I’m installing a “Catch Can” can on our VW Amarok and this little posting is all about it, but first a bit of history on why I’m installing one.

If you look at modern high performance diesel engines one of the things that they do to reduce emissions is have a number of systems to reduce the harmful emissions. EGR or Exhaust Gas Re-circulation wich is feeding part of the engines exhaust back into the intake but probably the most widely known is the DPF… or Diesel Particulate Filter which captures fine soot particles from exiting the exhaust. The DPF needs to be cleaned regularly, through a process called regeneration. Either active, passive or forced, the accumulated soot is burnt off at high temperature (around 600°c) to leave only a residue of ash, effectively renewing or regenerating the filter, ready to take on more pollution from the engine. To regenerate, the vehicle electronics adjust the timing of the engine to increase the exhaust gas temperatures or commonly it can be achieved by passive regeneration usually on the motorway when exhaust gasses are generally hotter. Continue reading →