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<blockquote data-quote="Tom Gaynor" data-source="post: 6439" data-attributes="member: 4034"><p><strong>Horsepower</strong></p><p></p><p>I was 11th at Chimay behind 5 Patons, an MV3, and 4 short stroke Manx Nortons, 90, 92, or 95, whatever, on my (as Norton made them) 86 bore. The bike was pulling 146 mph on the back part of the circuit, 8300 rpm. This means a quick bike, because the rider will never see 65 again.</p><p>According to the dyno on which I set up ignition timing, and benchmarked fueling, it was developing 43.6 bhp at its peak, 7200 rpm. This was measured at the rear wheel on an eddy current dyno. An inertia dyno (e.g. Dynajet) would have shown a lot more. A dyno is a comparator, showing how various states of tune work. The figures from different dynos are not comparable.</p><p>(It is well known that if one wants to sell a bike to the hard of thinking as super-tuned, then there are certain dynos that give far better figures than others. This is not to suggest that big bore Comets won't pull up tree stumps, but if Bob Dunn Comets are to be compared with, say, Ben Kingham's Comet, it has to be on the same dyno.) </p><p>Anyone who thinks that I only know this by reading Graham Bell's invaluable and highly recommended book on four stroke engine tuning is exactly right. And it doesn't set off even the most sensitive bullsh*t detector......</p><p>(Dick Linton is the doyen of Aermacchi tuners. He's fond of quoting an American tuner who said "Horsepower sells motorcycles: torque wins races...."</p></blockquote><p></p>
[QUOTE="Tom Gaynor, post: 6439, member: 4034"] [b]Horsepower[/b] I was 11th at Chimay behind 5 Patons, an MV3, and 4 short stroke Manx Nortons, 90, 92, or 95, whatever, on my (as Norton made them) 86 bore. The bike was pulling 146 mph on the back part of the circuit, 8300 rpm. This means a quick bike, because the rider will never see 65 again. According to the dyno on which I set up ignition timing, and benchmarked fueling, it was developing 43.6 bhp at its peak, 7200 rpm. This was measured at the rear wheel on an eddy current dyno. An inertia dyno (e.g. Dynajet) would have shown a lot more. A dyno is a comparator, showing how various states of tune work. The figures from different dynos are not comparable. (It is well known that if one wants to sell a bike to the hard of thinking as super-tuned, then there are certain dynos that give far better figures than others. This is not to suggest that big bore Comets won't pull up tree stumps, but if Bob Dunn Comets are to be compared with, say, Ben Kingham's Comet, it has to be on the same dyno.) Anyone who thinks that I only know this by reading Graham Bell's invaluable and highly recommended book on four stroke engine tuning is exactly right. And it doesn't set off even the most sensitive bullsh*t detector...... (Dick Linton is the doyen of Aermacchi tuners. He's fond of quoting an American tuner who said "Horsepower sells motorcycles: torque wins races...." [/QUOTE]
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