Main Menu
|
Nevada Classics
|
Advertise at CC
|
S |
M |
T |
W |
T |
F |
S |
|
|
|
1 |
2 |
3 |
4 |
5 |
6 |
7 |
8 |
9 |
10 |
11 |
12 |
13 |
14 |
15 |
16 |
17 |
18 |
19 |
20 |
21 |
22 |
23 |
24 |
25 |
26 |
27 |
28 |
29 |
30 |
31 |
|
|
CC Advertisers
|
|
03-26-2012, 04:56 PM
|
CC Member
|
|
|
Join Date: Mar 2011
Cobra Make, Engine:
Posts: 54
|
|
Not Ranked
What do I do about this?
Hopefully, this photo will load so you can see it. If not, I'll try again.
What you are looking at is a gap between the BBK header and the pipe going to the side exhaust. There is a gap just like this on the other side. I have a feeling the header and the side exhaust are as close as they are going to get without some major bending work. I think this is what is causing my backfiring when I let up off the gas. Anyone know what to do about this?
|
03-26-2012, 05:23 PM
|
|
CC Member
|
|
|
Join Date: Dec 2001
Location: Castalia,
Oh
Cobra Make, Engine: EM cobra, 450 inch sbc running a best ET of 9.14..so far..ALL MOTOR...approx 800 horse.............ERA with 482 FE..All Aluminum Engine
Posts: 1,395
|
|
Not Ranked
There should probably be a donut gasket in there....
__________________
Jack
XSSIVE .....
|
03-26-2012, 05:24 PM
|
|
Backdraft Racing Dealer
|
|
|
Join Date: Dec 2004
Location: North Haven,
CT
Cobra Make, Engine: Backdraft Racing
Posts: 5,122
|
|
Not Ranked
That's a ball and socket flange and is how it should fit...
|
03-26-2012, 05:55 PM
|
|
CC Member
|
|
|
Join Date: Mar 2006
Location: San Marcos california,
CA
Cobra Make, Engine: 1989 KCC from South Africa Right Hand Drive
Posts: 1,601
|
|
Not Ranked
You can loosen and clean the surfaces with a relatively fine paper or steel wool. You can also use exhaust sealed when you refit.
|
03-26-2012, 06:30 PM
|
CC Member
|
|
|
Join Date: Mar 2011
Cobra Make, Engine:
Posts: 54
|
|
Not Ranked
So, what you all are saying is, I have no problem. But there is 3/4", or more, gap between the header pipe and the side exhaust tube. There are bolts there that could be tightened, but I really think the builder did all the torquing down that he could. If I do need a gasket, what kind??
Thanks for the input, guys.
|
03-26-2012, 07:09 PM
|
|
Backdraft Racing Dealer
|
|
|
Join Date: Dec 2004
Location: North Haven,
CT
Cobra Make, Engine: Backdraft Racing
Posts: 5,122
|
|
Not Ranked
Check the photo here, if it does not clear it up for you, may want to find a shop... Flowmaster 15930 Header Collector Ball Flanges 3 in.
|
03-26-2012, 07:47 PM
|
CC Member
|
|
|
Join Date: May 2003
Location: Hudson Valley NY,
NY
Cobra Make, Engine: Backdraft, 302, Tremec 3550. #038
Posts: 863
|
|
Not Ranked
Quote:
Originally Posted by chomama1
Hopefully, this photo will load so you can see it. If not, I'll try again.
What you are looking at is a gap between the BBK header and the pipe going to the side exhaust. There is a gap just like this on the other side. I have a feeling the header and the side exhaust are as close as they are going to get without some major bending work. I think this is what is causing my backfiring when I let up off the gas. Anyone know what to do about this?
|
How long have you been driving it like this? A 3/4" gap all the way around on both sides is pretty close to running open headers and the sound would be pretty loud not to mention the mess inside the engine compartment. Are you sure its that big of a gap? Or are you saying that there is 3/4" between the flanges?
__________________
Kids in the backseats cause accidents, accidents in the backseat causes kids ! Good reason to get a Cobra !!!
|
03-26-2012, 09:13 PM
|
|
Senior Club Cobra Member
|
|
|
Join Date: Jan 2001
Location: Santa Barbara, Ca.,
ca
Cobra Make, Engine: R.U.C.C. with a 427FE, toploader
Posts: 1,435
|
|
Not Ranked
Might be missing something, but I don't see the gap?
__________________
Mike Z
Nothing sucks more than that moment during an argument when you realize you’re wrong.
|
03-26-2012, 09:41 PM
|
CC Member
|
|
|
Join Date: Jul 2002
Location: The Woodlands,
TX
Cobra Make, Engine: FFR Roadster
Posts: 42
|
|
Not Ranked
As Cashburn stated...that gap you're seeing is normal...It is designed that way. There is no opening there...it's just space between the flanges...the exhaust is sealed. My car looks exactly the same.
Rob
__________________
GOD IS MY COBRAPILOT!!!
Last edited by rokfor; 03-26-2012 at 09:43 PM..
|
03-26-2012, 09:52 PM
|
CC Member
|
|
|
Join Date: Nov 2000
Location: Flower Mound, TX,
tx
Cobra Make, Engine: Lonestar LS 427, Keith Craft 501,Toploader
Posts: 883
|
|
Not Ranked
Hey chomama, Rob is correct, everything is done correctly and there is a donut gasket inside there. If it were leaking, there would black soot everywhere. Your car's fine.
__________________
" It ain't no big deal"
|
03-26-2012, 09:54 PM
|
|
CC Member
|
|
|
Join Date: Sep 2009
Location: Camarillo,
CA
Cobra Make, Engine: SPF #2608, Roush 427SR T-W
Posts: 911
|
|
Not Ranked
Since there is a backfire I expect you are on the right track and need to tighten up the flange evenly or add something to seal it up better.
|
03-26-2012, 10:53 PM
|
|
CC Member
|
|
|
Join Date: Apr 2004
Location: Scotts Valley,
CA
Cobra Make, Engine: ERA 289 FIA #2108
Posts: 1,882
|
|
Not Ranked
Clue me in, guys. Why would an exhaust leak cause a backfiring problem? I'd be looking at the timing...
Exhaust leaks in and of themselves would bug me, just for messing up the sound of the Cobra.
DD
__________________
Dangerous Doug
"You're kidding, right?"
|
03-27-2012, 07:38 AM
|
Senior Club Cobra Member
|
|
|
Join Date: Jul 2000
Location: Las Vegas,
NV
Cobra Make, Engine: ERA 427 SO
Posts: 1,126
|
|
Not Ranked
With an exhaust leak, under some conditions (trailing throttle) fresh outside air can be pulled in through the leak, causing "afterburning" in the downstream exhaust from unburned fuel, resulting in backfiring or popping out the exhaust.
__________________
Ken
|
03-30-2012, 06:00 PM
|
CC Member
|
|
|
Join Date: Mar 2011
Cobra Make, Engine:
Posts: 54
|
|
Not Ranked
I am going to take another look at this. Since I have no "soot" in the engine compartment and it doesn't sound like open headers. This may be a false alarm. THanks to all.
|
03-31-2012, 05:58 PM
|
|
CC Member
|
|
|
Join Date: May 2001
Posts: 1,330
|
|
Not Ranked
I'd be checking timing. That joint looks fine. If you had an exhaust leak, you would most likely be hearing some sort of ticking and you'd see soot as previously mentioned. What running gear do you have? EFI, carb?
|
Posting Rules
|
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts
HTML code is Off
|
|
|
All times are GMT -7. The time now is 09:43 AM.
Links monetized by VigLink
|