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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: 58958" data-attributes="member: 1339"><p>Thanks, but afraid the back of my crankcase mouth is only 1 and one eighth inches deep so the hole through to the cylinder wall is below this level and at the bottom of a groove about a quarter of an inch wide in the outside of the cylinder liner. The bottom of the groove is at least 1 and a quarter inches down from the muffler flange</p><p>To stop the oil going virtually straight back into the crankcase with only a fraction going through the hole onto the piston, on a previous rebuild I cut a piece of 4thou shim and araldited it to the outside of the barrel wall over the groove, but leaving a small gap at the top to allow oil from the feed in the crankcase into the top of the groove. There was enough clearance between the liner and the crankcase mouth for the piece of shim.</p><p></p><p>I find it difficult to believe that otherwise there is no positive feed of oil to the cylinder and that the bike was designed like this - though I accept that with modern oils and pistons the oil feed may not be necessary.</p><p></p><p>My puzzle is how was the system ever intended to work and would like to know before I rebuild the rebored engine next week?</p><p></p><p>Maybe I'm just a nickpicky old Engineer but I do like to understand how things were supposed to work.</p><p></p><p>Matty</p></blockquote><p></p>
[QUOTE="Matty, post: 58958, member: 1339"] Thanks, but afraid the back of my crankcase mouth is only 1 and one eighth inches deep so the hole through to the cylinder wall is below this level and at the bottom of a groove about a quarter of an inch wide in the outside of the cylinder liner. The bottom of the groove is at least 1 and a quarter inches down from the muffler flange To stop the oil going virtually straight back into the crankcase with only a fraction going through the hole onto the piston, on a previous rebuild I cut a piece of 4thou shim and araldited it to the outside of the barrel wall over the groove, but leaving a small gap at the top to allow oil from the feed in the crankcase into the top of the groove. There was enough clearance between the liner and the crankcase mouth for the piece of shim. I find it difficult to believe that otherwise there is no positive feed of oil to the cylinder and that the bike was designed like this - though I accept that with modern oils and pistons the oil feed may not be necessary. My puzzle is how was the system ever intended to work and would like to know before I rebuild the rebored engine next week? Maybe I'm just a nickpicky old Engineer but I do like to understand how things were supposed to work. Matty [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Cylinder Oil Feed on Comet
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