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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Elephant trunk breather
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<blockquote data-quote="oexing" data-source="post: 99848" data-attributes="member: 1493"><p>Well, I say the elephant-trunk breather is a particularly poor design, ugly too, as it is placed in that open space that everybody looks at. Secondly it is venting a very oil loaded space so you have to care for any oil mist that may find it´s way out of the huge hose that must lead somewhere. I fabricated some breathers of the reed type like in the photos that you stick up the end of some small hose you could place out of sight. As it is a one-way type you will not observe much oil loss because there is only a small amount of air that passes, from piston ring blow-by mainly, provided trhe engine did not suffer a holed piston but then the breather is your smallest problem. </p><p> When hiding the hose somewhere - under the tank or seat - it is a good idea to have the reed valve at the end up high, so any drops of oil can drain down the hose back into the engine. The pictured valve is made from 12mm stainless, drilled 6mm , 3mm screw for reed and milled flat for the .10mm / 4-5 thou feeler gage blade to seal at the narrow faces around the Dremeled chamfered opening. The reason for the Dremel chamfer operation is to reduce the contact faces in case some oil mist gets there as oil makes the reed blade to stick a lot and much more pressure is required to force the reed blade to open. As I said, this small valve is all you need, there is normally not much air to be vented from a one way valve on a healthy engine. When thinking about a good place to fit a hose I´d go for the rear cylinder inlet valve spring cover - out of sight and not much oil flying around there. To help the crank case air to vent into that hose I did open up a window around the upper valve guide, see photo, all guide windows done on both heads of course, in order to care for better access of oil to the twin valve springs. These spaces seem to have been ignored lubrication-wise. </p><p></p><p> Vic</p><p>[ATTACH=full]23829[/ATTACH]</p><p></p><p>[ATTACH=full]23830[/ATTACH]</p><p></p><p>[ATTACH=full]23831[/ATTACH]</p></blockquote><p></p>
[QUOTE="oexing, post: 99848, member: 1493"] Well, I say the elephant-trunk breather is a particularly poor design, ugly too, as it is placed in that open space that everybody looks at. Secondly it is venting a very oil loaded space so you have to care for any oil mist that may find it´s way out of the huge hose that must lead somewhere. I fabricated some breathers of the reed type like in the photos that you stick up the end of some small hose you could place out of sight. As it is a one-way type you will not observe much oil loss because there is only a small amount of air that passes, from piston ring blow-by mainly, provided trhe engine did not suffer a holed piston but then the breather is your smallest problem. When hiding the hose somewhere - under the tank or seat - it is a good idea to have the reed valve at the end up high, so any drops of oil can drain down the hose back into the engine. The pictured valve is made from 12mm stainless, drilled 6mm , 3mm screw for reed and milled flat for the .10mm / 4-5 thou feeler gage blade to seal at the narrow faces around the Dremeled chamfered opening. The reason for the Dremel chamfer operation is to reduce the contact faces in case some oil mist gets there as oil makes the reed blade to stick a lot and much more pressure is required to force the reed blade to open. As I said, this small valve is all you need, there is normally not much air to be vented from a one way valve on a healthy engine. When thinking about a good place to fit a hose I´d go for the rear cylinder inlet valve spring cover - out of sight and not much oil flying around there. To help the crank case air to vent into that hose I did open up a window around the upper valve guide, see photo, all guide windows done on both heads of course, in order to care for better access of oil to the twin valve springs. These spaces seem to have been ignored lubrication-wise. Vic [ATTACH=full]23829[/ATTACH] [ATTACH=full]23830[/ATTACH] [ATTACH=full]23831[/ATTACH] [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Elephant trunk breather
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