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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Is it the valve guides, the cylinder sleeve or the piston?
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<blockquote data-quote="greg brillus" data-source="post: 50869" data-attributes="member: 597"><p>Have a look down the bottom of the bores and see if the marks left by the rings are ABOVE the oil feed holes at the rear of each cylinder. Most all engines I have pulled apart, the oil holes are feeding oil between the rings......not real good for oil consumption. As Max said before, if your guides are showing up to 8 thou clearance, your oil consumption will be higher than petrol..!!! Should be more like 0.0015 to 0.002 on the inlets and half a thou more for the exhausts. If the oil holes in the liners are above the lowermost ring, you can plug them up and drill them lower. Get your heads /guides done by someone who is Vincent savvy, as most engine rebuild shops don't know how to align the upper/ lower guides correctly....I found this out years ago, got the heads back from the shop, only to find the valves way too tight in the guides, not from incorrect clearance but from poor alignment. Perhaps Trevor can explain how this is done, but experience counts big time on this issue.....Cheers.....Greg.</p></blockquote><p></p>
[QUOTE="greg brillus, post: 50869, member: 597"] Have a look down the bottom of the bores and see if the marks left by the rings are ABOVE the oil feed holes at the rear of each cylinder. Most all engines I have pulled apart, the oil holes are feeding oil between the rings......not real good for oil consumption. As Max said before, if your guides are showing up to 8 thou clearance, your oil consumption will be higher than petrol..!!! Should be more like 0.0015 to 0.002 on the inlets and half a thou more for the exhausts. If the oil holes in the liners are above the lowermost ring, you can plug them up and drill them lower. Get your heads /guides done by someone who is Vincent savvy, as most engine rebuild shops don't know how to align the upper/ lower guides correctly....I found this out years ago, got the heads back from the shop, only to find the valves way too tight in the guides, not from incorrect clearance but from poor alignment. Perhaps Trevor can explain how this is done, but experience counts big time on this issue.....Cheers.....Greg. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Is it the valve guides, the cylinder sleeve or the piston?
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