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Vincents - A New Interest For Me
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<blockquote data-quote="Tom Gaynor" data-source="post: 8440" data-attributes="member: 4034"><p><strong>Smiths Instruments</strong></p><p></p><p>This is not true. Vincent ones read fast (by something like 1600/1550), for reasons explained in FYO - basically, by accident or design, Vincent got the rolling circumference of a 20" tyre wrong. As Robert has suggested, get the tyre size right and the speedo is suddenly accurate... (The ultimate tachometer, "the Smiths conical" was a magnetic instrument fitted as standard equipment to Manx Nortons and Matchless G50s. I have one. Independently tested, it is spot on. They were never, however, cheap. Nor indeed were the Veglia instruments fitted to Italian race bikes.)</p><p>What is remarkable is that an instrument of such high quality as the chronometric lasted so long. Luckily no-one realised that something cheaper would meet the British motorcycle industry's quality standard of "barely adequate". All instrument makers made instruments down to a price for OEM, and up to a standard for other applications. Smiths magnetic "road" clocks are probably as good as you can get for 2 1/2d per clock. That's down to BSA's accountants, not Smiths. See also under "Lucas electrics", anything you want so long as it is the cheapest on the market. Shaft drive Sunbeams have dynamos made not by Lucas Industries Ltd. (like wot you poor folks have), but by Lucas Special Equipment Ltd., and the MC45 is indeed a superior bit of kit, beautifully made. Sunbeam were prepared to pay the extra for something that worked. QED.</p><p>Modern car speedometers however read fast with a consistency that means they are made that way. Every car I've had in the last 15 years has had a speedo that registered 80 when the car was doing 74 mph, and pro-rata. Maybe the clinching argument is that one can drive without paying "optional taxes" by setting 80 on cruise control, and be sure the cameras won't flash. They will at 85...</p></blockquote><p></p>
[QUOTE="Tom Gaynor, post: 8440, member: 4034"] [b]Smiths Instruments[/b] This is not true. Vincent ones read fast (by something like 1600/1550), for reasons explained in FYO - basically, by accident or design, Vincent got the rolling circumference of a 20" tyre wrong. As Robert has suggested, get the tyre size right and the speedo is suddenly accurate... (The ultimate tachometer, "the Smiths conical" was a magnetic instrument fitted as standard equipment to Manx Nortons and Matchless G50s. I have one. Independently tested, it is spot on. They were never, however, cheap. Nor indeed were the Veglia instruments fitted to Italian race bikes.) What is remarkable is that an instrument of such high quality as the chronometric lasted so long. Luckily no-one realised that something cheaper would meet the British motorcycle industry's quality standard of "barely adequate". All instrument makers made instruments down to a price for OEM, and up to a standard for other applications. Smiths magnetic "road" clocks are probably as good as you can get for 2 1/2d per clock. That's down to BSA's accountants, not Smiths. See also under "Lucas electrics", anything you want so long as it is the cheapest on the market. Shaft drive Sunbeams have dynamos made not by Lucas Industries Ltd. (like wot you poor folks have), but by Lucas Special Equipment Ltd., and the MC45 is indeed a superior bit of kit, beautifully made. Sunbeam were prepared to pay the extra for something that worked. QED. Modern car speedometers however read fast with a consistency that means they are made that way. Every car I've had in the last 15 years has had a speedo that registered 80 when the car was doing 74 mph, and pro-rata. Maybe the clinching argument is that one can drive without paying "optional taxes" by setting 80 on cruise control, and be sure the cameras won't flash. They will at 85... [/QUOTE]
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