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1973 +8, exhaust fumes in cabin #746893
04/07/22 08:18 PM
04/07/22 08:18 PM
Joined: Feb 2022
Posts: 31
Korsor, Denmark
S
Sensei Offline OP
Just Getting Started
Sensei  Offline OP
Just Getting Started
S

Joined: Feb 2022
Posts: 31
Korsor, Denmark
Hi all, we finally passed the MOT test and got the newly acquired 1973 +8 RHD on the road. However, to the annoyance of especially my wife, we find the extend of exhaust fumes in the cabin excessive. True, it's not very nice. We feel kind of intoxicated and our clothes and hair is smelling afterwards. I predict that wife will not go on longer trips in the Moggie. Arrg...Many others must have encountered this. How to rectify it? The Mog does have a big bore system with rather long rear tail pipes. Install an after market catatalytic converter? New plugs? Carburettor adjustments..? Cheers /Finn

Last edited by Sensei; 04/07/22 08:20 PM.

Finn. 1973 Morgan +8. 1959 Austin Healey 3000 BN7 2-seater. 2009 Mazda MX-5 2.0 PRHT.

Re: 1973 +8, exhaust fumes in cabin [Re: Sensei] #746902
04/07/22 09:00 PM
04/07/22 09:00 PM
Joined: Feb 2016
Posts: 5,114
East Harling, Norfolk UK
RichardV6 Offline
Charter Member
RichardV6  Offline
Charter Member

Joined: Feb 2016
Posts: 5,114
East Harling, Norfolk UK
Or side pipes. Fumes get swept away then.


Richard

2018 Roadster - Red/Magnolia - "Morton"
1966 Land Rover series 2a SWB
1945 Moto Guzzi Airone
Re: 1973 +8, exhaust fumes in cabin [Re: Sensei] #746904
04/07/22 09:13 PM
04/07/22 09:13 PM
Joined: Mar 2011
Posts: 645
Cambridge UK
S
Stephen888 Offline
Talk Morgan Regular
Stephen888  Offline
Talk Morgan Regular
S

Joined: Mar 2011
Posts: 645
Cambridge UK
I have struggled over the years with the same problem. (1980 +8) . Extended the rear pipes, but then kept catching my legs when walking around the back or filling with fuel. But found the only option is side pipes. Be warned though they are louder.


1980 +8 Blue
----------------
Stephen
Re: 1973 +8, exhaust fumes in cabin [Re: Sensei] #746909
04/07/22 09:17 PM
04/07/22 09:17 PM
Joined: Feb 2022
Posts: 31
Korsor, Denmark
S
Sensei Offline OP
Just Getting Started
Sensei  Offline OP
Just Getting Started
S

Joined: Feb 2022
Posts: 31
Korsor, Denmark
Thx for your replies. I've been thinking of side pipes, but what about slow driving in cities etc. Won't it go right into the face of the occupants?


Finn. 1973 Morgan +8. 1959 Austin Healey 3000 BN7 2-seater. 2009 Mazda MX-5 2.0 PRHT.

Re: 1973 +8, exhaust fumes in cabin [Re: Sensei] #746922
05/07/22 05:41 AM
05/07/22 05:41 AM
Joined: Aug 2009
Posts: 630
Cheltenham - UK
D
dmh Offline
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dmh  Offline
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Joined: Aug 2009
Posts: 630
Cheltenham - UK
Our 2011 3.0 litre Roadster - side pipes from new - no fumes in cabin or excess noise.

Good Luck


David H
Re: 1973 +8, exhaust fumes in cabin [Re: Sensei] #746934
05/07/22 07:00 AM
05/07/22 07:00 AM
Joined: Feb 2016
Posts: 5,114
East Harling, Norfolk UK
RichardV6 Offline
Charter Member
RichardV6  Offline
Charter Member

Joined: Feb 2016
Posts: 5,114
East Harling, Norfolk UK
Originally Posted by Sensei
Thx for your replies. I've been thinking of side pipes, but what about slow driving in cities etc. Won't it go right into the face of the occupants?

No because they point downwards slightly. They don't need to add excessive noise either. At idle mine are near silent and only turn into a banshee wail from the V6 above 3500 rpm when the VVT cuts in.


Richard

2018 Roadster - Red/Magnolia - "Morton"
1966 Land Rover series 2a SWB
1945 Moto Guzzi Airone
Re: 1973 +8, exhaust fumes in cabin [Re: Sensei] #746943
05/07/22 08:05 AM
05/07/22 08:05 AM
Joined: Sep 2016
Posts: 992
Chester, UK
Grumpy2 Online content
Talk Morgan Regular
Grumpy2  Online Content
Talk Morgan Regular

Joined: Sep 2016
Posts: 992
Chester, UK
Mine has side pipes for exactly the same reason. Fitted the rear pipes and got exhaust smell. Side pipes and no smell. Make a fine noise too especially in tunnels.

Very easy to adapt and fit and reversible too


94 plus 8 in Westminster Green - I think!
Re: 1973 +8, exhaust fumes in cabin [Re: Sensei] #746944
05/07/22 08:07 AM
05/07/22 08:07 AM
Joined: Sep 2014
Posts: 2,122
London
MOG 615 Offline
Talk Morgan Expert
MOG 615  Offline
Talk Morgan Expert

Joined: Sep 2014
Posts: 2,122
London
Finn

The side pipes solution is a good one, but the noise can be louder under certain circumstances. If this proves too much get some different silencers with more packing in them to give better sound absorption.

You can experiment by getting a couple of 90 Deg curved end pipes made up cheaply and just trying them. If you find that this solution suits you then get them done in stainless.

Personally I like the noise generated by side pipes (like Richard !) but it is a personal choice.

On my racing +4 I had a long pipe system with a good silencer , but the system developed a resonance and would fail noise tests at circuits like Zanndvort and Goodwood. I changed the system to a +8 silencer and a side exit just in front the rear wheel , and the system was a lot quieter , no resonance, I passed all the noise meter tests first time, and it was fine on the road. As Richard says it is no more noisy in steady state than the standard system , but will be louder under acceleration.


Andy G
1999 +8 , Indigo Blue.
Ex-John McKecknie/Mike Duncan 1955 +4 racer.
Re: 1973 +8, exhaust fumes in cabin [Re: Sensei] #746948
05/07/22 08:20 AM
05/07/22 08:20 AM
Joined: Mar 2009
Posts: 3,047
N
nick w Offline
Talk Morgan Addict
nick w  Offline
Talk Morgan Addict
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Joined: Mar 2009
Posts: 3,047
Chrome curved endpipe screw on fittings available on eBay, I fitted them on a car and directed the fumes 45 degrees out to side. Worked well. But fumes are always a problem even if the modern cars don't emit odour. On my last 4/4 I could smell exhaust starting from cold but not once the catalysts warmed up. But the airflow remains the same
Nick

Re: 1973 +8, exhaust fumes in cabin [Re: nick w] #747112
06/07/22 02:57 PM
06/07/22 02:57 PM
Joined: Jul 2007
Posts: 26,839
Cheltenham, Glos. UK
Graham, G4FUJ Offline
Salty Sea Dog
Graham, G4FUJ  Offline
Salty Sea Dog
Member of the Inner Circle

Joined: Jul 2007
Posts: 26,839
Cheltenham, Glos. UK
Originally Posted by nick w
Chrome curved endpipe screw on fittings available on eBay,
Nick

And from many automotive accessory shops, even Halfrauds smile


Graham (G4FUJ)

D8921 L44FOR '93 4/4 Giallo Fly 2 seat smile
'90 LR 90 SW
'09 Alfa Romeo MiTo
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