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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Cylinder Lubrication
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<blockquote data-quote="davidd" data-source="post: 32356" data-attributes="member: 1177"><p>Tug,</p><p></p><p>No, DO NOT BLOCK OFF THE JET! We were discussing blocking off the oil supply feeds on the inside portion of the timing chest cover and are identifiable because they have rubber seals which need to be installed to seal the cover to the spindles. That being said, the oil supply that flows through the jet supplies the cylinders as you said, but also the camshafts. So if the jet is blocked, the supply to both the cylinders and the cam shafts is blocked. The reason to do the blocking downstream in the timing chest cover is that is where the oil supply splits so you can block only the spindle suppling the cylinder and leave the cam spindle alone.</p><p></p><p>The pressure side of the oil pump goes right to the oil filter. From there it goes into the timing cover passages and supplies the crank (below the jet) and the cylinders and cams (above the jet.) The jet is there so you can alter the bias to above or below, namely, the crank or the cams. The accepted advice is on a twin you can go from 170 to 200 to enhance the oiling of the cams when racing. This is usually considered unecessary on a Comet as the flow of oil is servicing only one cam and cylinder.</p><p></p><p>Additionally, the chamber behind the sraper in the crank case (called the recess in the diagram below) supplies the scavenge side of the pump and pushes oil up one of the exterior lines to the clinder heads where it supplies the rockers. Some of this oil dribbles down the pushrod tubes to the cams and the rest stays in the oil line that goes back to the bottom of the oil tank. Thus, even with a temporary blocking of the jet the cams and followers will recieve some oil.</p><p></p><p>I think the best way to block of the cylinder feed on a Comet is to use a solid rubber disc instead of a seal in the timing cover on the rear lifter spindle supply. This ensures full supply to the cam.</p><p></p><p>Here is a diagram from MPH:</p><p></p><p>[ATTACH=full]31971[/ATTACH]</p><p></p><p>David</p></blockquote><p></p>
[QUOTE="davidd, post: 32356, member: 1177"] Tug, No, DO NOT BLOCK OFF THE JET! We were discussing blocking off the oil supply feeds on the inside portion of the timing chest cover and are identifiable because they have rubber seals which need to be installed to seal the cover to the spindles. That being said, the oil supply that flows through the jet supplies the cylinders as you said, but also the camshafts. So if the jet is blocked, the supply to both the cylinders and the cam shafts is blocked. The reason to do the blocking downstream in the timing chest cover is that is where the oil supply splits so you can block only the spindle suppling the cylinder and leave the cam spindle alone. The pressure side of the oil pump goes right to the oil filter. From there it goes into the timing cover passages and supplies the crank (below the jet) and the cylinders and cams (above the jet.) The jet is there so you can alter the bias to above or below, namely, the crank or the cams. The accepted advice is on a twin you can go from 170 to 200 to enhance the oiling of the cams when racing. This is usually considered unecessary on a Comet as the flow of oil is servicing only one cam and cylinder. Additionally, the chamber behind the sraper in the crank case (called the recess in the diagram below) supplies the scavenge side of the pump and pushes oil up one of the exterior lines to the clinder heads where it supplies the rockers. Some of this oil dribbles down the pushrod tubes to the cams and the rest stays in the oil line that goes back to the bottom of the oil tank. Thus, even with a temporary blocking of the jet the cams and followers will recieve some oil. I think the best way to block of the cylinder feed on a Comet is to use a solid rubber disc instead of a seal in the timing cover on the rear lifter spindle supply. This ensures full supply to the cam. Here is a diagram from MPH: [ATTACH type="full"]31971[/ATTACH] David [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Cylinder Lubrication
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