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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Crank Case Inspection
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<blockquote data-quote="Nigel Spaxman" data-source="post: 69356" data-attributes="member: 2907"><p>PT</p><p></p><p>I can see that the way your cases were cut is a lot nicer than the way mine are done. By welding I can correct some of that.</p><p>Probably the rear casting you have would simplify what I want to do with my bike. When you get a chance send me a picture and maybe I can arrange to purchase those bits from you. I like the way you went. The other way would be to put a Commando primary on, but then you are committed to a crank driven alternator, and you have to give up the ESA which I like. </p><p></p><p> I know what you mean about splines but tapers are really good too. There are as many bad examples of each. On BMW airheads the splines on the rear drive wear out, almost the same set up on Moto Guzzis almost never wears out. The trouble with spines is once there is a little wear tightening the bolt on the end won't actually take the play out, especially when there is a reversing load. At work we often use to connect a Gates Poly Chain pulley onto a spline hydraulic motor shaft, a split tapered insert, tapered on the outside, and involute splined on the inside. When the pulley is pulled down the taper squeezes the whole thing together and nothing moves.</p><p></p><p>The 90 bore kit I have was purchased from the estate of the late John McDougal who was one of the f0remost Vincent experts in our area (Vancouver Section) There are a lot of experts around here though. It has Maughans billet cylinder muffs and iron liners. Those parts still have to be fitted together. It has some forged Venolia pistons that are around 11:1 compression. Tony Cording has the identical stuff on his Comet and it works really well. I think that John took the compression down to about 10.5:1 on Tony's engine by fitting compression plates. I think that is about what I want to aim for as well.</p><p></p><p>What kind of Guzzi do you have? I have owned two, a 850 Lemans and a V11 Lemans. They were great bikes.</p></blockquote><p></p>
[QUOTE="Nigel Spaxman, post: 69356, member: 2907"] PT I can see that the way your cases were cut is a lot nicer than the way mine are done. By welding I can correct some of that. Probably the rear casting you have would simplify what I want to do with my bike. When you get a chance send me a picture and maybe I can arrange to purchase those bits from you. I like the way you went. The other way would be to put a Commando primary on, but then you are committed to a crank driven alternator, and you have to give up the ESA which I like. I know what you mean about splines but tapers are really good too. There are as many bad examples of each. On BMW airheads the splines on the rear drive wear out, almost the same set up on Moto Guzzis almost never wears out. The trouble with spines is once there is a little wear tightening the bolt on the end won't actually take the play out, especially when there is a reversing load. At work we often use to connect a Gates Poly Chain pulley onto a spline hydraulic motor shaft, a split tapered insert, tapered on the outside, and involute splined on the inside. When the pulley is pulled down the taper squeezes the whole thing together and nothing moves. The 90 bore kit I have was purchased from the estate of the late John McDougal who was one of the f0remost Vincent experts in our area (Vancouver Section) There are a lot of experts around here though. It has Maughans billet cylinder muffs and iron liners. Those parts still have to be fitted together. It has some forged Venolia pistons that are around 11:1 compression. Tony Cording has the identical stuff on his Comet and it works really well. I think that John took the compression down to about 10.5:1 on Tony's engine by fitting compression plates. I think that is about what I want to aim for as well. What kind of Guzzi do you have? I have owned two, a 850 Lemans and a V11 Lemans. They were great bikes. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Crank Case Inspection
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