16-03-2012, 11:15 AM
Ruan Wrote:Our engines do not have a DPF.
They have a Catalytic Converter, just like a petrol car. Except it tends not to do the Carbon Monoxide > Carbon Dioxide as much, as Diesels don't tend to produce much CO... Mostly converting HC to CO2 and H2O...
CO + O2 = CO2
HC + O2 = CO2 + H2O
Don't ask me to balance that...
The main complication is the presence of the EGR too.
A diesel without EGR runs really lean. So you get rid of NOx as much, but I think you get more CO and HC. NOx turns to smog with UV light (sun), so that is why it was implemented.
That is why if you de-cat, you are best dumping the EGR too, since they are designed to work in unison. EGR on it's own is just evil in a different way to not being there at all hehe
Imagine having DPF and a catalyst, and EGR haha!
Those DPF are just a new type of thing to rip off your car once it's out of warranty. The amount of cars that must end up going to the scrappers because owners can't afford the fix costs vs just removing it and having the car trundle on in otherwise perfect working condition for years on end is beyond me.
I'm sure it's ecologically worse to build more new cars, than just let older ones be a bit more dirty but last many times more years!
I also wonder how much these systems cost to make/add initially too, for how much they actually make the car cleaner over say 10 years... remembering after the first 3 years it's probably costing you 10% fuel economy and possibly not running properly any more.
There is nothing better in life than a diesel running free to atmosphere after the turbo
Dave