Cats..

gimedic1 · Apr 20, 2013

Any idea why ford put TWO catalytic converters on 1989 BII? Got two BII's and they both have two..Gonna try to cut one set off, haven't had a muffler on her in years..And are ALL stock exhaust support to be 2.25", Think about trying to put a Red Hot Muffler afterwards..THE O2 Sensor is before Cat, So probably burnt out ANYWAY...

adsm08 · Apr 20, 2013

It is a three way, two bed cat. The chemistry for them wasn't as advanced as it is today and they needed two separate beds to get the stuff in there to do the whole job. Leave them be.

alwaysFlOoReD · Apr 20, 2013

So if newer cats are more advanced wouldn't a new one do the job of the older stock system? I recently sold a truck where I changed the stock cats twice using used stuff. It was on a 97 f150 4.2L and there looks to be four cats, two per side. After screwing around for a day I think I would have been farther ahead to cut out the cats, welding in tube and adding one cat and an extra o2 bung before the muffler. At least that was my plan for the future until seeing adsom08's response.
Comments?

Richard

85_Ranger4x4 · Apr 20, 2013

alwaysFlOoReD said:
So if newer cats are more advanced wouldn't a new one do the job of the older stock system? I recently sold a truck where I changed the stock cats twice using used stuff. It was on a 97 f150 4.2L and there looks to be four cats, two per side. After screwing around for a day I think I would have been farther ahead to cut out the cats, welding in tube and adding one cat and an extra o2 bung before the muffler. At least that was my plan for the future until seeing adsom08's response.
Comments?

Richard

Cats work better the closer they are to the engine, that is probably a lot of the reason they are mounted where they are on newer vehicles.

One other reason that I really like that setup is they are mounted higher which helps prevent a massive grass fire with your truck in the middle of it.

alwaysFlOoReD · Apr 20, 2013

That is something to keep in mind - keeping the cat/s close to the engine. More research is indicated....

Richard

adsm08 · Apr 20, 2013

The later model vehicles have pre and post cats for a number of reasons.

Sometimes it was easier to get the job done with a two bed system. Sometimes it was increased emissions standards. Sometimes it was just to be dicks.

BronKitis · Jan 26, 2014

adsm08, you've answered so many of my questions without even knowing it. I shall leave my cats be.

turbo2256b · Jan 26, 2014

cat closest to the exh manifolp is a light off cat it enables the emmissions to be lower just off start up as the EPA started hammering on emmissions close to innitial starting of the engine something like 30 seconds after start up.
Later ended up requireing a oxy sensor before and after the cat to monitor wether there working or not.

wildbill23c · Jan 26, 2014

adsm08 said:
It is a three way, two bed cat. The chemistry for them wasn't as advanced as it is today and they needed two separate beds to get the stuff in there to do the whole job. Leave them be.

If this setup needs replaced, does the replacement come in 2 pieces or has it been updated to a 1 piece? I saw this exact same setup the other day at the pick-a-part, and wondered if the new parts would be the same or if its now a 1 piece unit.

ab_slack · Jan 26, 2014

wildbill23c said:
If this setup needs replaced, does the replacement come in 2 pieces or has it been updated to a 1 piece? I saw this exact same setup the other day at the pick-a-part, and wondered if the new parts would be the same or if its now a 1 piece unit.

I have an OEM fit replacement. Looks identical to the stop. It is all welded together in a single assembly.

wildbill23c · Jan 26, 2014

ab_slack said:
I have an OEM fit replacement. Looks identical to the stop. It is all welded together in a single assembly.

Ahh, good to know. Been contemplating trying to sell my 84 B2 and get a newer one in better shape. However, I don't think I'm ready to scrap my 84 though. Someone removed the exhaust from the front of the cat to the tailpipe, welded in a 2' piece of pipe then a muffler, so my exhaust ends right under the passenger seat of the B2. What a mess the PO left this thing in. The cost of having a new exhaust installed is going to be more than the B2 is worth :annoyed:

.

ab_slack · Jan 26, 2014

wildbill23c said:
Ahh, good to know. Been contemplating trying to sell my 84 B2 and get a newer one in better shape. However, I don't think I'm ready to scrap my 84 though. Someone removed the exhaust from the front of the cat to the tailpipe, welded in a 2' piece of pipe then a muffler, so my exhaust ends right under the passenger seat of the B2. What a mess the PO left this thing in. The cost of having a new exhaust installed is going to be more than the B2 is worth .

There are generic fit cats which are fairly cheap. This OEM fit one was quite a bit more expensive, around $290 IIRC.

It connects up to the Y pipe where there are two openings into the cat.

The rest of the exhaust back after the cat cost less than $100

wildbill23c · Jan 26, 2014

Thanks, when I have the exhaust done, if I can keep this thing going long enough to even worry about it, I'll check into a universal cat as here in Idaho there isn't much in the way of emissions however, I think the B2 is still new enough to require a cat.

adsm08 · Jan 26, 2014

wildbill23c said:
Thanks, when I have the exhaust done, if I can keep this thing going long enough to even worry about it, I'll check into a universal cat as here in Idaho there isn't much in the way of emissions however, I think the B2 is still new enough to require a cat.

1975 and newer, except Honda Civics until 81 or 83.

wildbill23c · Jan 26, 2014

adsm08 said:
1975 and newer, except Honda Civics until 81 or 83.

Thanks for the reply. This explains why grandpa's 71 F-100 didn't have emissions stuff on it.

Cats..

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