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Jun 14th, 2026
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Joined: May 2011
Posts: 1,444 Likes: 9
Has a lot to Say!
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Has a lot to Say!
Joined: May 2011
Posts: 1,444 Likes: 9 |
I would really like to know how you found the Sports Exhaust System on your Plus 4. I am contemplating this as I love the burble of a sports exhaust - but my dealer says it can get quite tiring on a long journey. Perhaps it is because we are also bike riders but we found it very pleasant and not at all tiring. If you drive sedately it is a low burble but if you stamp on the gas it produces a bit of a howl. I like it. On ours there is a little internal vibration or ringing in the pipe under hard acceleration at higher revs. I will see if we can get this resolved. It may not apply to all of them. It also pops a little on the over-run but a lot of people like that. Essentially it is the same as used on the Plus 4 SS. Perhaps an SS owner could comment too. At motorway speeds conversation is no problem but you can not hear the radio. We found it reasonably comfortable with the side screens up. I suspect it would be hard to hear the radio more because of wind and road noise than the exhaust noise. Thanks. It sounds like it might be an option, after all. I think the best thing would be for me to try and take one fitted with the sports exhaust for a test drive.
David
2020 Roadster 3.7 Dove Grey.
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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 |
Essentially it is the same as used on the Plus 4 SS. Perhaps an SS owner could comment too. Hi Peter, good to know you are back and happy with your trip and your car! Your manifold looks about the same as my one. But there could be a difference in sound generation as the Plus4SS also has the single throttle bodies. I had the experience with significant buzz sound in push operation. After some research my garage learned that the reason is the manifold´s design and structure itself (which is otherwise a piece of art). One solution is to damp the manifold. Therefore I have let wrapped the manifold with heat insulating tape, similar to this one: http://www.thermotec.com/products/11001-exhaust-insulating-header-wrap.htmlThe result is a clear reduce of buzz in push operation - and - as a free gift - a significant increase of torque and power in the mid rev band. The colour of the sound is a little bit reduced but you became familiar with it very soon. The car sounds more "dry" but the performance win is astonishing. Later on I learned that a manifold wrap is common with racing cars. The effect of more performance is caused by keeping the air in the manifold hotter. Therefore the whole air flow works with lower resistance. Air speed in the exhaust rises up and accordingly the intake can suck more oxygen as well. Imagine how huge our manifolds are...they work as a cooler which should not be so.  
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Joined: Feb 2011
Posts: 14,009
Member of the Inner Circle
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Member of the Inner Circle
Joined: Feb 2011
Posts: 14,009 |
And of course...there is the consideration of the sump  Oh yes. The SUMP, heard/felt mine grounding this morning, on the lane where I live there are three and one of them must be a fraction higher........  Ah yes...your speed bumps.......I sailed over them without any problem! 
Jays
Former Morgan owner. Gone but hopefully not forgotten!
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Joined: Sep 2011
Posts: 14,748 Likes: 158
Member of the Inner Circle
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OP
Member of the Inner Circle
Joined: Sep 2011
Posts: 14,748 Likes: 158 |
Heinz, do you mean by "significant buzz sound in push operation" that you were getting a sort of metallic vibration at higher revs under acceleration? If so we are also experiencing that and I thought maybe a clamp was a little loose.
The manifold wrap is as ugly as sin but if it solves that problem and also makes the system more efficient I will consider adopting it too.
Peter ![[Linked Image]](http://bradley.it/public_images/drive.jpg)
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Joined: Feb 2011
Posts: 14,009
Member of the Inner Circle
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Member of the Inner Circle
Joined: Feb 2011
Posts: 14,009 |
Peter...it may be worth easing off the clamps and retightening them. It works on my system!
Jays
Former Morgan owner. Gone but hopefully not forgotten!
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Joined: Sep 2011
Posts: 14,748 Likes: 158
Member of the Inner Circle
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OP
Member of the Inner Circle
Joined: Sep 2011
Posts: 14,748 Likes: 158 |
Thanks Jay.
The car is going in for its first service on Tuesday. I will ask them to have a look at it.
Peter
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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 |
Not when accelerating, the opposite. When driving without throttle the buzz sound appeared. Any other Plus 4 SS experiences about this issue? I talked to Günter who shares the same experience. Yes I´m aware that on an aesthetically level the pure manifold looks much better. But the increase of torque plus the suppression of buzz justifies the wrap around. It´s an issue between 3K and 4K revs.
'14 4/4 graphite grey
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