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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Quieting ramps / Andrews Mk 2
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<blockquote data-quote="oexing" data-source="post: 178769" data-attributes="member: 1493"><p>Vincent, you are quite right on the properties of alu: The E-modul is one third of steel so when you need same stiffness you have to design for 3 times thicker components. So as specific weight is one third as well you end up with a component with same weight like the initial steel component - so no weight benefit by having alu. </p><p> When elastic deformation is not a problem you can have parts at much lower weight with alu. </p><p> The alu tubing used by BMW or Horex got 2mm wall thickness so these are quite acceptable for that job. The R 100 RS got looong pushrods, twice as long than Vincent types. Yet they do 7000 rpm plus for 70 hp, some flex is expected certainly but they hold up allright. This matter is no concern with the very short Vincent tubes I did , extremely unlikely to buckle them. I got some titanium tubes , did several components on my HRDs in titanium but would not accept this for pushrods as heat growth is miserably low - just not what I had in mind. </p><p> I found very thin walled stainless tubing, that would be better than high tensile steel as heat growth is better than carbon steel but a lot less than alu. Sofar no better ideas here about any other material for pushrods. </p><p> Just for adding to the matter, the sports BMW R 69 S had extremely lightweight thinwalled CrMo steel pushrods with brazed on ball ends to go with cast iron cylinders, alu heads, plus rockers mounted on top of long steel pillars reaching down near the head gasket level so the actual aluminium material that may effect heat growth and fucking up valve clearance by a hot engine is only 15-20 mm remaining. So by that trick they got away from noisy engines in hot condition even with no alu pushrods in them. </p><p> And certainly crowded needle bearings in rockers as standard on sports types, just I had smaller needles, were 3mm, now 1.5 or 2mm after overhauling them at maybe 100 000 miles - ahhm, converted from kilometers of course, never got mileages out of them . . .</p><p> Since 1980 I got alucylinders too , 730 cc then, but kept the steel pushrods. So all I can do have zero clearance in cold engine - like Vincents - and accept some minimal noise from extra clearance when the thing heats up. But then the Schleicher camshafts are according to modern knowledge well designed with quieting ramps certainly. </p><p></p><p> Vic</p><p></p><p>[ATTACH=full]61920[/ATTACH]</p><p></p><p>[ATTACH=full]61921[/ATTACH]</p></blockquote><p></p>
[QUOTE="oexing, post: 178769, member: 1493"] Vincent, you are quite right on the properties of alu: The E-modul is one third of steel so when you need same stiffness you have to design for 3 times thicker components. So as specific weight is one third as well you end up with a component with same weight like the initial steel component - so no weight benefit by having alu. When elastic deformation is not a problem you can have parts at much lower weight with alu. The alu tubing used by BMW or Horex got 2mm wall thickness so these are quite acceptable for that job. The R 100 RS got looong pushrods, twice as long than Vincent types. Yet they do 7000 rpm plus for 70 hp, some flex is expected certainly but they hold up allright. This matter is no concern with the very short Vincent tubes I did , extremely unlikely to buckle them. I got some titanium tubes , did several components on my HRDs in titanium but would not accept this for pushrods as heat growth is miserably low - just not what I had in mind. I found very thin walled stainless tubing, that would be better than high tensile steel as heat growth is better than carbon steel but a lot less than alu. Sofar no better ideas here about any other material for pushrods. Just for adding to the matter, the sports BMW R 69 S had extremely lightweight thinwalled CrMo steel pushrods with brazed on ball ends to go with cast iron cylinders, alu heads, plus rockers mounted on top of long steel pillars reaching down near the head gasket level so the actual aluminium material that may effect heat growth and fucking up valve clearance by a hot engine is only 15-20 mm remaining. So by that trick they got away from noisy engines in hot condition even with no alu pushrods in them. And certainly crowded needle bearings in rockers as standard on sports types, just I had smaller needles, were 3mm, now 1.5 or 2mm after overhauling them at maybe 100 000 miles - ahhm, converted from kilometers of course, never got mileages out of them . . . Since 1980 I got alucylinders too , 730 cc then, but kept the steel pushrods. So all I can do have zero clearance in cold engine - like Vincents - and accept some minimal noise from extra clearance when the thing heats up. But then the Schleicher camshafts are according to modern knowledge well designed with quieting ramps certainly. Vic [ATTACH type="full"]61920[/ATTACH] [ATTACH type="full"]61921[/ATTACH] [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Quieting ramps / Andrews Mk 2
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