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Tech. Advice: Series 'A' 500cc/1000cc Bikes
Series A Twin Breather
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<blockquote data-quote="Marcus Bowden" data-source="post: 99498" data-attributes="member: 3287"><p>Bill me handsome, Old Harry oil tank breather is a small bore pipe under the tank and is lead through the coils of the hire springs down to the rear chain area Have never actually measured what come out of it, I too use to suffer from oil around the filler cap so brazed on a large bore pipe lead down to a small pill bottle on top of the mag but never more than a couple of thimbles full. As the scavenge pump is twice that of the supply there must be a volume of C/case gases to the oil tank. My metering screws are removed from the rocker feeds as it is a small orifice (primus stove cleaner size) my two head breathers were lead to a catch tank but a little ugly so blanked them off and removed the coffin lid and fitted the coffin box and a ball non return valve (NRV) and the elephant trunk make a bit of a noise at the back of the bike so thinking of a read valve next time I find some thing suitable. If one has a large enough cavity box then the oil and vapor will separate then lead the drain line down to the crank case bottom through a hose with a 6" trap so the C/case pressure doesn't blow it back. Robert W told me this trick when I had an abundase of oil coming from the mag drive cover with the felt seal not good on front cam. Now has a lipped Gaco seal.</p><p>Take my coffin box off and have a look for your self Bill.</p><p> Will it be ready for the November riders rally ? </p><p>bananaman</p></blockquote><p></p>
[QUOTE="Marcus Bowden, post: 99498, member: 3287"] Bill me handsome, Old Harry oil tank breather is a small bore pipe under the tank and is lead through the coils of the hire springs down to the rear chain area Have never actually measured what come out of it, I too use to suffer from oil around the filler cap so brazed on a large bore pipe lead down to a small pill bottle on top of the mag but never more than a couple of thimbles full. As the scavenge pump is twice that of the supply there must be a volume of C/case gases to the oil tank. My metering screws are removed from the rocker feeds as it is a small orifice (primus stove cleaner size) my two head breathers were lead to a catch tank but a little ugly so blanked them off and removed the coffin lid and fitted the coffin box and a ball non return valve (NRV) and the elephant trunk make a bit of a noise at the back of the bike so thinking of a read valve next time I find some thing suitable. If one has a large enough cavity box then the oil and vapor will separate then lead the drain line down to the crank case bottom through a hose with a 6" trap so the C/case pressure doesn't blow it back. Robert W told me this trick when I had an abundase of oil coming from the mag drive cover with the felt seal not good on front cam. Now has a lipped Gaco seal. Take my coffin box off and have a look for your self Bill. Will it be ready for the November riders rally ? bananaman [/QUOTE]
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Tech. Advice: Series 'A' 500cc/1000cc Bikes
Series A Twin Breather
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