Legal Noise Limit for exhaust?

[Trons_Brother]

Dearest cavweb members...arf

Whats the legal noise limit in decibels for exhausts? My brothers just been pulled over and told to make it quiet. Its a twin exit double pipes either side powerflow stainless steel jobbie.

Ta. :bust:

[mavvmad]

I checked this when they sound checked my zorst at Castlecombe, legal limit for road use is 98 decibels.

[goonas]

I think Bedford Autodrome says the max noise level for a car on their track is 95dB cos of public areas close by... so would guess thats the limit on the public road or maybe a bit less

[mavvmad]

eitherway you need a bloody loud zorst to go through that limit.

My GTE with a full sportex sytem made 94 decibels @ 3000 rpm :cool:

I dread to think what my cav is doing :lmao: :lmao: :O

[Trons_Brother]

Thanks for the replies, does anybody know what he should do next? Mr policeman just said "It's too loud and has got to be toned down". He wouldn't say anything about the decibel level

[goonas]

Find out the legal level from an "official" source and then get it officially measured and then go from there

[Trons_Brother]

Is a garage like ATS an official source?

[goonas]

I mean official guidlines from a police website of some kind... and any custom exhaust place could probably measure the noise level.

Or look on here: http://www.5ive-o.com/web/index.php

[mavvmad]

Did the copper measure the decibel output?
Did he give a rectalification notice?

If not dont worry about it.

[Torquemada]

I mean official guidlines from a police website of some kind... and any custom exhaust place could probably measure the noise level.

Or look on here: http://www.5ive-o.com/web/index.php

By heck !!
Thats an interesting website of ever I saw one . :D :up:

Specially this bit.
http://pepipoo.com/Section_172.htm#Loophole :cool:

The pepipoo website is better than the telly !

I love stuffing authority back down it's own throat. Hee hee. :up: :lmao:

Do we have a sticky for pepipoo? We should have ! MMODDSS! OH MMODDSS!



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[markgixxer750]

ive always thought that the legal limit for bikes was 85db but i found the following article which states its 82db

"A road-legal set-up offering similar power gains is under development, but engineers must first overcome a handful of problems. Staying within the 82dB limit for the road effectively rules out using a race can - producing about 102dB - as the basis and bringing it within legal limits."

[Torquemada]

Statutory Instrument 2001 No. 25
The Motor Vehicles (Approval) Regulations 2001

© Crown Copyright 2001

Statutory Instruments printed from this website are printed under the superintendence and authority of the Controller of HMSO being the Queen's Printer of Acts of Parliament.



Excerpt:

13 Noise and silencers 1. The vehicle shall be fitted with an exhaust system including a silencer such that the exhaust gases shall not escape into the atmosphere without first passing through the silencer.

2. When -


(a) the vehicle is held stationary on a level surface such that there is an unobstructed area not less than 3 metres wide all around the vehicle; and

(b) the engine by which the vehicle is propelled is run at a constant rotational speed of 3/4 S,


the noise measured at 0.5 metres from the exhaust outlet at 45 degrees to the axis of the outlet pipe in a horizonatal plane, shall not exceed 101db(A).


For the purposes of this item, "S" means the rotational speed at which maximum power is produced. Paragraph 1 shall only apply to vehicles propelled by an internal combustion engine.

[Torquemada]

I copied the above post, from all the relevant bits from the 'gov' erment website, after searching for hours to find the correct way to ask the search engine!! :rolleyes:

And, it seems that a drive by or casual assesment of motor vehicle noise is not legaly acceptable.
Surprise surprise.

Your car must be stationary.
Must be on level ground.
Must have 3metres of uninterrupted space around it. (presumably 'above' it too)
And the sensing microphone, presumably to an approved calibrated device, must be positoned exactly half a metre from the outlet of your tailpipe, at exactly the same height, and at 45 deg from the direction of the outlet.


Notice if you will,that this appears to apply to all vehicles!


Alternatively, get a xmas fairy from your local shop, place said fairy forcibly into exhaust outlet. Then start engine and give it right foot death/welly/rice. And measure resultant distance of aforementioned fairy from vehicle's exhaust outlet.
:lmao: :lmao: :lmao: :lmao: :lmao:


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[Dark_sta1ker]

My mini had a scaffold pole from the centre box and was throaty as hell.. sounded amazing.. I got pulled alot with it.. they always looked under the car to see if it was blowing and always let me go.

I thought the loudness reflected on the age of the car.. older cars can be louder because the law was different when it was made.

Isnt this the reason why the Escort Cossy had to stop production because it was 2db too loud?

[Trons_Brother]

Well, powerflow say its legal. Also took the car for an MOT today, the testing station said they couldn't pass it because the exhaust has been modified and is not similar to the original exhaust of the same car :confused: .

Also had the noise measured by the local councils health & safety officer. It measured 90 decibels max, then down to about 85-86.

So we are both confused about ATS today :confused:

[Torquemada]

Well, powerflow say its legal. Also took the car for an MOT today, the testing station said they couldn't pass it because the exhaust has been modified and is not similar to the original exhaust of the same car :confused: .

Also had the noise measured by the local councils health & safety officer. It measured 90 decibels max, then down to about 85-86.

So we are both confused about ATS today :confused:

Well, your MOT bloke is talking out of his exhaust ! :mad:

I copied this from the 'Gov' MOT website.
http://www.via.gov.uk/mot/your_vehicle/index.htm

Components tested during your Car MOT test
.
.
.
Exhaust System

Complete, secure, without serious leaks and silences effectively.
.
.
.

That's what he should be checking.

I don't recon he's qualified to check the type approval issues of your vehicle!

But, but, I think that an MOT tester is allowed to refuse to inspect your vehicle if he is dubious about part of it.

Go on the site and check out the FAQs.
very interesting. :up:




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[Trons_Brother]

Thanks for the reply mr torque ;). Will take me a look at the site as I'm off to ats tomorrow to shout some sense into them...arf. Surely they cant fail a test on that, cant be the only car with a stainless exhaust. :p

[PaulRobo]

shove the guys head up your zaust! What a nob jockey!! So waht about the cars that have side exits, AS SOLD BY PRO COMPANIES?? turd eater!!! I bet he wanted to sell you a new exhaust to ah??

[Marren Dan]

Regulation 54 of the Road Vehicles (Construction and Use) Regulations 1986
provides for the fitting and use of an exhaust system , including a silencer , to all vehicles propelled by an internal combustion engine.

(2) Every exhaust system and silencer shall be maintained in good and efficient working order and shall not after the date of manufacture be altered so as to increase the noise made by the escape of exhaust gases.

And from the MOT:

http://www.ukmot.com/manual/6-3.htm (http://www.ukmot.com/manual/6-3.htm)

reason for rejection.
"b. a silencer in such a condition, or of such a type, that the noise
emitted from the vehicle is clearly unreasonably above the level expected from a similar vehicle with a silencer in average condition

[Trons_Brother]

hmmm, so the mot station can reject, but the exhaust is legal...arf. More news to come later on this afternoon, when I have me a word with them ;)

[Torquemada]

reason for rejection.
"b. a silencer in such a condition, or of such a type, that the noise
emitted from the vehicle is clearly unreasonably above the level expected from a similar vehicle with a silencer in average condition

Looks slightly vague to me. And it is in the form of a guideline, which seems to make the decision discretionary on the part of the tester.



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[Trons_Brother]

Yes, that was the exact reason they gave. Now they are having to wait upon a fax from head office! So we have to wait for that now :confused:

[carlos]

Isnt this the reason why the Escort Cossy had to stop production because it was 2db too loud?
I dont know about that, but I know that certain companies can only manufacture a certain number if cars per year because of EU noise levels. I think Noble is one such company.

[Trons_Brother]

Well, bugger me (not literally..arf). Finally got the car through the mot, had to take off the system and put an old crappie one on to get it passed. Now we've got to fire the powerflow system back on in a few days, got it stamped for the :bust: .

[Torquemada]

Well, at least you're fully legal now to drive your mota around with a fekoff noisy 'zorst. :mmmm



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