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Wales
by Joske Vermeule, September 1
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Forums39
Topics49,881
Posts837,805
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Most Online1,063
Jun 14th, 2026
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Joined: Feb 2010
Posts: 1,415
Has a lot to Say!
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Has a lot to Say!
Joined: Feb 2010
Posts: 1,415 |
I have to come back to this thread, to update.....................
Apparently the Morgan racers who use wrapped headers/exhaust manifold are finding that the increased exhaust gas temperature is reducing catalytic converter life, in some cases to a few hundred miles. The increased temperature is melting the innards and partially blocking the exhaust, so reducing power.
Obviously racing is a much harder test of the catalytic converter innards, and there are many different specs of cat for road and track. FIA approved cats are available for circuit use.
But this has made me nervous, so today I removed my exhaust wrap. I'm not saying a word, but its nothing to do with the exhaust wrap.....
Simon @ Sifab.co.uk
Sifabtemporary@gmail.com
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Joined: Dec 2008
Posts: 22,367 Likes: 354
Roadster Guru Member of the Inner Circle
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OP
Roadster Guru Member of the Inner Circle
Joined: Dec 2008
Posts: 22,367 Likes: 354 |
DaveW
'05 Red Roadster S1
'16 Yellow (Not the only) Narrow AR GDI Plus 4
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Joined: Jul 2007
Posts: 27,825 Likes: 753
Member of the Inner Circle
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Member of the Inner Circle
Joined: Jul 2007
Posts: 27,825 Likes: 753 |
Other noxous substances to raise the fuels energy I am guessing
JohnV6
2022 CX Plus Four
2025 Renault Scenic Alpine etech "Yvette"
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Joined: Sep 2009
Posts: 7,435 Likes: 122
Talk Morgan Guru
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Talk Morgan Guru
Joined: Sep 2009
Posts: 7,435 Likes: 122 |
I have wrapped my manifold for over 60,000 km. All,ok. Besides, the metal cat can withstand more heat anyway. With the wrapping of the manifold it heats up faster and I also think that the exhaust fumes stay hotter and therefore are discharged faster so that new air can be sucked in better.
'14 4/4 graphite grey
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Joined: Feb 2010
Posts: 1,415
Has a lot to Say!
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Has a lot to Say!
Joined: Feb 2010
Posts: 1,415 |
Other noxous substances to raise the fuels energy I am guessing Nope We have to run pump fuel....
Simon @ Sifab.co.uk
Sifabtemporary@gmail.com
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Joined: Aug 2009
Posts: 155
L - Learner Plates On
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L - Learner Plates On
Joined: Aug 2009
Posts: 155 |
Could it be that the original cats fitted by the factory were pretty crap anyway?
Has anyone independently tested an original equipment AR sports cat during the three years before its MoT is due, I wonder? My sports-exhaust equiped Roadster has passed its MoTs, but 'only just' - thanks to an understanding tester.
Sid
Ex 2014 3.7 Roadster in Ferrari Le Mans Blue
Ex Indigo Blue '99 +4
Ex MogMMX Innovations winner
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Joined: Feb 2010
Posts: 1,415
Has a lot to Say!
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Has a lot to Say!
Joined: Feb 2010
Posts: 1,415 |
Could it be that the original cats fitted by the factory were pretty crap anyway?
Has anyone independently tested an original equipment AR sports cat during the three years before its MoT is due, I wonder? My sports-exhaust equiped Roadster has passed its MoTs, but 'only just' - thanks to an understanding tester. 
Simon @ Sifab.co.uk
Sifabtemporary@gmail.com
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Joined: May 2010
Posts: 9,551 Likes: 134
Needs to Get Out More!
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Needs to Get Out More!
Joined: May 2010
Posts: 9,551 Likes: 134 |
My Plus8 is having an MOT next week. It has consistently been borderline on Lambda at top end when delving through previous owner MOT’s. However, checking the old MOT cert from last year it states limit is 1.03. In the DVLA website the emissions doc ( version 19) shows in the annex that Morgans have an upper limit of 1.05. The car passed last year with a reading of 1.03. I will wait and see what the test shows.
Question for an MOT expert...how would the emissions testing machine be set up to deal with the higher end Morgan limit? Can it be preset or a manual adjustment made if >1.03 is found?
Plus Four MY23 Furka Rouge
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Joined: Dec 2008
Posts: 22,367 Likes: 354
Roadster Guru Member of the Inner Circle
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OP
Roadster Guru Member of the Inner Circle
Joined: Dec 2008
Posts: 22,367 Likes: 354 |
My Plus8 is having an MOT next week. It has consistently been borderline on Lambda at top end when delving through previous owner MOT’s. However, checking the old MOT cert from last year it states limit is 1.03. In the DVLA website the emissions doc ( version 19) shows in the annex that Morgans have an upper limit of 1.05. The car passed last year with a reading of 1.03. I will wait and see what the test shows.
Question for an MOT expert...how would the emissions testing machine be set up to deal with the higher end Morgan limit? Can it be preset or a manual adjustment made if >1.03 is found? It's all a bit unclear. My Roadster with a K&N was always right on 1.03, but it was never a problem because I know the tester over many years. I printed the page off just in case there was a query, but he was relaxed about it. With the standard air filter, the lambda drops below 1.03.
DaveW
'05 Red Roadster S1
'16 Yellow (Not the only) Narrow AR GDI Plus 4
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Joined: Sep 2011
Posts: 14,748 Likes: 158
Member of the Inner Circle
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Member of the Inner Circle
Joined: Sep 2011
Posts: 14,748 Likes: 158 |
Could it be that the original cats fitted by the factory were pretty crap anyway?
Has anyone independently tested an original equipment AR sports cat during the three years before its MoT is due, I wonder? My sports-exhaust equiped Roadster has passed its MoTs, but 'only just' - thanks to an understanding tester. The answer to your question is: yes, they are pretty crap! Read http://www.talkmorgan.com/ubbthreads.php/topics/432639/a-tale-of-3-cats
Peter ![[Linked Image]](http://bradley.it/public_images/drive.jpg)
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