...hadn't dared hope that Bill, but be a nice place to be...
Exactly what documents are you referring to??I have an old and rusty burgess absorption type silencer lying around in my garage.
This silencer also has a perforated disc fitted about midway in the silencer.
The straight through one I bought from Armours [perfect chrome and polish btw] about a year ago does not have this disc inside.
I also got one for my friend Dieter and everyone says it is very noisy. On his way back from a brit bike meeting near Switzerland he got stopped by the police in the tourist area of the black forest because of the noise.
When he showed them the documents with the old noise emission typed in there, the police gave up on him and he happily rode away.
Ahh - so its a EU thing. See my earlier post #92. Life is so much easier here in the penal colonies!@Martin
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.
Thats quite a noise! I am surprised seeing race circuits in UK are at about 105Db.@Martin
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.