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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
poor quality repop silencers
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<blockquote data-quote="Black Flash" data-source="post: 109130" data-attributes="member: 433"><p>[USER=318]@Martin[/USER] </p><p>In any document we have to carry around for every road registered vehicle it states the noise of the vehicle running stationary and a noise which is now measured at 0.5 m distance from the outlet at 45 degrees at 75% of maximum RPM. </p><p>The documents show the noise in dbA. </p><p>Now a bike from 50s and early sixties was measured at a drive by 20 m distance second gear at 50 kmh and accelerating for 20 meters and suddenly shutting off. </p><p>This noise is referred in the documents with the letter N. </p><p>Officially when you measure near field you have to add 21 dB to this number plus a 20 % tolerance. </p><p>My comet has 85 N in the documents, the shadow 87,which means as long as I stay below 110 and 112 dbA accordingly with a near field measurement I am safe.</p></blockquote><p></p>
[QUOTE="Black Flash, post: 109130, member: 433"] [USER=318]@Martin[/USER] In any document we have to carry around for every road registered vehicle it states the noise of the vehicle running stationary and a noise which is now measured at 0.5 m distance from the outlet at 45 degrees at 75% of maximum RPM. The documents show the noise in dbA. Now a bike from 50s and early sixties was measured at a drive by 20 m distance second gear at 50 kmh and accelerating for 20 meters and suddenly shutting off. This noise is referred in the documents with the letter N. Officially when you measure near field you have to add 21 dB to this number plus a 20 % tolerance. My comet has 85 N in the documents, the shadow 87,which means as long as I stay below 110 and 112 dbA accordingly with a near field measurement I am safe. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
poor quality repop silencers
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