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Exhaust fumes 1968 +4 DHC #578652
29/05/19 05:00 AM
29/05/19 05:00 AM
Joined: Jan 2019
Posts: 8
L
Lindsay B Offline OP
New to Talk Morgan
Lindsay B  Offline OP
New to Talk Morgan
L

Joined: Jan 2019
Posts: 8
Hi,
my friend commented recently, after a drive with the top down, in my 1968 +4 DHC, that exhaust fumes were very evident in the car at low speeds, and he thought we were being gassed.
The exhaust is a standard Plus 4 type with muffler, and the tailpipe exits at the rear of the car, just past the bumper bar level. The exhaust fumes are being sucked or swirled back in at the rear, as there are no leaks forward of the firewall.
Have any members noticed this in their cars, or can suggest any solution, other than driving faster.
Regards,
Lindsay.

Re: Exhaust fumes 1968 +4 DHC [Re: Lindsay B] #578654
29/05/19 05:41 AM
29/05/19 05:41 AM
Joined: Oct 2014
Posts: 3,688
Austria, Vienna area
The Austrian Offline
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The Austrian  Offline
Talk Morgan Addict

Joined: Oct 2014
Posts: 3,688
Austria, Vienna area
Replace windshield with aero screens! That should do the trick. oops

Most Morganians have survived these fumes so far.
Perhaps your carburetor or ignition settings are not perfect, so your engine produces more exhaust fumes due to inefficient fuel combustion?


Hannes
once: Green M3W; 2013
now: Red 4/4 Sport; 2011
and some practical cars for use in real life
Re: Exhaust fumes 1968 +4 DHC [Re: Lindsay B] #578658
29/05/19 06:36 AM
29/05/19 06:36 AM
Joined: Aug 2008
Posts: 2,085
Powick
tmg513 Offline
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tmg513  Offline
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Joined: Aug 2008
Posts: 2,085
Powick
I can't say I've ever heard of that. Do you notice it yourself? Is the exhaust on your side or the passenger side?


1972 4/4 2 Seater
Re: Exhaust fumes 1968 +4 DHC [Re: Lindsay B] #578659
29/05/19 06:38 AM
29/05/19 06:38 AM
Joined: Sep 2014
Posts: 1,731
YORK
KEVFITZ Offline
Talk Morgan Enthusiast
KEVFITZ  Offline
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Joined: Sep 2014
Posts: 1,731
YORK
Aeroscreens would do it for sure !!! ….

but on my +4 Supersports I found I was being gassed at low speeds before the cat got hot and the cockpit filled up with hydro carbons
with the roof down.

The 100% effective cure was to fit a side exit tail pipe made up in stainless by local firm for £75..problem solved !!!


" I LOVE THE SOUND OF THROTTLE BODIES IN THE MORNING " (ROBERT DUVAL IN "APOCOLYPSE NOW " )
Re: Exhaust fumes 1968 +4 DHC [Re: Lindsay B] #578662
29/05/19 06:59 AM
29/05/19 06:59 AM
Joined: Jul 2014
Posts: 486
Cornwall
griffo Offline
Learner Plates Off!
griffo  Offline
Learner Plates Off!

Joined: Jul 2014
Posts: 486
Cornwall
Rather than changing the windshield you might try a far less drastic solution which worked for me:

Just extend the tailpipe by a few inches. You will have to experiment but try to make it about four inches longer so the exhaust gas exits a little further behind the car in the air flow rather than being drawn back in.

Re: Exhaust fumes 1968 +4 DHC [Re: Lindsay B] #578672
29/05/19 07:30 AM
29/05/19 07:30 AM
Joined: May 2011
Posts: 985
Seamill, Ayrshire
M
Max5 Offline
Talk Morgan Regular
Max5  Offline
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M

Joined: May 2011
Posts: 985
Seamill, Ayrshire
I had this problem on a Booklands Roadster and a cheap local mod. to side exits on the exhaust saved the problem permanently.

Re: Exhaust fumes 1968 +4 DHC [Re: Lindsay B] #578677
29/05/19 07:44 AM
29/05/19 07:44 AM
Joined: Jul 2012
Posts: 1,453
Purton, nr Swindon UK
R
rainbowj Offline
Has a lot to Say!
rainbowj  Offline
Has a lot to Say!
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Joined: Jul 2012
Posts: 1,453
Purton, nr Swindon UK
I get fumes in my '92 plus4, especially with the side screens on. I need a new exhaust and was looking at Librands. They have a choice of different terminations. Will this help.


John
1992 plus4 connaught green
Re: Exhaust fumes 1968 +4 DHC [Re: Lindsay B] #578686
29/05/19 08:41 AM
29/05/19 08:41 AM
Joined: Jul 2014
Posts: 486
Cornwall
griffo Offline
Learner Plates Off!
griffo  Offline
Learner Plates Off!

Joined: Jul 2014
Posts: 486
Cornwall
John,
I don't believe different styles of tail trim are the issue. It seems to me that if the pipe exits right under the bumper (as my 2014 Plus 4 did) the fumes can, particularly with sidescreens on, be sucked forward by the vortex. Just try a slightly extended tailpipe. For me it completely cured the fumes issue.

Re: Exhaust fumes 1968 +4 DHC [Re: Lindsay B] #578698
29/05/19 10:44 AM
29/05/19 10:44 AM
Joined: Jan 2019
Posts: 8
L
Lindsay B Offline OP
New to Talk Morgan
Lindsay B  Offline OP
New to Talk Morgan
L

Joined: Jan 2019
Posts: 8
Thank you all for your suggestions, I think I will try the side exhaust pipe method.
Regards,
Lindsay.

Re: Exhaust fumes 1968 +4 DHC [Re: Lindsay B] #578708
29/05/19 11:39 AM
29/05/19 11:39 AM
Joined: Oct 2012
Posts: 164
Somerset
R
RJW Offline
L - Learner Plates On
RJW  Offline
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R

Joined: Oct 2012
Posts: 164
Somerset
I also get fumes on start up in my 2013 Plus 4. This problem is helped by
keeping both the side screen windows open by about one inch with the hood down. Once the engine has warmed up, the fumes are less noticeable.
Bob.

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