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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Breather help please
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<blockquote data-quote="oexing" data-source="post: 173606" data-attributes="member: 1493"><p>While Vincent´s elephant is the nicest elephant I have seen I would not want one on my bikes. It is a bit bulkier than the standard cover and there is one hose pointing down. So no way can any minimal oil return or drain into the engine. Where does this hose end - in the air below the engine ?? So that bit of remaining oil will go down the road - just like with the standard timed breather setup !!</p><p> With sick engine I mean any leaking seals (dynamo) or worn piston rings so there will be quite some more air to go out any sort of breather system that is not just blow-by from rings. So with a healthy engine you have just some piston ring blow-by air which is minimal and will not lead oil drops up the hose to the reed valve stuck up the hose end to exit into free air.</p><p> So yes, Kerry, keep the small elephant and have the valve repositioned at end of hose , could be under dual seat at the back, no oil expected from there at all. Just feel with your hand behind the air exit for judging the small amount of air we are dealing with at all. A small hose will do nicely .</p><p> As said, with the timed breather Vincenteers are used to have well oiled rear tyres as the hose runs along the bike very low to rear axle plus one or two pipes that are meant to deflect oily air away from the tyre - and mark their territory at each meeting parking space . . . . So no to timed breather as oil cannot return into the engine once in the hose .</p><p> I´d prefer to have the breather hose alternatively connected to a valve spring cap high in the engine and far away from heavy oil mist like in the timing chest - where you really want a lot of oil mist for lubricating cams and followers ! Again, stick the reed valve into the end of breather hose a bit higher level than the valve cap, so a chance for drain-back to engine .</p><p> For easing air exit from valve cap it is never wrong to widen the gap made for the rocker in the head like in my photo - for all valves ! . Another plus is more oil mist for upper valve guide AND for valve springs that like lube as they are designed for bodily contact each other - flutter fighting spring resonance effects !!</p><p> </p><p> Vic</p><p>[ATTACH=full]59816[/ATTACH]</p></blockquote><p></p>
[QUOTE="oexing, post: 173606, member: 1493"] While Vincent´s elephant is the nicest elephant I have seen I would not want one on my bikes. It is a bit bulkier than the standard cover and there is one hose pointing down. So no way can any minimal oil return or drain into the engine. Where does this hose end - in the air below the engine ?? So that bit of remaining oil will go down the road - just like with the standard timed breather setup !! With sick engine I mean any leaking seals (dynamo) or worn piston rings so there will be quite some more air to go out any sort of breather system that is not just blow-by from rings. So with a healthy engine you have just some piston ring blow-by air which is minimal and will not lead oil drops up the hose to the reed valve stuck up the hose end to exit into free air. So yes, Kerry, keep the small elephant and have the valve repositioned at end of hose , could be under dual seat at the back, no oil expected from there at all. Just feel with your hand behind the air exit for judging the small amount of air we are dealing with at all. A small hose will do nicely . As said, with the timed breather Vincenteers are used to have well oiled rear tyres as the hose runs along the bike very low to rear axle plus one or two pipes that are meant to deflect oily air away from the tyre - and mark their territory at each meeting parking space . . . . So no to timed breather as oil cannot return into the engine once in the hose . I´d prefer to have the breather hose alternatively connected to a valve spring cap high in the engine and far away from heavy oil mist like in the timing chest - where you really want a lot of oil mist for lubricating cams and followers ! Again, stick the reed valve into the end of breather hose a bit higher level than the valve cap, so a chance for drain-back to engine . For easing air exit from valve cap it is never wrong to widen the gap made for the rocker in the head like in my photo - for all valves ! . Another plus is more oil mist for upper valve guide AND for valve springs that like lube as they are designed for bodily contact each other - flutter fighting spring resonance effects !! Vic [ATTACH type="full" alt="P1060335.JPG"]59816[/ATTACH] [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Breather help please
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