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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Oil loss through breather pipe
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<blockquote data-quote="timetraveller" data-source="post: 16557" data-attributes="member: 456"><p><span style="font-family: 'Times New Roman'"><span style="font-size: 12px">Hi John, your point is well made and I am sure that you are correct. However, the extra oil is only that which can get through the four small holes in the rocker feed bolts. Compare their combined cross sectional area with that of return pipe or even that of the four holes in a banjo bolt, noting the low pressure in the system and it is difficult to see how this amount of oil is going to overload the return side of the pump. What ever we think the theory is, none of my bikes with twin start pumps and no metering wires build up oil in the crank case and oil being pumped out of the breather at tick over <strong>in large quantities </strong>is not normal. A small amount almost certainly is nothing to worry about. Tony can easily tell which pump he has by looking inside the filler cap of the oil tank and seeing the returning oil when the bike is ticking over. If it is a blob every second or so then it is a single start pump, if it is more than that then it is probably a twin start. Additionally, if it is a twin start then almost certainly someone will have fitted a small deflector under the screw on top of the boss that the returning oil emerges from as at higher revs there is enough flow to cause splashing and this will get past the seal in the oil filler cap and cause oil to eventually cover the top of the engine. In the mean time I agree that Tony should continue to ride and enjoy the bike. Pity to waste all that riding in sunshine time.</span></span></p></blockquote><p></p>
[QUOTE="timetraveller, post: 16557, member: 456"] [FONT=Times New Roman][SIZE=3]Hi John, your point is well made and I am sure that you are correct. However, the extra oil is only that which can get through the four small holes in the rocker feed bolts. Compare their combined cross sectional area with that of return pipe or even that of the four holes in a banjo bolt, noting the low pressure in the system and it is difficult to see how this amount of oil is going to overload the return side of the pump. What ever we think the theory is, none of my bikes with twin start pumps and no metering wires build up oil in the crank case and oil being pumped out of the breather at tick over [B]in large quantities [/B]is not normal. A small amount almost certainly is nothing to worry about. Tony can easily tell which pump he has by looking inside the filler cap of the oil tank and seeing the returning oil when the bike is ticking over. If it is a blob every second or so then it is a single start pump, if it is more than that then it is probably a twin start. Additionally, if it is a twin start then almost certainly someone will have fitted a small deflector under the screw on top of the boss that the returning oil emerges from as at higher revs there is enough flow to cause splashing and this will get past the seal in the oil filler cap and cause oil to eventually cover the top of the engine. In the mean time I agree that Tony should continue to ride and enjoy the bike. Pity to waste all that riding in sunshine time.[/SIZE][/FONT] [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Oil loss through breather pipe
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