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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
CR and ignition timing on a B series single
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<blockquote data-quote="davidd" data-source="post: 100866" data-attributes="member: 1177"><p>Corey,</p><p></p><p>I don't see anything that jumps out. It is a conservative spec. I would break it in correctly so the rings bed and check the plug for heat. It is difficult to check new clean parts, but give it your best. All should be well.</p><p></p><p>The following does not necessarily involve Corey. I know that Omega pistons have been used in Vincents for years and I did not know they had a defect. Maurice Candy runs them presently in his championship Manx and has been doing so for a decade, at least.</p><p></p><p>I will say the the Carillo rods I run have slightly more clearance in the small end than the street rods. Carleton came up with this spec due to the excessive bluing on his race bike pin. This seems to happen with the racing singles. It never seemed to prove fatal, it was just an indicator. We were both running 0.020" plus clearance on the big end sides. That 0.020" is the total for both sides. It is important for the big end to get rid of the oil so the rollers don't skid and it is also important to have the big end supply oil to the underside of the piston as best it can.</p><p></p><p>We also used phosphor bronze side washers like the Manx. The hardened Vincent washers would sometimes spin under side loading. This seemed more common for the Alpha bearings than others. Spinning washers would overheat easily raising the temperature of the big end and the oil.</p><p></p><p>My memory of CCing the Vincent heads is that you need the plexiglass cut in a circle to fit the counterbore in the head. Otherwise, you have to calculate the volume of the counterbore and subtract it from the total volume. As Simon mentions, you also need to know the volume of the top of the piston that intrudes past the counterbore. The piston needs to be measured at TDC as it comes out of the liner (or fails to come out of the liner.) </p><p></p><p>When measuring the piston top pick a number that is easy to work with, lik 1". Calculate the volume of the cylinder 1" down and that is the total volume. Then put the piston in the cylinder with the top 1" down, fill to the top. You have to use the plexiglass our you will have the meniscus included in the measurement. The difference in the two volumes should tell you what to subtract from the total combustion chamber volume.</p><p></p><p>David</p></blockquote><p></p>
[QUOTE="davidd, post: 100866, member: 1177"] Corey, I don't see anything that jumps out. It is a conservative spec. I would break it in correctly so the rings bed and check the plug for heat. It is difficult to check new clean parts, but give it your best. All should be well. The following does not necessarily involve Corey. I know that Omega pistons have been used in Vincents for years and I did not know they had a defect. Maurice Candy runs them presently in his championship Manx and has been doing so for a decade, at least. I will say the the Carillo rods I run have slightly more clearance in the small end than the street rods. Carleton came up with this spec due to the excessive bluing on his race bike pin. This seems to happen with the racing singles. It never seemed to prove fatal, it was just an indicator. We were both running 0.020" plus clearance on the big end sides. That 0.020" is the total for both sides. It is important for the big end to get rid of the oil so the rollers don't skid and it is also important to have the big end supply oil to the underside of the piston as best it can. We also used phosphor bronze side washers like the Manx. The hardened Vincent washers would sometimes spin under side loading. This seemed more common for the Alpha bearings than others. Spinning washers would overheat easily raising the temperature of the big end and the oil. My memory of CCing the Vincent heads is that you need the plexiglass cut in a circle to fit the counterbore in the head. Otherwise, you have to calculate the volume of the counterbore and subtract it from the total volume. As Simon mentions, you also need to know the volume of the top of the piston that intrudes past the counterbore. The piston needs to be measured at TDC as it comes out of the liner (or fails to come out of the liner.) When measuring the piston top pick a number that is easy to work with, lik 1". Calculate the volume of the cylinder 1" down and that is the total volume. Then put the piston in the cylinder with the top 1" down, fill to the top. You have to use the plexiglass our you will have the meniscus included in the measurement. The difference in the two volumes should tell you what to subtract from the total combustion chamber volume. David [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
CR and ignition timing on a B series single
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