On: Mechanic put in prison for selling 14000 truck emission bypass devices

[bumby]

High temps in the catalytic converter can sinter the precious metals, reducing the surface area of catalytically active surfaces, but I believe the effect is much more pronounced in CO and HC activation. The conversion of NOx is much more constant.

[sudosysgen → bumby]

Ah, I was under the impression this wasn't the case, so you're probably right. Do you have a source I could refer to?

[bumby → sudosysgen]

Internal Combustion Engine Handbook by van Basshuysen and Schafer. My edition is rather old (2004) so there may a newer one with different info as diesel and emission tech has changed a bit in the last 20 years.

[sudosysgen → bumby]

Thank you! I'll take a look and try to find a more up to date source if possible.