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Difference between a cat and a soot trap...

Will L.

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People call them that sometimes incorrectly. So do some suppliers.
A cat actually has rare metals that when heated are a catalyst for altering certain chemicals in a he emissions gasses.
A soot trap is just that- think airfilter except that this collects and stores a grade of carbon and doesn’t let all of it pass through instead of dust.

A cat is very expensive and a soot trap is slightly more than a muffler.
 

FellowTraveler

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People call them that sometimes incorrectly. So do some suppliers.
A cat actually has rare metals that when heated are a catalyst for altering certain chemicals in a he emissions gasses.
A soot trap is just that- think airfilter except that this collects and stores a grade of carbon and doesn’t let all of it pass through instead of dust.

A cat is very expensive and a soot trap is slightly more than a muffler.
Interesting, I can't find listings for exhaust soot traps...
 

THEFERMANATOR

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You have to keep in mind with diesels there is the old style diesel cats that weren't much more than soot traps that held the big soot particles until they broke down, and now they have reactive catylists that have precious metals in them that work in conjunction with the DPF and urea injection systems.
 

FellowTraveler

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You have to keep in mind with diesels there is the old style diesel cats that weren't much more than soot traps that held the big soot particles until they broke down, and now they have reactive catylists that have precious metals in them that work in conjunction with the DPF and urea injection systems.
Thanks FERM, I have a better handle on the tech now, I see for diesel ceramic core types and the precious metals versions along with the big price swing Will L. mentions.
 

MrMarty51

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I suspect, a 4" ID ceramic core unit designed for 850 HP gas would be ok for a 425+- HP diesel, as long as, it is as close to the turbine as possible.
Any thoughts people?
Yeah, I dont know, might be the higher carbon/soot content could cause the cat to overheat and destroy the wehicle it is attached to. 🤷‍♂️
 

Twisted Steel Performance

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I think running a water injection system will help remove the soot from the entire exhaust, you wouldn't need to use it all the time if ya didn't want to, just activate it every week or so maybe, I know on my last build I used water injection and my tail pipe stayed soot free...
 

Will L.

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Run wmi, instead of soot staying in the engine, is all builds up in the cat or soot trap.
To avoid plugging it, a person could do a temp bypass when they plan to blow it all out. but that would of course put more carbon in the air and kill more purple featherless owls or something.
 
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