Thread: remove cat

To remove nasty emissions before the exhaust hits the environment...?

Originally Posted by Brian

I have a question which may be relevant,
Why do diesel engines need a catalytic converter?
Surely this is an important consideration in all the above replies?

I can understand why petrol engines need one,
Thanks

Same reason, just a slightly different type of cat...

For compression-ignition (i.e., diesel) engines, the most commonly used catalytic converter is the diesel oxidation catalyst. This uses excess O2 (oxygen) in the exhaust gas stream to oxidize CO (carbon monoxide) to CO2 (carbon dioxide) and HC (hydrocarbons) to H2O (water) and CO2.

Originally Posted by isuzurover

Same reason, just a slightly different type of cjklat...

So why does my 04 D2a Td5 not have a cat ? Still got the factory exhaust and there's no evidence that it ever has a cat fitted ??

Kev..

Why does my 95 Tdi not have one..

Originally Posted by Fluids

So why does my 04 D2a Td5 not have a cat ? Still got the factory exhaust and there's no evidence that it ever has a cat fitted ??

Kev..

I have a 2004 D2 td5 and my car has a cat, completely stock.

Originally Posted by VladTepes

Why does my 95 Tdi not have one..

Whether your vehicle has a cat or not depends on when the emissions regs came in, and how clean the engine is.

As mentioned, commercial vehicles were different from passenger cars. Some of the EFI diesels with high pressure commonrail injection and EGR managed to get their emissions clean enough that they met EURO III standards without much aftertreatment.

Originally Posted by Fluids

So why does my 04 D2a Td5 not have a cat ? Still got the factory exhaust and there's no evidence that it ever has a cat fitted ??

Kev..

The cat is the small round can in the turbo pipe just as it runs under the firewall.
If you have an MY03 onwards, they're EURO3 which are cat systems.
If it's not there, it's been removed.

Cheers

Andrew

ah maybe im not looking in the right place ? If theres on on a Defender Tdi where would it be ?