Vanning.Com is a an authorized Amsoil Dealer | | | Re: Catalytic Converter Mini-Cat
[Re: nikothenomad]
#747730 April 27th 2019 11:12 am April 27th 2019 11:12 am |
Joined: Nov 2013 Posts: 1,275 West Texas Wedgy
old hand
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old hand
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Posts: 1,275 West Texas | Neither my '88 with the 5.2, or the 94 with the 5.9 have that upper cat setup, Nicole. Both are California smog, and both are fuel injected. The B250 5.2 has an air pump, With the 5.9/Rochester, I'd wager to say exhaust tubing from your manifold flange to the exhaust merge is fine, and isn't going to harm the motor any. Depending on your area of registration, you may or may no have a smog check. If so, I'd bet It will still pass with the main Cat only. They aren't going to pull a doghouse... Your Van will love a free flowing exhaust with a decent flowing cat, and muffler. The 454 Chevy setup with the rear pancake cat was ridiculous...  God Bless Texas! | | | Re: Catalytic Converter Mini-Cat
[Re: nikothenomad]
#747736 April 27th 2019 9:29 pm April 27th 2019 9:29 pm |
Joined: Aug 2001 Posts: 12,048 Fircrest, WA Reed
Maniac
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Maniac
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Posts: 12,048 Fircrest, WA | Modern highflow three-way catalytic converters flow better and catalyze better than the old 80s designs. Be sure to get a three way, though.
Windows- they're what make a van worth owning! | | | Re: Catalytic Converter Mini-Cat
[Re: nikothenomad]
#747742 April 28th 2019 12:36 am April 28th 2019 12:36 am |
Joined: Aug 2001 Posts: 12,048 Fircrest, WA Reed
Maniac
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Maniac
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Posts: 12,048 Fircrest, WA | If you have eliminated the air injection pump, then the chances are high the original catalytic converters have failed. You want a universal high-flow three-way catalytic converter that does not have an air injection tube. I am running exactly that on my 89 Ford van. A good one should be $100-$120. Summit racing sells them, you might be able to find one on rockauto using a part number from Summit.
Windows- they're what make a van worth owning! | | | Re: Catalytic Converter Mini-Cat
[Re: nikothenomad]
#747748 April 28th 2019 11:51 am April 28th 2019 11:51 am |
Joined: Aug 2001 Posts: 12,048 Fircrest, WA Reed
Maniac
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Posts: 12,048 Fircrest, WA | The catalyst material is different, as is the designed operating temperature. Before I had my current catalytic converter installed, my smog pump failed so I removed it and capped the line to the old catalytic converter until I could get to it. In that time the old catalytic converter overheated and cracked. Modern catalytic converters have the catalyst matrix in a honeycomb structure. If the catalyst overheats the honeycomb can collapse and cause a blockage. The problem you will have is the fact that your engine still uses a carburetor. The fact is that carbs don't control the fuel mixture tight enough and allow the exhaust gasses to have too many unburned hydrocarbons. This leads to reduced lifespan of the catalytic converter. Having a functioning air injection system helps with longevity of the cat, but it won't last long behind a carbed engine. More info than you ever knew existed about catalytic converters: https://en.wikipedia.org/wiki/Catalytic_converterWhat you can do to get a good, cost-effective, durable cat(s) is to order (or tell the mechanic to put in) a "California-legal" converter. Those are the good ones that last, and they can be ordered in any state. The catalog of Eastern Catalytic, a reputable maker, is HERE, and they show listings for your van. They have universal and direct fit, with and without the air injection tube. The rear direct fit cat for your van is part no. 645332. I don't know what diameter exhaust you are running, but CLICK HERE for a pre-filtered list of the catalytic converters offered by Summit. You can further filter by diameter and inlet size, cost, etc... I would stick to Wlker or Catco for brands.
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