2 piece manifold swap does not work - Page 2 - JeepForum.com
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post #16 of 36 Old 05-17-2015, 12:51 AM
willis36
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Looks like a lot of work. Why not just buy a replacement manifold with the flex joints for less than a hundred bucks and be done with it?

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post #17 of 36 Old 05-17-2015, 01:09 AM
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Originally Posted by willis36 View Post
Looks like a lot of work. Why not just buy a replacement manifold with the flex joints for less than a hundred bucks and be done with it?
Because quite possibly you wont be done with it, those crack also.

The least likely exhaust manifold to crack is the 2000+ OEM one for the 4.0L engine...

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post #18 of 36 Old 05-17-2015, 09:18 AM
ravenworks
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Get a copper gasket made,they're out there.

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post #19 of 36 Old 05-17-2015, 10:19 AM Thread Starter
BamaJeepman21
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On the research I've done the last couple days, APN makes the thickest 1 piece manifold at 1 1/2" thick tubing and I still found cases of those cracking.

-Jack
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post #20 of 36 Old 05-17-2015, 06:42 PM
Robert J. yates
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I had my factory TSB replacement flex header ceramic coated 10 years ago and it's just fine. My take was the coating would keep the header from becoming brittle and crack.

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post #21 of 36 Old 05-17-2015, 07:03 PM Thread Starter
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I had my factory TSB replacement flex header ceramic coated 10 years ago and it's just fine. My take was the coating would keep the header from becoming brittle and crack.
I wish I had read more of this before I tried this swap and changed my Y pipe. No going back now unless I want to spend more money I don't have

-Jack
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post #22 of 36 Old 05-18-2015, 08:39 AM
JWebber
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I've been running the flex bellow type exhaust for many many years and had no problems.
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post #23 of 36 Old 05-18-2015, 12:25 PM Thread Starter
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Here's what I'm talking about. I found out there was a metal one on there in the first place. This is a Felpro 93094 metal/rubber gasket. It's leaked on all exhaust ports.




At this point in time I'm really considering going back to the 1 piece manifold if the Y pipe isn't too expensive. My other alternative is to get a '98 copper gasket, seal that one to the Felpro, put high temp RTV on the head, gaskets, and manifold, and then hope for the best. I tried to get pictures of the manifold on the head to show the gaps but I couldn't.

-Jack
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post #24 of 36 Old 05-18-2015, 02:25 PM Thread Starter
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Going back to the 1 piece manifold. Ordered a Ebay ceramic coated header and new Walker front pipe. Total was $170. They'll be in hopefully by the end of the week. I'm taking Yates advice and hoping the ceramic coating prevents it from cracking.

-Jack
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post #25 of 36 Old 05-18-2015, 04:27 PM
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I hate to tell you, but that header you linked does not have the flex joints and will crack as well. Something like this would be better.

http://www.amazon.com/APDTY-Exhaust-...haust+manifold
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post #26 of 36 Old 05-19-2015, 01:04 AM Thread Starter
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I hate to tell you, but that header you linked does not have the flex joints and will crack as well. Something like this would be better.

http://www.amazon.com/APDTY-Exhaust-...haust+manifold
I trust the ceramic coating more than the flex joints. Hopefully it'll keep it cool enough to avoid cracking. If it does crack, then I'll just buy the flex joint one and pay the $$ to get it ceramic coated. I searched everywhere for a coated flex joint header but couldn't find one.

-Jack
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post #27 of 36 Old 05-27-2015, 04:30 PM Thread Starter
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Well got it all bolted up and it works perfect. Still a small tick but I'm going to assume that's the lifters. Also the ceramic coating burned off so it's only a matter of time until this one cracks. But until then, I'm finally happy it's fixed.

-Jack
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post #28 of 36 Old 05-27-2015, 04:49 PM
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Take a look at the Banks Revolver header. There has only been one instance of cracking that I have found, and that was due to the guy not having any exhaust hangers throughout his exhaust.

So far I have a couple thousand miles on mine.

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post #29 of 36 Old 05-27-2015, 07:28 PM Thread Starter
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Take a look at the Banks Revolver header. There has only been one instance of cracking that I have found, and that was due to the guy not having any exhaust hangers throughout his exhaust.

So far I have a couple thousand miles on mine.
Woah $450. I'd rather get a flex joint one and get a real ceramic coating for it.

So the Jeep sounds much better but I still have a decently loud tick under load. It's there at idle and when I accelerate but not when I rev the engine. Is this more likely a lifter tick than the gasket didn't seat right or something?

-Jack
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post #30 of 36 Old 05-27-2015, 10:05 PM
Robert J. yates
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Originally Posted by BamaJeepman21 View Post
Well got it all bolted up and it works perfect. Still a small tick but I'm going to assume that's the lifters. Also the ceramic coating burned off so it's only a matter of time until this one cracks. But until then, I'm finally happy it's fixed.
Take a flex joint header to a specialty coatings shop. I use Embee Performance in Tustin. They even have coatings for pistons. My header has been coated for years and while a bit more dull than when first coated, it hasn't burned off. Prep is everything.

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