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Re: Why Exhausts are Ever Quieter [Re: Peter J] #634658
03/05/20 08:12 AM
03/05/20 08:12 AM
Joined: Feb 2016
Posts: 2,623
East Harling, Norfolk UK
Richard Wood Offline
Talk Morgan Expert
Happy Birthday Richard Wood  Offline
Talk Morgan Expert

Joined: Feb 2016
Posts: 2,623
East Harling, Norfolk UK
Too louder exhaust note drowns the possibly more agreeable induction note heard and enjoyed by the driver rather more than pedestrians. I'm thinking of my Roadster (with extra 4 inch hole in airbox) as it passes through 3500 rpm. Poor mans V8 [Linked Image]

Last edited by Richard Wood; 03/05/20 08:14 AM.

Richard

2018 Roadster - Red/Magnolia - "Morton"
1966 Land Rover series 2a SWB
1960 Velocette Venom
Re: Why Exhausts are Ever Quieter [Re: Peter J] #634833
03/05/20 07:33 PM
03/05/20 07:33 PM
Joined: Sep 2011
Posts: 13,241
Mandello del Lario
Gambalunga Offline
Member of the Inner Circle
Gambalunga  Offline
Member of the Inner Circle

Joined: Sep 2011
Posts: 13,241
Mandello del Lario
I don't know about the UK but in most countries it is illegal to modify exhaust system, remove cats, etc. Naturally I would never do such a thing innocent


Peter

[Linked Image]
Re: Why Exhausts are Ever Quieter [Re: Peter J] #634892
04/05/20 06:27 AM
04/05/20 06:27 AM
Joined: Apr 2012
Posts: 4,635
Surrey. UK
Neilda Offline
Part of the Furniture
Neilda  Offline
Part of the Furniture

Joined: Apr 2012
Posts: 4,635
Surrey. UK
The law is buried in here somewhere:

https://eur-lex.europa.eu/legal-content/EN/TXT/PDF/?uri=CELEX:32014R0540&from=EN

If you have an allergy to Horlicks, it's the perfect document.


+8 4.8
Re: Why Exhausts are Ever Quieter [Re: Peter J] #634931
04/05/20 09:04 AM
04/05/20 09:04 AM
Joined: Mar 2009
Posts: 7,121
Hampshire
Alistair Online happy
Smile, it confuses them
Alistair  Online Happy
Smile, it confuses them
Talk Morgan Guru

Joined: Mar 2009
Posts: 7,121
Hampshire
For the UK the MoT will test the car against rated factory settings.

You have three years prior to this, however this is usually during the warranty so anything done to the car will probably invalidate this!

I do know slightly mad people who de-cat and adjust the exhaust on almost new cars but then more money than sense springs to mind given the way I have seen them drive.

Last edited by Alistair; 04/05/20 09:47 AM.

Just time to burn a little more petrol before dinner.
Re: Why Exhausts are Ever Quieter [Re: Peter J] #634944
04/05/20 09:31 AM
04/05/20 09:31 AM
Joined: Jul 2019
Posts: 975
L
Luddite Offline
Talk Morgan Regular
Luddite  Offline
Talk Morgan Regular
L

Joined: Jul 2019
Posts: 975
Richard, I too enjoy the sound of induction never more so than when messing around balancing the twin Webers on my Elans many years ago, though for a real sense of induction roar while in the drivers seat, it must be hard to beat a mini with the Weber protruding into the passenger compartment through the hole in the bulkhead where the speedometer used to live.... Backfires, and wearing loose items of clothing were best avoided for sure...

Running an older car sans electronic and emission gubbins can have its advantages, but even my car did not escape completely as it is fitted with an auto choke mechanism where I would much prefer a simple choke cable. but then best not to get too cocky for older cars like mine may be amongst the first to suffer some sort of legislative decree if Climate change really takes hold in time. and even at this time cars without cats are seemingly banned from some cities outside the UK..? NOT that I tended to frequent large cities by choice while touring... I suspect I may be one of the very few who just drove past Rome while touring Italy in my old Morgan..!!!

Re: Why Exhausts are Ever Quieter [Re: Alistair] #634957
04/05/20 10:12 AM
04/05/20 10:12 AM
Joined: Aug 2013
Posts: 12,577
Salisbury, UK
Peter J Offline OP
Formerly known as Aldermog
Peter J  Offline OP
Formerly known as Aldermog
Member of the Inner Circle

Joined: Aug 2013
Posts: 12,577
Salisbury, UK
Originally Posted by Alistair
For the UK the MoT will test the car against rated factory settings.


Not Quite....

From May 2018
Noise suppression system

The Tester will inspect:

exhaust silencers
under-bonnet noise deadening material fitted as original equipment.
Exhaust noise will be assessed during the emissions test for the vehicle or by revving the engine to around 2,500rpm or half the maximum engine speed if this is lower on vehicles not subject to an emissions test

Exhaust noise from the vehicle must not be unreasonably above the noise level normally expected from a similar vehicle with a standard silencer in average condition.

No mention of using a sound pressure meter.

Also, to become a MOT Tester you do not need a hearing test.


Peter,
Tarka the 'Otter Mog
2014 Plus 8


Re: Why Exhausts are Ever Quieter [Re: Peter J] #635022
04/05/20 12:04 PM
04/05/20 12:04 PM
Joined: Jul 2019
Posts: 975
L
Luddite Offline
Talk Morgan Regular
Luddite  Offline
Talk Morgan Regular
L

Joined: Jul 2019
Posts: 975
Peter, thanks for providing the extra detail. good to see that there seems to still exist some grey areas in legislation...(-:

As far as my memory allows my +8 sits at circa 2500rpm in 5th at 70mph purring along reasonably quietly, other than wind noise..(-: In reality noise production on my old Mog depends upon not just the revs but the amount of throttle pedal pressure applied to get there..(-:

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