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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Dynamo Fitting
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<blockquote data-quote="oexing" data-source="post: 163934" data-attributes="member: 1493"><p>Certainly the primary is not meant to be an engine breather case. Standard was an effective oil scroll plus its close fit spacer on the crank mainshaft. So only minimum breathing from crankcase was going in the primary - provided the timed breather in timing side was correctly set. Any gap behind trhe dynamo sprocket was just for venting air in primary from temperature changes cold-warm, so minimum air to exit via this gap only. Condensation in this space is a factor when there is a lot of crankcase air finding its way through the oil scroll into the primary - plus lots of short trips when any moisture got no time for drying out at higher temperatures. I found this a while ago in a Horex single primary after having lots of short trips for setting up the carb using lambda sensor in ex pipe. </p><p> So get the engine breathing right, refrain from short trips and condensation in primary should not be found. The oil slinger is not too bad , no real seals were suitable as the through bore for the dynamo could not be a tight fit in order to set up tooth mesh of dyamo sprocket into triplex chain - or so I guess . You can bin the oil slinger for a v-ring as it does not care for close fits, you can move the dynamo about for setting mesh in triplex chain. Just the v-ring lip needs to sit on the slightly polished side face around the dynamo through bore , a bit of abrasive on a flat piece for smoothing the rough alu part is allright. Maybe the v-ring can be mounted on the PD 16 or PD 33 drive adaptors , cannot say, don´t have these on my engines. </p><p> My thinking for breathing the primary is to use the gearbox filler tube as the lid has a breather job anyway for the gearbox. I drilled into this filler tube in an upward angle so hopefully not much oil from primary will end in the gearbox. Maybe some shield around the drilling can prevent oil collecting and end in the gearbox. </p><p></p><p> Vic</p><p>[ATTACH=full]53801[/ATTACH]</p><p></p><p>[ATTACH=full]53802[/ATTACH]</p></blockquote><p></p>
[QUOTE="oexing, post: 163934, member: 1493"] Certainly the primary is not meant to be an engine breather case. Standard was an effective oil scroll plus its close fit spacer on the crank mainshaft. So only minimum breathing from crankcase was going in the primary - provided the timed breather in timing side was correctly set. Any gap behind trhe dynamo sprocket was just for venting air in primary from temperature changes cold-warm, so minimum air to exit via this gap only. Condensation in this space is a factor when there is a lot of crankcase air finding its way through the oil scroll into the primary - plus lots of short trips when any moisture got no time for drying out at higher temperatures. I found this a while ago in a Horex single primary after having lots of short trips for setting up the carb using lambda sensor in ex pipe. So get the engine breathing right, refrain from short trips and condensation in primary should not be found. The oil slinger is not too bad , no real seals were suitable as the through bore for the dynamo could not be a tight fit in order to set up tooth mesh of dyamo sprocket into triplex chain - or so I guess . You can bin the oil slinger for a v-ring as it does not care for close fits, you can move the dynamo about for setting mesh in triplex chain. Just the v-ring lip needs to sit on the slightly polished side face around the dynamo through bore , a bit of abrasive on a flat piece for smoothing the rough alu part is allright. Maybe the v-ring can be mounted on the PD 16 or PD 33 drive adaptors , cannot say, don´t have these on my engines. My thinking for breathing the primary is to use the gearbox filler tube as the lid has a breather job anyway for the gearbox. I drilled into this filler tube in an upward angle so hopefully not much oil from primary will end in the gearbox. Maybe some shield around the drilling can prevent oil collecting and end in the gearbox. Vic [ATTACH type="full"]53801[/ATTACH] [ATTACH type="full"]53802[/ATTACH] [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Dynamo Fitting
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