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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Cylinder Oil Feed on Comet
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<blockquote data-quote="Matty" data-source="post: 58918" data-attributes="member: 1339"><p>Thanks - having had a look on the site I find that I had asked this question some years ago and concluded that blocking the feed to the cam follower spindle which feeds the cylinder oiler had little effect on oil consumption. It's me age you know!!</p><p>I shall therefore remove the restriction and restore the system to its original state when I put the rebored cylinder and new piston together next week.</p><p> </p><p>However I still do not quite understand how the oil is intended to get positivly onto the cylinder wall, because the flow seems to be from the feed in the crankcase mouth, into the groove in the outside of the cylinder, after which it will run down the groove and mostly go into the crankcase and then with a bit of luck some of it may go through the small hole down onto the cylinder wall.</p><p> </p><p>This state of affairs will happen for my Comet because the scraper ring at bottom dead centre is only just above the lubricating hole in the cylinder and the groove with the hole drilled at a downward angle at the end, finishes below the level of the crankcase mouth - so most of the oil will go straight into the crankcase.</p><p> </p><p>Any comments please or is my Comet very non-standard - which I doubt because it had only been used for two years when I bought it in 1956 !!</p></blockquote><p></p>
[QUOTE="Matty, post: 58918, member: 1339"] Thanks - having had a look on the site I find that I had asked this question some years ago and concluded that blocking the feed to the cam follower spindle which feeds the cylinder oiler had little effect on oil consumption. It's me age you know!! I shall therefore remove the restriction and restore the system to its original state when I put the rebored cylinder and new piston together next week. However I still do not quite understand how the oil is intended to get positivly onto the cylinder wall, because the flow seems to be from the feed in the crankcase mouth, into the groove in the outside of the cylinder, after which it will run down the groove and mostly go into the crankcase and then with a bit of luck some of it may go through the small hole down onto the cylinder wall. This state of affairs will happen for my Comet because the scraper ring at bottom dead centre is only just above the lubricating hole in the cylinder and the groove with the hole drilled at a downward angle at the end, finishes below the level of the crankcase mouth - so most of the oil will go straight into the crankcase. Any comments please or is my Comet very non-standard - which I doubt because it had only been used for two years when I bought it in 1956 !! [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Cylinder Oil Feed on Comet
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