Video: Watch What Happens Inside a Catalytic Converter

https://www.youtube.com/embed/ekQcy6GN1pM

Take the catalytic converter: It's fairly well understood that it helps keep nasty particulates from entering the air via, but what it look like when the engine is actually running? Well, wonder no more.

alfadriver (Forum Supporter)
alfadriver (Forum Supporter) MegaDork
8/13/20 9:10 a.m.

Some comments- he thinks that it's great that the catalyst got hot when it ran rich.  It's not the rich part that makes it run really hot, it's the misfires that makes it run hot. 

Catalysts work the best when the mixture is stoichiometry- and pretty tight around that.

Also, the movement in the brick is because he cut so much out- they don't move.

The last thing- temps (right now) max out at just over 1700 F normally.  When it gets bright hot- that's considerably hotter.

WonkoTheSane (Forum Supporter)
WonkoTheSane (Forum Supporter) SuperDork
8/13/20 10:31 a.m.
alfadriver (Forum Supporter) said:

Some comments- he thinks that it's great that the catalyst got hot when it ran rich.  It's not the rich part that makes it run really hot, it's the misfires that makes it run hot. 

Catalysts work the best when the mixture is stoichiometry- and pretty tight around that.

Also, the movement in the brick is because he cut so much out- they don't move.

The last thing- temps (right now) max out at just over 1700 F normally.  When it gets bright hot- that's considerably hotter.

Just as note of fairness to the guy who made the video.. He does acknowledge that in the comments, that what he meant is that "He really likes it! The cat hates it, Lol"  when he was enriching the mixture..

einy (Forum Supporter)
einy (Forum Supporter) Dork
8/13/20 12:08 p.m.

Recently came up on a car driving down the freeway at night with a cool looking orange glow under it ... clearly was not neon lighting once I got up closer to it, but instead the cat.  He must have been running rich as heck to achieve that level of illumination!  Small wonder the car didn't start on fire, but I guess that head shield above the cat was doing its thing to prevent that.

alfadriver (Forum Supporter)
alfadriver (Forum Supporter) MegaDork
8/13/20 12:15 p.m.
einy (Forum Supporter) said:

Recently came up on a car driving down the freeway at night with a cool looking orange glow under it ... clearly was not neon lighting once I got up closer to it, but instead the cat.  He must have been running rich as heck to achieve that level of illumination!  Small wonder the car didn't start on fire, but I guess that head shield above the cat was doing its thing to prevent that.

It's misfiring.  Running rich actually cools the catalyst down.  Running with misfires will burn it up at almost any a/f.  

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