sprocket, and that on an old manual mill, just having two DRO for mill and dividing head. Thinking about it, one could feed my little steps that I worked out and wheeled in manually, into a file of a CNC mill that is wired to a CNC dividing head. So then the machining operation would be smooth and quick in a continuous cut, no big headscratching of will it match the counteracting part ? The male cams are simple 12 mm dia. cylinders, programmed on the mill in no time, using a simple dividing head for three positions. Just the female is more tricky and laborious when you have to machine without CNC. </p><p> So basically the whole assembly may clearly stay as it is, just the shape of the cams needs radical redesign. Below is once again a photo of the BMW ESA type in the gearbox that was troublefree for decades from the fifties up to all modern two valve flat twins . I am very confident that my mod will do its job no problems. </p><p></p><p> Vic</p><p></p><p>[ATTACH=full]18433[/ATTACH]</p></blockquote><p></p>
[QUOTE="oexing, post: 89535, member: 1493"] I would not spend much time pondering about spring types, don´t think you´d get a better action within the old ESA. I will keep those small springs but the only real flaw of the original design is the shape of the cams which is not steep enough and leaves too much backlash for the engine to bash the endplate with lethal shockwaves sent into the chain. I say , throwing out the complete ESA would be easier on the chain than an ESA with the present behaviour. When studying the photo of the Maugham version I wonder what the mating cam shape will look like ? Is it the same fancy tapering curves that we see in the photo? Next mystery to me is, how do they machine that shape ? Possibly with a little help from full CAD/CNC programming . Compared to that my mod was simple enough for my old brain to produce exactly fitting male and female partners from the first try on the alu test pair up to the welded sprocket, and that on an old manual mill, just having two DRO for mill and dividing head. Thinking about it, one could feed my little steps that I worked out and wheeled in manually, into a file of a CNC mill that is wired to a CNC dividing head. So then the machining operation would be smooth and quick in a continuous cut, no big headscratching of will it match the counteracting part ? The male cams are simple 12 mm dia. cylinders, programmed on the mill in no time, using a simple dividing head for three positions. Just the female is more tricky and laborious when you have to machine without CNC. So basically the whole assembly may clearly stay as it is, just the shape of the cams needs radical redesign. Below is once again a photo of the BMW ESA type in the gearbox that was troublefree for decades from the fifties up to all modern two valve flat twins . I am very confident that my mod will do its job no problems. Vic [ATTACH=full]18433[/ATTACH] [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
New ESA Design
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