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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Series D Distributor wanted because Boyer quit, again.
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<blockquote data-quote="Simon Dinsdale" data-source="post: 25714" data-attributes="member: 58"><p>Yes. Using two sets of points on slotted carriers allows you move each points seperately in an arc around the shaft and set the timing on each cylinder seperately. The Ford points been identical but mirror image of each other allows you to get the heals of the points closer together on the arc around the shaft (as against 180 degrees on a vertical twin) to allow for the twins 50 degrees between cylinders. Then the cam only needs one lobe which is easy to make. Its the points position and the use of two points that allows for only one cam lobe.</p><p></p><p>I am not saying that the principle of electronic ignition is faulty, but there seems to be a lot of discussion of units failing on this forum. Norton Commandoes may rattle their ATD to pieces, but they are on vertical twins which are known for vibration. </p><p></p><p>Electronics on modern cars go through a very costly design and development process with testing and designing to pass very harsh enviromental tests. These tests been a very big costly exercise. I cannot believe somebody selling electronic modules for classic bikes in the quantity of hundreds per year will have subjected and developed their designs to such enviromental shock / vibration / thermal / humidity etc where the costs of testing can go into £thousands per day to British and Euro standards. I worked for a company that produced a microwave sensor based car alarm. The design and enviromental development cost were £200,000+ where the acceptable failure rate was a lot less than 0.01%. I bet a lot of electronic ignition units for classic bikes never went through this design process. If they had, the current discussion about failures wouldn't be happening. </p><p>Most if not all new cars now days use modern electronics. Yes a few may fail, but most don't and their production runs are larger than aftermarket ignition units for classic bikes.</p></blockquote><p></p>
[QUOTE="Simon Dinsdale, post: 25714, member: 58"] Yes. Using two sets of points on slotted carriers allows you move each points seperately in an arc around the shaft and set the timing on each cylinder seperately. The Ford points been identical but mirror image of each other allows you to get the heals of the points closer together on the arc around the shaft (as against 180 degrees on a vertical twin) to allow for the twins 50 degrees between cylinders. Then the cam only needs one lobe which is easy to make. Its the points position and the use of two points that allows for only one cam lobe. I am not saying that the principle of electronic ignition is faulty, but there seems to be a lot of discussion of units failing on this forum. Norton Commandoes may rattle their ATD to pieces, but they are on vertical twins which are known for vibration. Electronics on modern cars go through a very costly design and development process with testing and designing to pass very harsh enviromental tests. These tests been a very big costly exercise. I cannot believe somebody selling electronic modules for classic bikes in the quantity of hundreds per year will have subjected and developed their designs to such enviromental shock / vibration / thermal / humidity etc where the costs of testing can go into £thousands per day to British and Euro standards. I worked for a company that produced a microwave sensor based car alarm. The design and enviromental development cost were £200,000+ where the acceptable failure rate was a lot less than 0.01%. I bet a lot of electronic ignition units for classic bikes never went through this design process. If they had, the current discussion about failures wouldn't be happening. Most if not all new cars now days use modern electronics. Yes a few may fail, but most don't and their production runs are larger than aftermarket ignition units for classic bikes. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Series D Distributor wanted because Boyer quit, again.
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