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General Chat (Vincent Related)
Alp Sungurtekin 666 Vincent Speedweek SCTA BNI August 8-14, 2020
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<blockquote data-quote="oexing" data-source="post: 125860" data-attributes="member: 1493"><p>The so-called superblends are standard roller bearings from mid-eighties, at least for FAG and SKF types. Zoom in on my photo and see the "polished down " ends of rollers of the bearings that go in my two B engines. This roller type is called a logarithmic shape for reducing high edge loads in certain conditions. Real barrel roller bearings were used in "sports" types of Earles fork BMWs R 50 S and R 69 S , 500 cc 35 hp @7500 rpm resp. 600 cc 42 Hp @7000 rpm. Touring types had ball bearings rear and front 35x72x17mm plus one small front ball bearing behind the crank mounted generator. So three bearings on the short flat twin crank - and I still don´t quite see what the barrel roller bearing does at the rear end just next to the TAPER mounted flywheel. They felt this was a brilliant idea . . . . Note the 35 mm main shafts on the sleek BMW cranks and their "sporty" conrods, knife cross section from mid fifties on these. The later /5 series were basically very close to car engine designs for cheap production ways - extremely different beasts they were so nothing that could possibly fascinate me with my tech mind on nice engineering. </p><p> Sorry , Bruce, for being so late in sending some more photos of real classy BMWs and parts to compare to more modern Berlin Motoren Werke. </p><p></p><p> Vic</p><p></p><p>[ATTACH=full]36765[/ATTACH]</p><p></p><p>[ATTACH=full]36766[/ATTACH]</p><p></p><p>[ATTACH=full]36767[/ATTACH]</p><p></p><p>[ATTACH=full]36768[/ATTACH]</p></blockquote><p></p>
[QUOTE="oexing, post: 125860, member: 1493"] The so-called superblends are standard roller bearings from mid-eighties, at least for FAG and SKF types. Zoom in on my photo and see the "polished down " ends of rollers of the bearings that go in my two B engines. This roller type is called a logarithmic shape for reducing high edge loads in certain conditions. Real barrel roller bearings were used in "sports" types of Earles fork BMWs R 50 S and R 69 S , 500 cc 35 hp @7500 rpm resp. 600 cc 42 Hp @7000 rpm. Touring types had ball bearings rear and front 35x72x17mm plus one small front ball bearing behind the crank mounted generator. So three bearings on the short flat twin crank - and I still don´t quite see what the barrel roller bearing does at the rear end just next to the TAPER mounted flywheel. They felt this was a brilliant idea . . . . Note the 35 mm main shafts on the sleek BMW cranks and their "sporty" conrods, knife cross section from mid fifties on these. The later /5 series were basically very close to car engine designs for cheap production ways - extremely different beasts they were so nothing that could possibly fascinate me with my tech mind on nice engineering. Sorry , Bruce, for being so late in sending some more photos of real classy BMWs and parts to compare to more modern Berlin Motoren Werke. Vic [ATTACH type="full"]36765[/ATTACH] [ATTACH type="full"]36766[/ATTACH] [ATTACH type="full"]36767[/ATTACH] [ATTACH type="full"]36768[/ATTACH] [/QUOTE]
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General Chat (Vincent Related)
Alp Sungurtekin 666 Vincent Speedweek SCTA BNI August 8-14, 2020
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