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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
ET48 Mag/ATD Pinion
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<blockquote data-quote="oexing" data-source="post: 148403" data-attributes="member: 1493"><p>Actually, when calculating heat growth for spindles distances it is not quite so bad as I was expecting. With engine temperature at 80 degrees C in operation you´d see a plus of 0.20 -0.30 mm for crank case in alu. That means the steel steady will do half of this , 0.10 - 0.15mm . My guess then, the fit of holes in the steady plate for spindle ends might be not quite so perfect in the real world. So that side load from heat growth will be concealed somewhere on the way somehow. In effect this can be seen as a more academic discussion when associated with vintage bikes - and I am not one of them , I mean academics . </p><p> Sure, the job of the steady plate was initially to support the free ends of all spindles. But how can you achieve this with an old engine and replaced spindles ? I had the timing side on the mill to measure up positions as they actually were for fabricating new alu plates. But how do you deal with this at home - no simple thing when shifting the large idler around for good mesh with camgears ? Another place for improvisations to put it nicely . </p><p></p><p> Vic</p></blockquote><p></p>
[QUOTE="oexing, post: 148403, member: 1493"] Actually, when calculating heat growth for spindles distances it is not quite so bad as I was expecting. With engine temperature at 80 degrees C in operation you´d see a plus of 0.20 -0.30 mm for crank case in alu. That means the steel steady will do half of this , 0.10 - 0.15mm . My guess then, the fit of holes in the steady plate for spindle ends might be not quite so perfect in the real world. So that side load from heat growth will be concealed somewhere on the way somehow. In effect this can be seen as a more academic discussion when associated with vintage bikes - and I am not one of them , I mean academics . Sure, the job of the steady plate was initially to support the free ends of all spindles. But how can you achieve this with an old engine and replaced spindles ? I had the timing side on the mill to measure up positions as they actually were for fabricating new alu plates. But how do you deal with this at home - no simple thing when shifting the large idler around for good mesh with camgears ? Another place for improvisations to put it nicely . Vic [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
ET48 Mag/ATD Pinion
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