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Kirkham Motorsports

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Old 03-26-2012, 04:56 PM
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Default 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?
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Old 03-26-2012, 05:23 PM
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There should probably be a donut gasket in there....
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Old 03-26-2012, 05:24 PM
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That's a ball and socket flange and is how it should fit...
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Old 03-26-2012, 05:55 PM
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You can loosen and clean the surfaces with a relatively fine paper or steel wool. You can also use exhaust sealed when you refit.
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Old 03-26-2012, 06:30 PM
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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.
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Old 03-26-2012, 07:09 PM
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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.
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Old 03-26-2012, 07:47 PM
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Quote:
Originally Posted by chomama1 View Post


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?
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Old 03-26-2012, 09:13 PM
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Might be missing something, but I don't see the gap?
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Old 03-26-2012, 09:41 PM
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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
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Old 03-26-2012, 09:52 PM
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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.
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Old 03-26-2012, 09:54 PM
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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.
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Old 03-26-2012, 10:53 PM
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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.

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Old 03-27-2012, 07:38 AM
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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.
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Old 03-30-2012, 06:00 PM
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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.
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Old 03-31-2012, 05:58 PM
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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?
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