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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Elephant trunk breather
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<blockquote data-quote="greg brillus" data-source="post: 99824" data-attributes="member: 597"><p>Bernd..........I think apart from widening the slot in the rotating breather pinion, it was more just making the outlet fittings larger in bore size. So instead of having the standard 1/4" passageway with restrictive banjo's, I used a straight nipple outlet with a larger bore size into a short length of 3/8" (10 mm) flexible hose, this then passed downward and into the lower front corner of the kickstart cover via the hole where the brass abutment for the kick start stop buffer/spring arrangement. The thing to remember about breathers is you are only really venting the excess crankcase pressure, that is, leakage past the rings. The timing chest is not really a good place to have a breather full stop, as there is quite a lot of oil flinging around when the engine is running. Most modern engines have breathers that are kept away from areas where quantities of oil can interrupt the outward flow of breather fumes. They generally draw these fumes into the intake manifold somewhere. Vincent engines and their breathing symptoms will always be a bind for owners.................<img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile :)" loading="lazy" data-shortname=":)" />.</p></blockquote><p></p>
[QUOTE="greg brillus, post: 99824, member: 597"] Bernd..........I think apart from widening the slot in the rotating breather pinion, it was more just making the outlet fittings larger in bore size. So instead of having the standard 1/4" passageway with restrictive banjo's, I used a straight nipple outlet with a larger bore size into a short length of 3/8" (10 mm) flexible hose, this then passed downward and into the lower front corner of the kickstart cover via the hole where the brass abutment for the kick start stop buffer/spring arrangement. The thing to remember about breathers is you are only really venting the excess crankcase pressure, that is, leakage past the rings. The timing chest is not really a good place to have a breather full stop, as there is quite a lot of oil flinging around when the engine is running. Most modern engines have breathers that are kept away from areas where quantities of oil can interrupt the outward flow of breather fumes. They generally draw these fumes into the intake manifold somewhere. Vincent engines and their breathing symptoms will always be a bind for owners.................:). [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Elephant trunk breather
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