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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Dynamo overhaul.
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<blockquote data-quote="Tom Gaynor" data-source="post: 7001" data-attributes="member: 4034"><p><strong>Alton reliability</strong></p><p></p><p>As far as I know, only the 3-phase Altons have given trouble. The single phase ones (the original model and the current one) are no bother.(*) I think the 3-phase might have been an attempt to get more oomph at low revs from a alternator small enough to go into a dynamo housing.</p><p>The dynamo is run over engine speed (engine sprocket / dynamo sprocket x rpm, hazy memory says 15% over) and at 30 mph that's only 1600 rpm. My Sunbeam S7, with 4 1/2" pancake dynamo is turning about 2300 at that speed. Presumably that's why the Alton has an epicyclic box, to overspeed it still further.</p><p>* Those who have heard me muttering about unreliable electrics should know that in every case to date except the three-phase referred to, the fundamental problem was allowing an electrical idiot to do the wiring. No prizes for guessing who THAT is, then.</p></blockquote><p></p>
[QUOTE="Tom Gaynor, post: 7001, member: 4034"] [b]Alton reliability[/b] As far as I know, only the 3-phase Altons have given trouble. The single phase ones (the original model and the current one) are no bother.(*) I think the 3-phase might have been an attempt to get more oomph at low revs from a alternator small enough to go into a dynamo housing. The dynamo is run over engine speed (engine sprocket / dynamo sprocket x rpm, hazy memory says 15% over) and at 30 mph that's only 1600 rpm. My Sunbeam S7, with 4 1/2" pancake dynamo is turning about 2300 at that speed. Presumably that's why the Alton has an epicyclic box, to overspeed it still further. * Those who have heard me muttering about unreliable electrics should know that in every case to date except the three-phase referred to, the fundamental problem was allowing an electrical idiot to do the wiring. No prizes for guessing who THAT is, then. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Dynamo overhaul.
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