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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Quiet Exhaust?
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<blockquote data-quote="Speedtwin" data-source="post: 173314" data-attributes="member: 5012"><p>Comet 120 dB at 3/4 throttle on the H scale</p><p>Rapide 140 dB AT 3/4 throttle on the H scale</p><p>Shadow 145 dB at 3/4 throttle on the H scale</p><p></p><p>Although differing measured sound volumes they all have very different sounds most likely due to types of exhaust silencers.</p><p>The H scale:</p><p>My dog Harvey is an exhaust expert this is him below relaxing in his workshop.</p><p>Harvey can hear my friends or myself approaching the house from around a mile away.</p><p>He can differentiate between bikes by their sound.</p><p></p><p>He pre warns all inside the house of the imminent arrival of a bike.</p><p>His favorite long range detection machines are Harleys which he hears from around two miles away.</p><p>He doesn't rate them, nothing on the bark scale, I put this early detection down to a lower tone.</p><p></p><p>Harvey gets the Comet at around a mile away and the Rapide can sneak right up before the Harvey alarm goes off.</p><p>He is a huge fan of pre war singles,JAP engines especially which come in at two barks or three miles away.</p><p>All I need to do is teach him to put the kettle on when he hears me coming home.</p><p></p><p>I am a firm believer in not adding extra silencers to machines loud pipes do save lives.</p><p>Enjoy the weekend and the journey.[ATTACH]59726[/ATTACH]</p><p>Al</p><p></p><p>The Vincents can get much closer before the Harvey alarm goes off.[ATTACH]59726[/ATTACH]</p></blockquote><p></p>
[QUOTE="Speedtwin, post: 173314, member: 5012"] Comet 120 dB at 3/4 throttle on the H scale Rapide 140 dB AT 3/4 throttle on the H scale Shadow 145 dB at 3/4 throttle on the H scale Although differing measured sound volumes they all have very different sounds most likely due to types of exhaust silencers. The H scale: My dog Harvey is an exhaust expert this is him below relaxing in his workshop. Harvey can hear my friends or myself approaching the house from around a mile away. He can differentiate between bikes by their sound. He pre warns all inside the house of the imminent arrival of a bike. His favorite long range detection machines are Harleys which he hears from around two miles away. He doesn't rate them, nothing on the bark scale, I put this early detection down to a lower tone. Harvey gets the Comet at around a mile away and the Rapide can sneak right up before the Harvey alarm goes off. He is a huge fan of pre war singles,JAP engines especially which come in at two barks or three miles away. All I need to do is teach him to put the kettle on when he hears me coming home. I am a firm believer in not adding extra silencers to machines loud pipes do save lives. Enjoy the weekend and the journey.[ATTACH]59726[/ATTACH] Al The Vincents can get much closer before the Harvey alarm goes off.[ATTACH]59726[/ATTACH] [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Quiet Exhaust?
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