Can a catalytic converter be placed backwards ?

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Old Dec 3, 2004 | 10:51 PM
  #1  
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Default Can a catalytic converter be placed backwards ?

Just wondering, I have a cat sitting here with no flanges or no labels in or out. Anyone know for sure ?
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Old Dec 4, 2004 | 12:32 AM
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Default Re: Can a catalytic converter be placed backwards ? (90blackcrx)

ehhh i am pretty sur eit will only bolt up one way. if i remember corrctly the front most side has only 2 botls while the back side has 3. what company is it?
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Old Dec 4, 2004 | 02:04 AM
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Default Re: Can a catalytic converter be placed backwards ? (90blackcrx)

i believe so. a cat will be either 2 or 3 stage and the gases need to go in the specific order to work properly.
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Old Dec 4, 2004 | 09:34 AM
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Default Re: Can a catalytic converter be placed backwards ? (Recluse03)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Recluse03 &raquo;</TD></TR><TR><TD CLASS="quote">ehhh i am pretty sur eit will only bolt up one way. if i remember corrctly the front most side has only 2 botls while the back side has 3. what company is it?</TD></TR></TABLE>

Reading owns you, it has no flanges on it.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Tyson &raquo;</TD></TR><TR><TD CLASS="quote">i believe so. a cat will be either 2 or 3 stage and the gases need to go in the specific order to work properly. </TD></TR></TABLE>

Yes now thinking about that, that is true. But how do I figure out which way this cat goes ? I forgot the real name of it, but what side is the little tube usually coming out on ? And which way is it suppose to point, I thought it was suppose to be on the driver side facing the engine.
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Old Dec 4, 2004 | 10:36 AM
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Default Re: Can a catalytic converter be placed backwards ? (90blackcrx)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 90blackcrx &raquo;</TD></TR><TR><TD CLASS="quote">but what side is the little tube usually coming out on ? And which way is it suppose to point, I thought it was suppose to be on the driver side facing the engine.</TD></TR></TABLE>
From what I've seen you're correct. They point forward.....and on driver side. I'm wondering what those air tubes are really for....
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Old Dec 4, 2004 | 10:43 AM
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Default Re: Can a catalytic converter be placed backwards ? (90blackcrx)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 90blackcrx &raquo;</TD></TR><TR><TD CLASS="quote">Just wondering, I have a cat sitting here with no flanges or no labels in or out. Anyone know for sure ?</TD></TR></TABLE>

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Recluse03 &raquo;</TD></TR><TR><TD CLASS="quote">ehhh i am pretty sur eit will only bolt up one way. if i remember corrctly the front most side has only 2 botls while the back side has 3. what company is it?</TD></TR></TABLE>

Think next time before you reply.

I think it would go one way as well, but not 100% sure.

Anyone have pics to post?

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Old Dec 4, 2004 | 12:49 PM
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Default Re: Can a catalytic converter be placed backwards ? (MestizoRacer310)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by MestizoRacer310 &raquo;</TD></TR><TR><TD CLASS="quote">
From what I've seen you're correct. They point forward.....and on driver side. I'm wondering what those air tubes are really for....</TD></TR></TABLE>

From what I understand an air pump can be hooked up to it so you can pump freash air into your exhaust. Does anyone else know what way it goes for sure ? Any pics would be great.
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Old Dec 4, 2004 | 01:05 PM
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Default Re: Can a catalytic converter be placed backwards ? (90blackcrx)

darker side is from the engine to cat. Lighter side of the comb is where the gas leaves and exits out of the exhaust. Does that help?
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Old Dec 4, 2004 | 01:07 PM
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Default Re: Can a catalytic converter be placed backwards ? (UltimX)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by UltimX &raquo;</TD></TR><TR><TD CLASS="quote">darker side is from the engine to cat. Lighter side of the comb is where the gas leaves and exits out of the exhaust. Does that help?</TD></TR></TABLE>

No because last I looked the cat was pretty dirty on both sides, its been used before.
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Old Dec 4, 2004 | 01:57 PM
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Default Re: Can a catalytic converter be placed backwards ? (90blackcrx)

the tube is an air inlet tube as stated previously. not sure of actual placement but mine was installed withe the tube facing foward on the driver's side. i doubt it would matter since a cat is onlya metal composite screen that reacts with exhaust gasses to reduce the pollutants. i would just install it how the other post mentioned. tube forward on drivers side.
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Old Dec 4, 2004 | 02:54 PM
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Default Re: Can a catalytic converter be placed backwards ? (mr. carpenter)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by mr. carpenter &raquo;</TD></TR><TR><TD CLASS="quote">tube forward on drivers side.</TD></TR></TABLE>

That is the air injection tube, and it's used for emissions, to attach an air pump to. Basically legal cheating on emissions by a manufacturer.
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Old Dec 4, 2004 | 03:30 PM
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Default Re: Can a catalytic converter be placed backwards ? (drdisco69)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by drdisco69 &raquo;</TD></TR><TR><TD CLASS="quote">
That is the air injection tube, and it's used for emissions, to attach an air pump to. Basically legal cheating on emissions by a manufacturer. </TD></TR></TABLE>

lol yep , anyways I am gonna install it that way because thats the way I thought it went and everyone else is confirming it. Thanks
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Old Dec 5, 2004 | 08:12 AM
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Default Re: Can a catalytic converter be placed backwards ? (90blackcrx)

I don't think that it makes any difference which way you mount it.

However, I was in much the same situation with the aftermarket one I bought and mounted it so that the air injection tube (capped off) points forward. The thought being that if it was going into a car that had an air pipe, it wouldn't make sense to have it pointing rearward (the hook-up pipe would have to be longer).

Wes
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Old Dec 5, 2004 | 10:51 AM
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Default Re: Can a catalytic converter be placed backwards ? (Wes V)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Wes V &raquo;</TD></TR><TR><TD CLASS="quote">I don't think that it makes any difference which way you mount it.
</TD></TR></TABLE>

I beg to differ:

http://auto.howstuffworks.com/...2.htm

Without the NOx being reduced to nitrogen and oxygen in the reduction, the oxidation stage won't have enough oxygen to react with the carbon monixide to for carbon dioxide.
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Old Dec 5, 2004 | 12:06 PM
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Default Re: Can a catalytic converter be placed backwards ? (drdisco69)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by drdisco69 &raquo;</TD></TR><TR><TD CLASS="quote">
Without the NOx being reduced to nitrogen and oxygen in the reduction, the oxidation stage won't have enough oxygen to react with the carbon monixide to for carbon dioxide.</TD></TR></TABLE>

I just learned something about that in class. The 3 way cats have the NoX reducing stuff come first, rather than last like they used to. I wasnt really paying attention as u can tell...lol
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