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3 Way Cat Convertor Vs Compliance Cat?

dead32

By dead32,
in Engines & Forced Induction

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GeeTR Grand Master

GeeTR

Posted
Posted

Wikipedia tells me that...

For spark ignition engines, the most commonly used catalytic converter is the three-way converter which converts the three main pollutants of concern — CO, HC, and NOx— to less-toxic substances. The control of NOx involves a reduction process that releases oxygen and the control of CO and HC involves an oxidation process that consumes oxygen. Therefore, a 3-way converter contains two catalyst-coated stages: The first catalyst stage encountered by the exhaust is for reduction of NOx, which produces oxygen employed by the second stage to oxidize CO and HC...

&

Two-way (or oxidation) converters act only to control CO and HC, and have therefore been abandoned on conventional spark ignition engines in most jurisdictions due to an inability to control NOx.

Reading that, I would think all cats fitted nowdays are 3-way.

Cats are every where, from cheap $300 3" to $600 4" from the US (Metallic substrate, this is a performance forum)

Hope that helps

Shaun Mentor

Shaun

Posted
Posted
interesting thing i found when i was at a local compliance shop today - on a shelf there were heaps of boxes of metalcat cats...

Whats wrong with metalcat? I thought they were stamped and came with a certificate of certification (if that makes sense). I was gonna get one next week; i think i might have to get an emissions test so i want one that is pretty f**king good.

Shaun.

GeeTR Grand Master

GeeTR

Posted
Posted
Whats wrong with metalcat? I thought they were stamped and came with a certificate of certification (if that makes sense). I was gonna get one next week; i think i might have to get an emissions test so i want one that is pretty f**king good.

Shaun.

They'll pass a visual inspection, but not so sure about a proper emissions test. Have you read GuiltToys threads? Some good stuff there.

shanef Grand Master

shanef

Posted
Posted
Whats wrong with metalcat? I thought they were stamped and came with a certificate of certification (if that makes sense). I was gonna get one next week; i think i might have to get an emissions test so i want one that is pretty f**king good.

Shaun.

what i was getting at was they are a decent cat and some compliance shops use them, plus'

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