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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
more on breathers
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<blockquote data-quote="macvette" data-source="post: 51062" data-attributes="member: 262"><p>Open Series D, engine rebuilt four years ago an now well run in. Standard D breather with outlet routed to an aluminium pedal bike drink bottle mounted on near side of the battery carrier. The outlet from the front exhaust cap is piped to a dip tube which ends just above the the bottom of the bottle and there is a short vent pipe from the top of the bottle. I put a couple of inches of oil in the bottle to create a liquid seal so it's easier for crankcase pressure to get out but needs about 4 ins of vacuum before outside air can get into the crankcase. The set up looks standard except for the bottle which fortunately came finished black so it doesn't stand out. The engine has inlet valve seals and when it's running you can feel a slight pulse of air from the vent tube on the bottle but no oil comes out. The oil level in the bottle barely changes in a years riding and the engine doesn't drip ( there is the occasional smear of oil around the rocker oil pipes). This is probably due to a very careful rebuild as well as the breather arrangement .</p></blockquote><p></p>
[QUOTE="macvette, post: 51062, member: 262"] Open Series D, engine rebuilt four years ago an now well run in. Standard D breather with outlet routed to an aluminium pedal bike drink bottle mounted on near side of the battery carrier. The outlet from the front exhaust cap is piped to a dip tube which ends just above the the bottom of the bottle and there is a short vent pipe from the top of the bottle. I put a couple of inches of oil in the bottle to create a liquid seal so it's easier for crankcase pressure to get out but needs about 4 ins of vacuum before outside air can get into the crankcase. The set up looks standard except for the bottle which fortunately came finished black so it doesn't stand out. The engine has inlet valve seals and when it's running you can feel a slight pulse of air from the vent tube on the bottle but no oil comes out. The oil level in the bottle barely changes in a years riding and the engine doesn't drip ( there is the occasional smear of oil around the rocker oil pipes). This is probably due to a very careful rebuild as well as the breather arrangement . [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
more on breathers
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