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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Alton generator
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<blockquote data-quote="Little Honda" data-source="post: 108448" data-attributes="member: 667"><p>Vic,</p><p>all your reflections about the gear drive between electronic ignition pick-up at half engine speed and app.</p><p>1,3 times engine speed at the generator shaft of the Hegeler generator are purely theoretical. This item has</p><p>been tested on a Comet for at least 5000 mls plus some on a twin, but mainly Comet, because in this case</p><p>load changes and rev level is always higher, than on any twin.</p><p>The durability of gear life is solely a question of engineering. In the Hegeler generator (see pic on his homepage) the internal gearing has been copied from a Vespa drive, which has a very similar construction.</p><p>As you probably know, there are in general two gear forms: a) for low friction, like in watches and clocks, and</p><p>those for max torque, like in the Vespa drive. Latter ones have a vertical line, going through the touching point of a tangental line on the radius of the tooth and through its radius centre. This touching point depends on the tooth form used and may leed to a track of the vertical line outside the root area of the tooth. The strongest</p><p>tooth has a form, which lets the vertical line pass through the middle of the root area without leaving it. In this tooth form, some friction is the price for its strength, asking for good internal lubrication.</p><p>As a Vespa scooter drive survives a multiple of possible loads achievable in a 150W- generator, this solution</p><p>seems to be a much more reliable and better solution engineeringwise, than charging the middle rolls of your triplex chain by app. 3 times the load of the original Lucas dynamo, using a very small sprocket, coupled to the dynamo by the same flimpsy two bolt coupling of the original drive. Broken middle rolls of the triplex chain</p><p>are not rarely seen on dynamo drives of Alton generators.</p><p>There are also sometimes complaints about the lack of precision of ignition adjustment, when fitted at the</p><p>end of the timing gears, as on the Hegeler device, which is caused by not understanding, how it works and</p><p>not asking, why it is working so exceptionally well. At first, some 5 - 6 deg. variation of the ignition point sound</p><p>inacceptably high, but may only be evident, when your timing gears are not adjusted to works standards.</p><p>Moreover, when you use a strobe light to adust your timing, this is precise to half a degree of crank rotation</p><p>in all cases, as in ignition point, all timing gears are unter pressure at the same side of the gears of the teeth</p><p>involved, ie., no clearance at all, visible by your strobe light. After ignition, during the next rotation to the</p><p>next ignition, it does not matter, if there may be some load changes in your timing drive, as there is no spark.</p><p>All those, who have ridden Hegeler ignited engines will confirm, that they run very smoothly with a strong</p><p>torque at easy starting and a safe tick-over, and did not have any break-downs, so far.</p><p>By these reasons, to my impression, ignition and generator-locationwise, there is no better solution available</p><p>at present, than the Hegeler system. Moreover, in consequence, it frees the best location possible for a</p><p>starter motor, which is in place of the original dynamo, with no loads on the primary chain and thereby no</p><p>reported damages to the triplex chain, so far. But this is another subject.</p></blockquote><p></p>
[QUOTE="Little Honda, post: 108448, member: 667"] Vic, all your reflections about the gear drive between electronic ignition pick-up at half engine speed and app. 1,3 times engine speed at the generator shaft of the Hegeler generator are purely theoretical. This item has been tested on a Comet for at least 5000 mls plus some on a twin, but mainly Comet, because in this case load changes and rev level is always higher, than on any twin. The durability of gear life is solely a question of engineering. In the Hegeler generator (see pic on his homepage) the internal gearing has been copied from a Vespa drive, which has a very similar construction. As you probably know, there are in general two gear forms: a) for low friction, like in watches and clocks, and those for max torque, like in the Vespa drive. Latter ones have a vertical line, going through the touching point of a tangental line on the radius of the tooth and through its radius centre. This touching point depends on the tooth form used and may leed to a track of the vertical line outside the root area of the tooth. The strongest tooth has a form, which lets the vertical line pass through the middle of the root area without leaving it. In this tooth form, some friction is the price for its strength, asking for good internal lubrication. As a Vespa scooter drive survives a multiple of possible loads achievable in a 150W- generator, this solution seems to be a much more reliable and better solution engineeringwise, than charging the middle rolls of your triplex chain by app. 3 times the load of the original Lucas dynamo, using a very small sprocket, coupled to the dynamo by the same flimpsy two bolt coupling of the original drive. Broken middle rolls of the triplex chain are not rarely seen on dynamo drives of Alton generators. There are also sometimes complaints about the lack of precision of ignition adjustment, when fitted at the end of the timing gears, as on the Hegeler device, which is caused by not understanding, how it works and not asking, why it is working so exceptionally well. At first, some 5 - 6 deg. variation of the ignition point sound inacceptably high, but may only be evident, when your timing gears are not adjusted to works standards. Moreover, when you use a strobe light to adust your timing, this is precise to half a degree of crank rotation in all cases, as in ignition point, all timing gears are unter pressure at the same side of the gears of the teeth involved, ie., no clearance at all, visible by your strobe light. After ignition, during the next rotation to the next ignition, it does not matter, if there may be some load changes in your timing drive, as there is no spark. All those, who have ridden Hegeler ignited engines will confirm, that they run very smoothly with a strong torque at easy starting and a safe tick-over, and did not have any break-downs, so far. By these reasons, to my impression, ignition and generator-locationwise, there is no better solution available at present, than the Hegeler system. Moreover, in consequence, it frees the best location possible for a starter motor, which is in place of the original dynamo, with no loads on the primary chain and thereby no reported damages to the triplex chain, so far. But this is another subject. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Alton generator
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