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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Checking the Cam timing on a twin
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<blockquote data-quote="oexing" data-source="post: 179704" data-attributes="member: 1493"><p>Tappet clearance with alu pushrods has to be tested in use. I would not think it will be much as length is not a lot compared to Horex postwar or BMW /5 , /6 ,/7 types alu pushrods at twice the size. See the BMWs are all alu engines too and they live with around 0.15 to 0.25mm play cold. So in case I find that clearance in hot state goes to zero I can do some controlled clearance by first setting for nil play and then undo one flat on the adjuster - or whatever I feel it needs. Pushrods may grow less than the cylinder and head as they sit in shrouds in plain air but sure I am unable to tell what valves do in this business to clearances. What do you think about thin-walled stainless pushrods like in my link above ? I like the better heat growth as the steel standards cannot cope with growing rest of alu engine ? </p><p> In the postwar Horex Regina 460 special I made an alu cylinder and certainly kept the standard alu pushrods. With a hot engine I see a bit too much clearance really, so I´d rather have more heat growth but don´t see any chance when having alu already . </p><p> I love roller followers but typically they add some weight in the valve train. So curved followers would be better for very high revs. But then a Vincent is not the high revving bike anyway, limits are found elsewhere. The prewar Horexes and the 1935 Guzzi got roller followers, crowded needle bearings in there my modification as you will guess. Plain bushes will not last long and never did in the past. Manufacturers never decided on crowded needle bearings then, too expensive possibly their view on this. </p><p></p><p> Vic</p><p></p><p>top is alu Horex postwar 400, next is BMW /5 stainless (heavy) , then Vincent steel and bottom my alu with ball ends pressed in. </p><p>[ATTACH=full]62300[/ATTACH]</p><p></p><p>prewar Horex roller followers modded for needles:</p><p>[ATTACH=full]62301[/ATTACH]</p><p></p><p>[ATTACH=full]62302[/ATTACH]</p><p></p><p>Guzzi prewar standard left side:</p><p>[ATTACH=full]62303[/ATTACH]</p><p></p><p>Horex 460 special alu cylinder:</p><p>[ATTACH=full]62304[/ATTACH]</p></blockquote><p></p>
[QUOTE="oexing, post: 179704, member: 1493"] Tappet clearance with alu pushrods has to be tested in use. I would not think it will be much as length is not a lot compared to Horex postwar or BMW /5 , /6 ,/7 types alu pushrods at twice the size. See the BMWs are all alu engines too and they live with around 0.15 to 0.25mm play cold. So in case I find that clearance in hot state goes to zero I can do some controlled clearance by first setting for nil play and then undo one flat on the adjuster - or whatever I feel it needs. Pushrods may grow less than the cylinder and head as they sit in shrouds in plain air but sure I am unable to tell what valves do in this business to clearances. What do you think about thin-walled stainless pushrods like in my link above ? I like the better heat growth as the steel standards cannot cope with growing rest of alu engine ? In the postwar Horex Regina 460 special I made an alu cylinder and certainly kept the standard alu pushrods. With a hot engine I see a bit too much clearance really, so I´d rather have more heat growth but don´t see any chance when having alu already . I love roller followers but typically they add some weight in the valve train. So curved followers would be better for very high revs. But then a Vincent is not the high revving bike anyway, limits are found elsewhere. The prewar Horexes and the 1935 Guzzi got roller followers, crowded needle bearings in there my modification as you will guess. Plain bushes will not last long and never did in the past. Manufacturers never decided on crowded needle bearings then, too expensive possibly their view on this. Vic top is alu Horex postwar 400, next is BMW /5 stainless (heavy) , then Vincent steel and bottom my alu with ball ends pressed in. [ATTACH type="full"]62300[/ATTACH] prewar Horex roller followers modded for needles: [ATTACH type="full"]62301[/ATTACH] [ATTACH type="full"]62302[/ATTACH] Guzzi prewar standard left side: [ATTACH type="full"]62303[/ATTACH] Horex 460 special alu cylinder: [ATTACH type="full"]62304[/ATTACH] [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Checking the Cam timing on a twin
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