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 16Likes
10-08-2012, 08:46 PM
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CC Member
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Join Date: Sep 2012
Location: Los Alamitos,
CA
Cobra Make, Engine: Ford 392 Cobra engine
Posts: 3
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Not Ranked
AC Cobra exhaust noise and fumes
Hello,
I have had a Ford 392 AC Cobra.
I am discovering that I have some pretty strong fumes at idle.
Additionally, I want to quiet the car down as much as possible which was always the plan when I bought it.
Any suggestions and anybody install catalic converters.
Jimmy
562.879.2298
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10-09-2012, 05:59 AM
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CC Member
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Join Date: Oct 2003
Posts: 4,078
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Not Ranked
You've got this all wrong Jimmy. Sell the car and buy a Miata. Cat converters is what forced many of us to buy / build Cobras.
Seriously-that comes with the territory with Cobras-you've made a poor choice if those are your priorities..
__________________
Chas.
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10-09-2012, 06:18 AM
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CC Member
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Join Date: Jan 2008
Location: Williamsport,
PA
Cobra Make, Engine: Kellison Stallion 468 FE
Posts: 2,703
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Not Ranked
Quote:
Originally Posted by mnjts@aol.com
Hello,
I have had a Ford 392 AC Cobra.
I am discovering that I have some pretty strong fumes at idle.
Additionally, I want to quiet the car down as much as possible which was always the plan when I bought it.
Any suggestions and anybody install catalic converters.
Jimmy
562.879.2298
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i think i just vomited in my mouth a little....
chances are the cats will make the car not even idle from the restriction.
__________________
Fred B
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10-09-2012, 07:16 AM
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CC Member
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Join Date: Jan 2005
Location: Rancho Cucamonga,
ca
Cobra Make, Engine: SPF 239
Posts: 820
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Not Ranked
Jimmy,
A rich idle is easily fixed with a little tuning. I would take the car to Randy Ritchey at Performance Associates in San Dimas. He is one of the best carb guys in California.
Performance Associates
As far as the catalytic converter comment.
Dude!! Your killin me! Cut it out..
Get some ear plugs and call it a day.
Jason
Last edited by D-CEL; 10-09-2012 at 07:22 AM..
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10-09-2012, 06:42 AM
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CC Member
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Join Date: Jun 2002
Location: Canton,
GA.
Cobra Make, Engine: E.R.A. #505
Posts: 216
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Not Ranked
If you install some 90* bends on the sidepipes, you can turn them into stacks. That should reduce some of the fumes that you are experiencing.
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10-09-2012, 06:48 AM
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CC Member
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Join Date: Sep 2010
Location: Northfield,
MN
Cobra Make, Engine: B&B, FR302
Posts: 218
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Not Ranked
Use racing fuel; instead of trying to get rid of the fumes you will become addicted!
__________________
There are two kinds of people - those smart enough to know they don’t know, and those dumb enough to insist they do
Last edited by NFLDMNBB; 10-09-2012 at 07:00 AM..
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10-09-2012, 06:52 AM
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CC Member
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Join Date: Jan 2008
Location: Williamsport,
PA
Cobra Make, Engine: Kellison Stallion 468 FE
Posts: 2,703
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Not Ranked
Cobra Fumes Kit
these are both functional and stylish.....
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Fred B
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10-09-2012, 07:55 AM
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CC Member
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Join Date: May 2011
Location: Orlando,
FL
Cobra Make, Engine: ERA154 427 HR
Posts: 206
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Not Ranked
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10-09-2012, 07:58 AM
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CC Member
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Join Date: Jan 2005
Location: Rancho Cucamonga,
ca
Cobra Make, Engine: SPF 239
Posts: 820
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Not Ranked
LOL!!
I was trying to be nice...lol
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10-09-2012, 08:23 AM
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CC Member
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Join Date: Feb 2001
Location: Lakewood,
CO
Cobra Make, Engine: Midstates, 460
Posts: 327
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Neutral
There are muffler inserts that you may be able to install, Car Chemistry 3DI03R - Car Chemistry Exhaust Inserts - Overview - SummitRacing.com and if your turnouts are removable you may be able to redirect the exhaust to exit under the car, or at least down which may make the noise more tolerable. I have never tried either solution so these are just ideas, your results may vary...
__________________
"Clowns to the left of me,
Jokers to the right..."
Brandon
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10-09-2012, 08:36 AM
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CC Member
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Join Date: May 2012
Cobra Make, Engine:
Posts: 57
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Not Ranked
The problem is most Cobra replicars emulate the S/C 427 layout with sidepipes. Most Shelby's sold were undercar exhaust, and there is a reason for that.
Sidepipes are loud and smelly, it's no problem racing. Idling thru Taco Bell, yes. Most cars on the road are built with undercar exhaust with tips out back where the aerodynamics won't suck it back over the trunk into your face.
Side exhaust, not so much. It's right there in your ears, and the fumes at your elbow, literally. But the Manly Men crowd thinks that's cool, and builds them that way. No reason they should look to reality or the fact very few original Cobra buyers wanted that. In fact, the loud smelly sidepipes were part of the problem, it took two years to sell the last 427, and Shelby closed it's doors after that.
As a daily driver, sidepipes don't cut it. And the guys jerking you around on this thread agree, too, just look at their stable of cars they and their family drive to work. The Cobra in the garage is the exception.
Undercar exhaust was the answer then, and still is. Ignore the chest thumping and take a long look at the originals at a show near you. It cleans up the boy toy wannabe racer look and turns it into a mature man's car. You don't have to suffer, neither do your passengers, and it goes just as fast on city streets.
There's plenty of ways to do it, this one handles a lot of issues well: Under Car Exhaust - Part 1 |
10-09-2012, 08:54 AM
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CC Member
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Join Date: Oct 2010
Cobra Make, Engine: Superformance
Posts: 663
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Not Ranked
Quote:
Originally Posted by tirod
Sidepipes are loud and smelly, it's no problem racing. Idling thru Taco Bell, yes. Most cars on the road are built with undercar exhaust with tips out back where the aerodynamics won't suck it back over the trunk into your face.
Side exhaust, not so much. It's right there in your ears, and the fumes at your elbow, literally. But the Manly Men crowd thinks that's cool, and builds them that way. No reason they should look to reality or the fact very few original Cobra buyers wanted that. In fact, the loud smelly sidepipes were part of the problem, it took two years to sell the last 427, and Shelby closed it's doors after that.
As a daily driver, sidepipes don't cut it. And the guys jerking you around on this thread agree, too, just look at their stable of cars they and their family drive to work. The Cobra in the garage is the exception.
Undercar exhaust was the answer then, and still is. Ignore the chest thumping and take a long look at the originals at a show near you. It cleans up the boy toy wannabe racer look and turns it into a mature man's car. You don't have to suffer, neither do your passengers, and it goes just as fast on city streets.
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There's an insult to virtually every member of CC in here somewhere.  |
10-09-2012, 11:28 AM
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CC Member
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Join Date: Oct 2006
Location: Huntsville,
AL
Cobra Make, Engine: SOLD-SPO2660, Southern Automotive 406FE, TKO-600
Posts: 65
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Not Ranked
Man, I thought this must be a late April fools joke. If it isn't, it is clearly Miata time!
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Joe
Have fun and enjoy life, because when it is over, it is too late!
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10-09-2012, 11:38 AM
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Full Blown Member
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Join Date: Sep 2008
Cobra Make, Engine: KMP 427 S/C, Twin Paxton 511 FE
Posts: 2,594
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Not Ranked
Quote:
Originally Posted by tirod
...and turns it into a mature man's car.
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God, please, no! 
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rodneym
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10-09-2012, 03:05 PM
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CC Member
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Join Date: Oct 2003
Posts: 4,078
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Not Ranked
Quote:
Originally Posted by rodneym
God, please, no! |
Spoken like a man barely satisfied by 700+ HP...
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Chas.
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10-09-2012, 08:13 PM
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CC Member
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Join Date: Aug 2009
Location: Adelaide,
SA
Cobra Make, Engine: AP 289FIA 'English' spec.
Posts: 13,143
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Not Ranked
Somebody said to me once that a stupid question is the one that you DON'T ask. Here's a new guy who's asking a question, and what are we trying to do.....convince him not to ever ask again? 
Take it easy on the ridicule, huh? 
Cheers,
Glen |
10-10-2012, 03:48 AM
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CC Member
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Join Date: Dec 2011
Location: York Co. Maine USA,
ME
Cobra Make, Engine: ERA 427 S/C W/Holmon Moody Original Nascar build #508 Iron Block/heads (C5AE-H) Bal/Blu 427 Sideoiler; 780 Holley Dbl. Pump; 4 Speed Top Loader; AP Racing Bks; IRS; 15" Trigo pins
Posts: 391
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Not Ranked
OMG!! Get a foo!foo! Miata, MG, Fiat, etc. car!!! Put flames on the side  That will fix your sport car cravings  You clearly don't belong in a AC! Even a street version! Or at least spend the cash to install undercar exhaust, and do a little re-tuning.
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03-03-2016, 06:05 AM
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CC Member
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Join Date: Sep 2001
Cobra Make, Engine:
Posts: 672
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Not Ranked
Quote:
Originally Posted by tirod
The problem is most Cobra replicars emulate the SMost Shelby's sold were undercar exhaust, and there is a reason for that. No reason they should look to reality or the fact very few original Cobra buyers wanted that. In fact, the loud smelly sidepipes were part of the problem.
As a daily driver, sidepipes don't cut it. And the guys jerking you around on this thread agree, too, just look at their stable of cars they and their family drive to work. The Cobra in the garage is the exception.
Undercar exhaust was the answer then, and still is. Ignore the chest thumping and take a long look at the originals at a show near you. It cleans up the boy toy wannabe racer look and turns it into a mature man's car. You don't have to suffer, neither do your passengers, and it goes just as fast on city streets.
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Really ???  remember... Guys drove them an modified them !!!! First thing I did was the side exhaust. Then the roll bar.... Wide racing tires. List went on an on. Best thing the OP can do is get it tuned..
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Dan
427 CSX 3000/4000 and Shelbys.
All gone ! Was a Hell of a run 
Now ... The dogs car
Mercedes E63S station wagon. 603hp
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10-09-2012, 08:51 AM
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CC Member
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Join Date: Oct 2011
Location: Wake Forest,
N.C
Cobra Make, Engine: BDR #648 351w/385hp
Posts: 61
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Not Ranked
As ERA Chase said, sell the car and buy a Miata.
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10-09-2012, 12:48 PM
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CC Member
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Join Date: May 2001
Location: California,
Ca
Cobra Make, Engine: NAF 289 Slabside Early Comp Car with 289 Webers and all the goodies. Cancelling the efforts of several Priuses
Posts: 6,592
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Not Ranked
Your jetting may be overly rich resulting in high unburnt hydrocarbons, it'll really burn your eyes.
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Rick
As you slide down the Banister of Life, may the splinters never be pointing the wrong way
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