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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Oil loss through breather pipe
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<blockquote data-quote="Tom Gaynor" data-source="post: 16521" data-attributes="member: 4034"><p>Sid Biberman told me the breather was better fitted to the rocker inspection covers. I admit I thought this was a refinement too far, but eventually tried it, moving the (D type + PCV) breather from the front exhaust valve cover to the front inlet rocker cover. Sid was right. It did dump less oil. It did however still dump far too much. Simon Linford advised a breather catch bottle so I could find out how much, which is good advice even if later, problem solved, one could dispense with it. But it did lead to the jiggle wire / two start pump discovery, so everything turned out well in the end.</p><p>What I like about the PCV is that it is closes the moment it has a vacuum applied. I always imagine oil forced out under crankcase pressure, about to escape to where I'll have to clean it up, being remorselessly sucked back into the engine. This is almost certainly the result of an over-active imagination, but, what the hell, simple things please simple minds.</p><p>The best of all breathers is the one on G50 Matchless's. I have one on my Manx. It consists of a flap valve (PCV) in the end of the drive-side mainshaft. It opens under pressure, closes under vacuum. It breathes to atmosphere. The genius is that centrifugal force keeps the crank <strong>axis</strong> clear of oil, so nothing comes out but oil-free air. There isn't so much as an oil-stain on the fairing immediately adjacent. Now THAT's clever.</p></blockquote><p></p>
[QUOTE="Tom Gaynor, post: 16521, member: 4034"] Sid Biberman told me the breather was better fitted to the rocker inspection covers. I admit I thought this was a refinement too far, but eventually tried it, moving the (D type + PCV) breather from the front exhaust valve cover to the front inlet rocker cover. Sid was right. It did dump less oil. It did however still dump far too much. Simon Linford advised a breather catch bottle so I could find out how much, which is good advice even if later, problem solved, one could dispense with it. But it did lead to the jiggle wire / two start pump discovery, so everything turned out well in the end. What I like about the PCV is that it is closes the moment it has a vacuum applied. I always imagine oil forced out under crankcase pressure, about to escape to where I'll have to clean it up, being remorselessly sucked back into the engine. This is almost certainly the result of an over-active imagination, but, what the hell, simple things please simple minds. The best of all breathers is the one on G50 Matchless's. I have one on my Manx. It consists of a flap valve (PCV) in the end of the drive-side mainshaft. It opens under pressure, closes under vacuum. It breathes to atmosphere. The genius is that centrifugal force keeps the crank [B]axis[/B] clear of oil, so nothing comes out but oil-free air. There isn't so much as an oil-stain on the fairing immediately adjacent. Now THAT's clever. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Oil loss through breather pipe
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