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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Additional or alternative engine breather
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<blockquote data-quote="john998" data-source="post: 13213" data-attributes="member: 289"><p><strong>Breather</strong></p><p></p><p>Timetraveller makes a good point, you can have a timed breather or an open one, both together can cause the open one to pull in dust and grit.</p><p>Aeons ago I fitted an open breather on the primary case, the result was a gritty sludge in the bottom of the case.</p><p>My set up now is a form of elephants trunk made up in stainless steel that Ivan Caffery used to supply. It has a nylon ball non return valve that is a little noisy but it cut the oil consumption by 50%.</p><p>Not sure why some folk call the valve a PCV, I think they are more correctly called non return valves.</p><p>As far as negative crankcase pressure causing oil return problems go, I like Bill Thomas have not had any trouble. The potential negative pressure if you are very lucky is only a few millibars, and is unlikely to be achieved on most engines. John.</p></blockquote><p></p>
[QUOTE="john998, post: 13213, member: 289"] [b]Breather[/b] Timetraveller makes a good point, you can have a timed breather or an open one, both together can cause the open one to pull in dust and grit. Aeons ago I fitted an open breather on the primary case, the result was a gritty sludge in the bottom of the case. My set up now is a form of elephants trunk made up in stainless steel that Ivan Caffery used to supply. It has a nylon ball non return valve that is a little noisy but it cut the oil consumption by 50%. Not sure why some folk call the valve a PCV, I think they are more correctly called non return valves. As far as negative crankcase pressure causing oil return problems go, I like Bill Thomas have not had any trouble. The potential negative pressure if you are very lucky is only a few millibars, and is unlikely to be achieved on most engines. John. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Additional or alternative engine breather
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