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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Oil loss through breather pipe
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<blockquote data-quote="ernie" data-source="post: 16659" data-attributes="member: 63"><p>Oh allright then, Stuart, lovely boy, quick resume.</p><p></p><p>Rapide: Long ago I fitted a D breather - and it was fine for about 40k miles but then the blow-by was overcoming it, thin pipe debouched at the rear axle and dripped so much that following riders would be covered in oil. Crank-case pressure at high speed threatened to push out the push-rod seals. Non-return valve in the 3/8" pipe made no difference. Oil consumption about 300mpp but no smoke from the exhaust, standard valve quides.</p><p></p><p>Peter Volkers took pity on me and gave me a breather the fits over the magneto drive hole. Beautifully made out of turned aluminium, slim, with a gauze inside. It rises nicely to nestle under the tank, curves down to the centre stand and not a drop of oil comes out tho' you can feel the pulses of air. 1/2' pipe so not too obtrusive. See picture. Clevtrev and Rex rebuilt the engine 2 years and 4k miles ago, new +40 pistons but did not do anything to the heads apart from checking. Oil consumption 700mpp.</p><p></p><p>Shadow: This is original with about 12k miles when I got it. It had not been run for 40 years so a toss up as to whether to strip it or just run it and see what happens. Chose the latter. It was very smokey when it started and dripped from the standard breather at tickover. It also oiled pugs so that the front one had to be changed every 200 miles. I fitted an elephant's trunk breather from Kemp's. This is a cast item and bulkier than the Volkers one, has a gauze but wants a 5/8" pipe which I did not like. So I sleeved it down to take a 1/2" pipe running the same route as the Rapide, painted it black. I installed a metering wire in the front inlet rocker feed and this helped the oiling plug problem a lot. I might try doing the other rocker feeds as well but I do not think that will make much difference. The smoke in the exhaust gradually diminished so now there is none visible but consumption is 300 mpp. See second picture.</p><p></p><p>I think that is enough for now.</p><p></p><p>Yes, Bruce, Malta was hot then. No food and lots of bombs. </p><p></p><p>Best regards</p><p></p><p>Ernie</p></blockquote><p></p>
[QUOTE="ernie, post: 16659, member: 63"] Oh allright then, Stuart, lovely boy, quick resume. Rapide: Long ago I fitted a D breather - and it was fine for about 40k miles but then the blow-by was overcoming it, thin pipe debouched at the rear axle and dripped so much that following riders would be covered in oil. Crank-case pressure at high speed threatened to push out the push-rod seals. Non-return valve in the 3/8" pipe made no difference. Oil consumption about 300mpp but no smoke from the exhaust, standard valve quides. Peter Volkers took pity on me and gave me a breather the fits over the magneto drive hole. Beautifully made out of turned aluminium, slim, with a gauze inside. It rises nicely to nestle under the tank, curves down to the centre stand and not a drop of oil comes out tho' you can feel the pulses of air. 1/2' pipe so not too obtrusive. See picture. Clevtrev and Rex rebuilt the engine 2 years and 4k miles ago, new +40 pistons but did not do anything to the heads apart from checking. Oil consumption 700mpp. Shadow: This is original with about 12k miles when I got it. It had not been run for 40 years so a toss up as to whether to strip it or just run it and see what happens. Chose the latter. It was very smokey when it started and dripped from the standard breather at tickover. It also oiled pugs so that the front one had to be changed every 200 miles. I fitted an elephant's trunk breather from Kemp's. This is a cast item and bulkier than the Volkers one, has a gauze but wants a 5/8" pipe which I did not like. So I sleeved it down to take a 1/2" pipe running the same route as the Rapide, painted it black. I installed a metering wire in the front inlet rocker feed and this helped the oiling plug problem a lot. I might try doing the other rocker feeds as well but I do not think that will make much difference. The smoke in the exhaust gradually diminished so now there is none visible but consumption is 300 mpp. See second picture. I think that is enough for now. Yes, Bruce, Malta was hot then. No food and lots of bombs. Best regards Ernie [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Oil loss through breather pipe
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