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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Breather help please
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<blockquote data-quote="timetraveller" data-source="post: 173490" data-attributes="member: 456"><p>lI think that there is some incorrect information here. The breather where the normal timed breather is does not look like a Vincent item and I would be surprised if the Spares Company supplied it. That very thin pipe coming off the side of the' banjo' connection is not normal but considering that the normal banjo bolt only has four small holes it is possible that the area inside the small pipe is adequate even if it does not look to be so. The 'elephants trunk' is no such thing. It appears to be just a small, hollow right angled connector. The elephants trunk device is much more elaborate. If one were to fit a one way valve to anything it should be to the 'elephants trunk'. The timed breather already has a device inside it to stop it sucking air in when the pistons are going up, hence the word <strong>timed</strong>. It is of course possible that this unfortunate mess has been created to overcome the fact that the timing of the breather is wrong or has slipped and there have been plenty of items on these pages as to how the timing of the original timed breather can be changed and improved. I would check the timing of the breather by removing the PCV valve and then blowing into it to see when the internal timed breather is actually open. You will need to take off some or all of the tappet inspection caps to determine the position of the valves and pistons.</p><p>A word of warning here is that none of us knows it all and it is possible that the previous owner of this bike was an expert in fluid flow dynamics and has created something here that works perfectly and is a vast improvement over what we have been doing over the last seventy odd years. If that is not the case and they have totally failed to understand what is supposed to be happening here I would suggest that you check the rest of the bike over very carefully,</p></blockquote><p></p>
[QUOTE="timetraveller, post: 173490, member: 456"] lI think that there is some incorrect information here. The breather where the normal timed breather is does not look like a Vincent item and I would be surprised if the Spares Company supplied it. That very thin pipe coming off the side of the' banjo' connection is not normal but considering that the normal banjo bolt only has four small holes it is possible that the area inside the small pipe is adequate even if it does not look to be so. The 'elephants trunk' is no such thing. It appears to be just a small, hollow right angled connector. The elephants trunk device is much more elaborate. If one were to fit a one way valve to anything it should be to the 'elephants trunk'. The timed breather already has a device inside it to stop it sucking air in when the pistons are going up, hence the word [B]timed[/B]. It is of course possible that this unfortunate mess has been created to overcome the fact that the timing of the breather is wrong or has slipped and there have been plenty of items on these pages as to how the timing of the original timed breather can be changed and improved. I would check the timing of the breather by removing the PCV valve and then blowing into it to see when the internal timed breather is actually open. You will need to take off some or all of the tappet inspection caps to determine the position of the valves and pistons. A word of warning here is that none of us knows it all and it is possible that the previous owner of this bike was an expert in fluid flow dynamics and has created something here that works perfectly and is a vast improvement over what we have been doing over the last seventy odd years. If that is not the case and they have totally failed to understand what is supposed to be happening here I would suggest that you check the rest of the bike over very carefully, [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Breather help please
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