Earle Horton wrote:
> "DougW" wrote ...
>> ufatbastehd wrote:
>>> On Nov 28, 6:36 pm, "J. Clarke" wrote:
>>>> DougW wrote:
>>>>> testert555 wrote:
>>>>>> Can anyone recommend a catalytic converter for my 91 YJ? There is
>>>>>> a huge difference is prices. I'm going to put it in myself and
>>>>>> cannot weld. Cheaper the better.
>>>>
>>>>> Get it welded in. (in some states the cat must be welded on the
>>>>> engine side, has to do with emissions laws)
>>>>
>>>>> A good local muffler shop should be able to do the job for $100 or
>>>>> so.
>>>>
>>>> In what states does it have to be welded? Or is this more
>>>> California craziness?
>>
>> Could be. I checked the Oklahoma regs and they don't specify.
>> Thought the local muffler shop told me that when I was thinking
>> of swapping to a bolt-in unit.
>
> Muffler shoppes will tell you anything, especially if they get to weld
> the new unit in.

True, but to weld on the bolt adapter would have been more money for the
shop.

>>
>>> I got my cat from http://www.quadratec.com
>>>
>>> its clamped on and I passed inspection in NY
>>
>> The only problem I have with clamps is on many installs the
>> pipe tends to rotate. A spot weld is usually all it takes
>> to keep things in place.
>>
> If it is stubborn enough to need a spot weld, usually there is another
> problem, such as mismatched pipe, a joint not inserted all the way or
> a clamp the wrong size. The stainless steel exhaust components are
> pretty slippery, but if you run the engine, retighten the clamps and
> repeat usually even they will lock down eventually. I have one that
> I am giving up on and will spot weld later today.

My problems always pop up when the exhaust hangers put torque on the
pipe. In the ZJ they are all off to one side so the whole assembly
tries to rotate.

--
DougW

 

On Nov 29, 5:39 pm, "DougW" <I.only.read.use...@invalid.address>
wrote:
> Earle Horton wrote:
> > "DougW" wrote ...
> >> ufatbastehd wrote:
> >>> On Nov 28, 6:36 pm, "J. Clarke" wrote:
> >>>> DougW wrote:
> >>>>> testert555 wrote:
> >>>>>> Can anyone recommend a catalytic converter for my 91 YJ? There is
> >>>>>> a huge difference is prices. I'm going to put it in myself and
> >>>>>> cannot weld. Cheaper the better.
>
> >>>>> Get it welded in. (in some states the cat must be welded on the
> >>>>> engine side, has to do with emissions laws)
>
> >>>>> A good local muffler shop should be able to do the job for $100 or
> >>>>> so.
>
> >>>> In what states does it have to be welded? Or is this more
> >>>> California craziness?
>
> >> Could be. I checked the Oklahoma regs and they don't specify.
> >> Thought the local muffler shop told me that when I was thinking
> >> of swapping to a bolt-in unit.
>
> > Muffler shoppes will tell you anything, especially if they get to weld
> > the new unit in.
>
> True, but to weld on the bolt adapter would have been more money for the
> shop.
>
>
>
> >>> I got my cat fromhttp://www.quadratec.com
>
> >>> its clamped on and I passed inspection in NY
>
> >> The only problem I have with clamps is on many installs the
> >> pipe tends to rotate. A spot weld is usually all it takes
> >> to keep things in place.
>
> > If it is stubborn enough to need a spot weld, usually there is another
> > problem, such as mismatched pipe, a joint not inserted all the way or
> > a clamp the wrong size. The stainless steel exhaust components are
> > pretty slippery, but if you run the engine, retighten the clamps and
> > repeat usually even they will lock down eventually. I have one that
> > I am giving up on and will spot weld later today.
>
> My problems always pop up when the exhaust hangers put torque on the
> pipe. In the ZJ they are all off to one side so the whole assembly
> tries to rotate.
>
> --
> DougW


Its been on since March I crawl under and check things out once in a
while and have not noticed anything yet. I used band type clamps. Not
sure if that would make a difference.
I'll keep an eye on mine.

 

On Nov 29, 5:39 pm, "DougW" <I.only.read.use...@invalid.address>
wrote:
> Earle Horton wrote:
> > "DougW" wrote ...
> >> ufatbastehd wrote:
> >>> On Nov 28, 6:36 pm, "J. Clarke" wrote:
> >>>> DougW wrote:
> >>>>> testert555 wrote:
> >>>>>> Can anyone recommend a catalytic converter for my 91 YJ? There is
> >>>>>> a huge difference is prices. I'm going to put it in myself and
> >>>>>> cannot weld. Cheaper the better.
>
> >>>>> Get it welded in. (in some states the cat must be welded on the
> >>>>> engine side, has to do with emissions laws)
>
> >>>>> A good local muffler shop should be able to do the job for $100 or
> >>>>> so.
>
> >>>> In what states does it have to be welded? Or is this more
> >>>> California craziness?
>
> >> Could be. I checked the Oklahoma regs and they don't specify.
> >> Thought the local muffler shop told me that when I was thinking
> >> of swapping to a bolt-in unit.
>
> > Muffler shoppes will tell you anything, especially if they get to weld
> > the new unit in.
>
> True, but to weld on the bolt adapter would have been more money for the
> shop.
>
>
>
> >>> I got my cat fromhttp://www.quadratec.com
>
> >>> its clamped on and I passed inspection in NY
>
> >> The only problem I have with clamps is on many installs the
> >> pipe tends to rotate. A spot weld is usually all it takes
> >> to keep things in place.
>
> > If it is stubborn enough to need a spot weld, usually there is another
> > problem, such as mismatched pipe, a joint not inserted all the way or
> > a clamp the wrong size. The stainless steel exhaust components are
> > pretty slippery, but if you run the engine, retighten the clamps and
> > repeat usually even they will lock down eventually. I have one that
> > I am giving up on and will spot weld later today.
>
> My problems always pop up when the exhaust hangers put torque on the
> pipe. In the ZJ they are all off to one side so the whole assembly
> tries to rotate.
>
> --
> DougW


Its been on since March I crawl under and check things out once in a
while and have not noticed anything yet. I used band type clamps. Not
sure if that would make a difference.
I'll keep an eye on mine.

 

"Earle Horton" <123456@nospam.com> wrote in message
news:474ed81a$0$26010$88260bb3@free.teranews.com.. .
> "DougW" <I.only.read.usenet@invalid.address> wrote in message
> news:S8B3j.29316$L15.24393@newsfe08.phx...
>> ufatbastehd wrote:
>> > On Nov 28, 6:36 pm, "J. Clarke" <jclarke.use...@***.net> wrote:
>> >> DougW wrote:
>> >>> testert555 wrote:
>> >>>> Can anyone recommend a catalytic converter for my 91 YJ? There is
>> >>>> a huge difference is prices. I'm going to put it in myself and
>> >>>> cannot weld. Cheaper the better.
>> >>
>> >>> Get it welded in. (in some states the cat must be welded on the
>> >>> engine side, has to do with emissions laws)
>> >>
>> >>> A good local muffler shop should be able to do the job for $100 or
>> >>> so.
>> >>
>> >> In what states does it have to be welded? Or is this more
>> >> California craziness?
>>
>> Could be. I checked the Oklahoma regs and they don't specify.
>> Thought the local muffler shop told me that when I was thinking
>> of swapping to a bolt-in unit.
>
> Muffler shoppes will tell you anything, especially if they get to weld
> the new unit in.
>
>>
>> > I got my cat from http://www.quadratec.com
>> >
>> > its clamped on and I passed inspection in NY
>>
>> The only problem I have with clamps is on many installs the
>> pipe tends to rotate. A spot weld is usually all it takes
>> to keep things in place.
>>
> If it is stubborn enough to need a spot weld, usually there is another
> problem, such as mismatched pipe, a joint not inserted all the way or a
> clamp the wrong size. The stainless steel exhaust components are pretty
> slippery, but if you run the engine, retighten the clamps and repeat
> usually even they will lock down eventually. I have one that I am
> giving up on and will spot weld later today.
>
> Cheers,
>
> Earle
>

I've had that problem. I used a muffler clamp to install the muffler and
cat and have been retighting the clamps but the buggers have still rotated
about 45 degrees on me. Gonna loosen the clamps and spot weld the buggers
in place and then retighten the clamps.

 

"Earle Horton" <123456@nospam.com> wrote in message
news:474ed81a$0$26010$88260bb3@free.teranews.com.. .
> "DougW" <I.only.read.usenet@invalid.address> wrote in message
> news:S8B3j.29316$L15.24393@newsfe08.phx...
>> ufatbastehd wrote:
>> > On Nov 28, 6:36 pm, "J. Clarke" <jclarke.use...@***.net> wrote:
>> >> DougW wrote:
>> >>> testert555 wrote:
>> >>>> Can anyone recommend a catalytic converter for my 91 YJ? There is
>> >>>> a huge difference is prices. I'm going to put it in myself and
>> >>>> cannot weld. Cheaper the better.
>> >>
>> >>> Get it welded in. (in some states the cat must be welded on the
>> >>> engine side, has to do with emissions laws)
>> >>
>> >>> A good local muffler shop should be able to do the job for $100 or
>> >>> so.
>> >>
>> >> In what states does it have to be welded? Or is this more
>> >> California craziness?
>>
>> Could be. I checked the Oklahoma regs and they don't specify.
>> Thought the local muffler shop told me that when I was thinking
>> of swapping to a bolt-in unit.
>
> Muffler shoppes will tell you anything, especially if they get to weld
> the new unit in.
>
>>
>> > I got my cat from http://www.quadratec.com
>> >
>> > its clamped on and I passed inspection in NY
>>
>> The only problem I have with clamps is on many installs the
>> pipe tends to rotate. A spot weld is usually all it takes
>> to keep things in place.
>>
> If it is stubborn enough to need a spot weld, usually there is another
> problem, such as mismatched pipe, a joint not inserted all the way or a
> clamp the wrong size. The stainless steel exhaust components are pretty
> slippery, but if you run the engine, retighten the clamps and repeat
> usually even they will lock down eventually. I have one that I am
> giving up on and will spot weld later today.
>
> Cheers,
>
> Earle
>

I've had that problem. I used a muffler clamp to install the muffler and
cat and have been retighting the clamps but the buggers have still rotated
about 45 degrees on me. Gonna loosen the clamps and spot weld the buggers
in place and then retighten the clamps.

 

DougW wrote:
> ufatbastehd wrote:
>> On Nov 28, 6:36 pm, "J. Clarke" <jclarke.use...@***.net> wrote:
>>> DougW wrote:
>>>> testert555 wrote:
>>>>> Can anyone recommend a catalytic converter for my 91 YJ? There is a
>>>>> huge difference is prices. I'm going to put it in myself and cannot
>>>>> weld. Cheaper the better.
>>>> Get it welded in. (in some states the cat must be welded on the
>>>> engine side, has to do with emissions laws)
>>>> A good local muffler shop should be able to do the job for $100 or
>>>> so.
>>> In what states does it have to be welded? Or is this more California
>>> craziness?
>
> Could be. I checked the Oklahoma regs and they don't specify. Thought
> the local muffler shop told me that when I was thinking of swapping to a
> bolt-in unit.
>
>> I got my cat from http://www.quadratec.com
>>
>> its clamped on and I passed inspection in NY
>
> The only problem I have with clamps is on many installs the
> pipe tends to rotate. A spot weld is usually all it takes
> to keep things in place.
>

Local specialty shops tend to know the regs pretty well and it is
usually not in their interest to overly lie if they have competitors.
There are some really good aftermarket cats available, although as
someone noted, some states ban universal fit styles more for political
than technical reasons.

Yeah, even the expensive Banks sleeve style clamps can be problems.
Somehow I kept managing to loosen and misalign the connect to my cat
back just enough to leak a bit until the service manager had a tech just
put a couple tack welds on it. The stainless was not a problem, and it
hasnt loosened in years...sadly that dealer is defunct and havent found
another good one in two different states yet.

 

DougW wrote:
> ufatbastehd wrote:
>> On Nov 28, 6:36 pm, "J. Clarke" <jclarke.use...@***.net> wrote:
>>> DougW wrote:
>>>> testert555 wrote:
>>>>> Can anyone recommend a catalytic converter for my 91 YJ? There is a
>>>>> huge difference is prices. I'm going to put it in myself and cannot
>>>>> weld. Cheaper the better.
>>>> Get it welded in. (in some states the cat must be welded on the
>>>> engine side, has to do with emissions laws)
>>>> A good local muffler shop should be able to do the job for $100 or
>>>> so.
>>> In what states does it have to be welded? Or is this more California
>>> craziness?
>
> Could be. I checked the Oklahoma regs and they don't specify. Thought
> the local muffler shop told me that when I was thinking of swapping to a
> bolt-in unit.
>
>> I got my cat from http://www.quadratec.com
>>
>> its clamped on and I passed inspection in NY
>
> The only problem I have with clamps is on many installs the
> pipe tends to rotate. A spot weld is usually all it takes
> to keep things in place.
>

Local specialty shops tend to know the regs pretty well and it is
usually not in their interest to overly lie if they have competitors.
There are some really good aftermarket cats available, although as
someone noted, some states ban universal fit styles more for political
than technical reasons.

Yeah, even the expensive Banks sleeve style clamps can be problems.
Somehow I kept managing to loosen and misalign the connect to my cat
back just enough to leak a bit until the service manager had a tech just
put a couple tack welds on it. The stainless was not a problem, and it
hasnt loosened in years...sadly that dealer is defunct and havent found
another good one in two different states yet.

 

DougW wrote:
> Earle Horton wrote:
>> "DougW" wrote ...
>>> ufatbastehd wrote:
>>>> On Nov 28, 6:36 pm, "J. Clarke" wrote:
>>>>> DougW wrote:
>>>>>> testert555 wrote:
>>>>>>> Can anyone recommend a catalytic converter for my 91 YJ? There is
>>>>>>> a huge difference is prices. I'm going to put it in myself and
>>>>>>> cannot weld. Cheaper the better.
>>>>>> Get it welded in. (in some states the cat must be welded on the
>>>>>> engine side, has to do with emissions laws)
>>>>>> A good local muffler shop should be able to do the job for $100 or
>>>>>> so.
>>>>> In what states does it have to be welded? Or is this more
>>>>> California craziness?
>>> Could be. I checked the Oklahoma regs and they don't specify.
>>> Thought the local muffler shop told me that when I was thinking
>>> of swapping to a bolt-in unit.
>> Muffler shoppes will tell you anything, especially if they get to weld
>> the new unit in.
>
> True, but to weld on the bolt adapter would have been more money for the
> shop.
>
>>>> I got my cat from http://www.quadratec.com
>>>>
>>>> its clamped on and I passed inspection in NY
>>> The only problem I have with clamps is on many installs the
>>> pipe tends to rotate. A spot weld is usually all it takes
>>> to keep things in place.
>>>
>> If it is stubborn enough to need a spot weld, usually there is another
>> problem, such as mismatched pipe, a joint not inserted all the way or
>> a clamp the wrong size. The stainless steel exhaust components are
>> pretty slippery, but if you run the engine, retighten the clamps and
>> repeat usually even they will lock down eventually. I have one that
>> I am giving up on and will spot weld later today.
>
> My problems always pop up when the exhaust hangers put torque on the
> pipe. In the ZJ they are all off to one side so the whole assembly
> tries to rotate.
>
Yeah, then those assembly notches have the murphys law of always
aligning to create a tiny leak.

Then that rear cheap rubber exhaust hanger gets 3 minutes old and tries
to droop your cat back until you get ticked off and create your own with
a bit of neoprene clamped inside the standard cheapass mopar rubber
hanger.

 

DougW wrote:
> Earle Horton wrote:
>> "DougW" wrote ...
>>> ufatbastehd wrote:
>>>> On Nov 28, 6:36 pm, "J. Clarke" wrote:
>>>>> DougW wrote:
>>>>>> testert555 wrote:
>>>>>>> Can anyone recommend a catalytic converter for my 91 YJ? There is
>>>>>>> a huge difference is prices. I'm going to put it in myself and
>>>>>>> cannot weld. Cheaper the better.
>>>>>> Get it welded in. (in some states the cat must be welded on the
>>>>>> engine side, has to do with emissions laws)
>>>>>> A good local muffler shop should be able to do the job for $100 or
>>>>>> so.
>>>>> In what states does it have to be welded? Or is this more
>>>>> California craziness?
>>> Could be. I checked the Oklahoma regs and they don't specify.
>>> Thought the local muffler shop told me that when I was thinking
>>> of swapping to a bolt-in unit.
>> Muffler shoppes will tell you anything, especially if they get to weld
>> the new unit in.
>
> True, but to weld on the bolt adapter would have been more money for the
> shop.
>
>>>> I got my cat from http://www.quadratec.com
>>>>
>>>> its clamped on and I passed inspection in NY
>>> The only problem I have with clamps is on many installs the
>>> pipe tends to rotate. A spot weld is usually all it takes
>>> to keep things in place.
>>>
>> If it is stubborn enough to need a spot weld, usually there is another
>> problem, such as mismatched pipe, a joint not inserted all the way or
>> a clamp the wrong size. The stainless steel exhaust components are
>> pretty slippery, but if you run the engine, retighten the clamps and
>> repeat usually even they will lock down eventually. I have one that
>> I am giving up on and will spot weld later today.
>
> My problems always pop up when the exhaust hangers put torque on the
> pipe. In the ZJ they are all off to one side so the whole assembly
> tries to rotate.
>
Yeah, then those assembly notches have the murphys law of always
aligning to create a tiny leak.

Then that rear cheap rubber exhaust hanger gets 3 minutes old and tries
to droop your cat back until you get ticked off and create your own with
a bit of neoprene clamped inside the standard cheapass mopar rubber
hanger.

 

Lon Stowell wrote:

> Then that rear cheap rubber exhaust hanger gets 3 minutes old and
> tries to droop your cat back until you get ticked off and create your
> own with a bit of neoprene clamped inside the standard cheapass mopar
> rubber hanger.

Tell me about it. I had to replace the rubber hanger in the ZJ. They
don't make the original part but they have a "newer better one". That
means it doesn't fit. Well, it does if you take a sharp knife to
the darn thing and use a drill to open up the holes a bit more.

--
DougW