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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: 99871" data-attributes="member: 1493"><p>Sorry, I did not add that photo below, showing the window around the upper valve guide, done to ALL valve guide surrounds. My idea was mainly to get more oil thrown off the rocker onto the upper valve stem and twin springs that are not free from rubbing each other. Then the second target was providing a good access of crank case air venting into any hose that is connected to spring caps with their reed valve at the outer hose end. </p><p> Concerning condensation, I guess this mod cannot do much harm, possibly even be helpful, as the space above the springs is normally pretty isolated from the rest of the crank case air. It is hard to imagine there to be any (water?) condensation above the exhaust valve, at this very hot place ??? Maybe this is only a factor for bikes that get just short distance uses - bad for any engine and best to be avoided. </p><p> Hose length leading to a one way valve is not a real factor when you think about all that engine case air volume compared to a small hose . You do not need to fit big hoses for one way valves as there is only a very modest air flow when under way. </p><p>The big bonus with breather valves is the small vacuum in the crank case when there are a few places in the engine that contain doubtful seals - dynamo - magneto - main bearing scroll bush - valve lifter - any more ?? Valve types with sizeable weight internals are best avoided, pulsation is just too fast to handle that. So the reed type, simple to copy, has best characteristics and is tested since decades. </p><p></p><p> Vic</p><p>[ATTACH=full]23894[/ATTACH]</p></blockquote><p></p>
[QUOTE="oexing, post: 99871, member: 1493"] Sorry, I did not add that photo below, showing the window around the upper valve guide, done to ALL valve guide surrounds. My idea was mainly to get more oil thrown off the rocker onto the upper valve stem and twin springs that are not free from rubbing each other. Then the second target was providing a good access of crank case air venting into any hose that is connected to spring caps with their reed valve at the outer hose end. Concerning condensation, I guess this mod cannot do much harm, possibly even be helpful, as the space above the springs is normally pretty isolated from the rest of the crank case air. It is hard to imagine there to be any (water?) condensation above the exhaust valve, at this very hot place ??? Maybe this is only a factor for bikes that get just short distance uses - bad for any engine and best to be avoided. Hose length leading to a one way valve is not a real factor when you think about all that engine case air volume compared to a small hose . You do not need to fit big hoses for one way valves as there is only a very modest air flow when under way. The big bonus with breather valves is the small vacuum in the crank case when there are a few places in the engine that contain doubtful seals - dynamo - magneto - main bearing scroll bush - valve lifter - any more ?? Valve types with sizeable weight internals are best avoided, pulsation is just too fast to handle that. So the reed type, simple to copy, has best characteristics and is tested since decades. Vic [ATTACH=full]23894[/ATTACH] [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Elephant trunk breather
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