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FJR Motorcycle Forums
Technical & Mechanical Problems
RPM's at 75-80 mph?
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<blockquote data-quote="mcatrophy" data-source="post: 204667" data-attributes="member: 3187"><p>The speedo and tacho are both electromagnetic in operation, that is they work by passing current through a coil and use the magnetism to pull them round in a magnetic field.</p><p></p><p>To make them linear is difficult (read costly), and since they only need to have a limited accuracy (depending on your local vehicle regulations), you can't expect them to be overly linear or accurate. I always treat vehicle instruments as "indicators" not "meters".</p><p></p><p>A digital readout of engine or vehicle speed is more likely to be accurate (or at least linear), but I personally prefer the analogue even with its inherent inaccuracy.</p><p></p><p>In some respects, the old "mechanical" units were better ...</p></blockquote><p></p>
[QUOTE="mcatrophy, post: 204667, member: 3187"] The speedo and tacho are both electromagnetic in operation, that is they work by passing current through a coil and use the magnetism to pull them round in a magnetic field. To make them linear is difficult (read costly), and since they only need to have a limited accuracy (depending on your local vehicle regulations), you can't expect them to be overly linear or accurate. I always treat vehicle instruments as "indicators" not "meters". A digital readout of engine or vehicle speed is more likely to be accurate (or at least linear), but I personally prefer the analogue even with its inherent inaccuracy. In some respects, the old "mechanical" units were better ... [/QUOTE]
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FJR Motorcycle Forums
Technical & Mechanical Problems
RPM's at 75-80 mph?
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