Hdi's and catalytic converters???

falling-out-with-my-car · Post by **falling-out-with-my-car** » 11 Apr 2008, 09:53

Hello everyone,

can anybody tell me please if when buyin a used HDI engined diesel car can I remove the cat like I did on my 98 diesel Xantia and still pass the MoT? the earlier engine doesn't need a cat to pass the MOt so I thought Id have it removed for a straight pipe to fit a 1995 xantia kwik fit obliged and it saved me 250 quid.

Regards Nigel.

lolingram · Post by **lolingram** » 11 Apr 2008, 10:15

DickieG · Post by **DickieG** » 11 Apr 2008, 17:15

My HDi has had the cat removed, a straight section of pipe welded in and it passes the MOT no problem.

bernie · Post by **bernie** » 12 Apr 2008, 11:22

And it was this very helpful chap that made up the new stainless pipe to my diamensions and I welded it on.

Andy at
http://stores.ebay.co.uk/Sporty-Exhaust ... esstQQtZkm

mention my name

deian · Post by **deian** » 12 Apr 2008, 18:14

Diesel cars don't need a Cat to pass the MOT.

Post by **myglaren** » 12 Apr 2008, 19:09

Anyone got any official confirmation of that before I dump mine and get a bespoke SS exhaust?

deian · Post by **deian** » 12 Apr 2008, 19:20

Petrol cars before K can ditch the cat. After K reg you have to keep it to pass the MOT.

Because diesel care haven't got carbon monoxide the cat can be safely removed. Can't find proof, but talk to an MOT guy.

Post by **myglaren** » 12 Apr 2008, 19:55

deian wrote:Petrol cars before K can ditch the cat. After K reg you have to keep it to pass the MOT.

Because diesel care haven't got carbon monoxide the cat can be safely removed. Can't find proof, but talk to an MOT guy.

Thanks deian.
I wonder why they bother to fit them in the first place if you can chuck them away?
The guy who owns the local motor parts shop had a 607 2.2 HDi and one of the reasons he ditched it was the cost of replacing the cat and doing the EOLYS/DPF thing.

DickieG · Post by **DickieG** » 12 Apr 2008, 21:14

myglaren wrote:I wonder why they bother to fit them in the first place if you can chuck them away?

They are fitted to reduce the amount of NOX (Nitrates of Oxygen IIRC) emitted from the car, but the MOT only tests for smoke particulates, hence no need to have a cat fitted at MOT time

myglaren wrote:The guy who owns the local motor parts shop had a 607 2.2 HDi and one of the reasons he ditched it was the cost of replacing the cat and doing the EOLYS/DPF thing.

That's a separate issue, particulate filters.

falling-out-with-my-car · Post by **falling-out-with-my-car** » 13 Apr 2008, 12:50

Steve,

We have Europe to thank for the lowley catalytic converter, it is a manufacturers standard to fit it on diesel and petrol vechicles,only diesels don't need them, to cut a long story short and my blogs can be to long sometimes. Our refineries were told by the goverment to find a way to cut carbon dioxide and NOX emmissions from the burning of road fuel, the refineries knew it would cost them to much money to re-tool so the refinerys said to the goverment have you heard of the catalytic converter?
Thus passing the cost of creating cleaner fuel to the consumer.
The so called clean fuel at the pump is a con and a way to stretch fuel output a bit further to make more money for the refineries.
Ask yourself a question if we have so called cleaner fuel why do we need a catalytic converter in the vechicle? somebody is making a packet and not being totally honest with us consumers. wouldn't it just be easier to re-tool and make cleaner fuel? Either way it looks like my question has raised something some ppl were not aware of and it might save them a few quid along the way.

Regards Nigel.

Post by **myglaren** » 13 Apr 2008, 14:00

Thanks, fowmc.
Your argument does smack of common sense.
When the cat fails, I'll just get a complete SS exhaust system made, assuming I still have the car.

I'm sure there is a lot of smoke and mirrors involved in fuel manufacture and distribution. I buy mine from Sainsbury's currently and have seen all sorts of different tankers delivering there, you could be putting anything in your tank and never know what.

Like Maggie Thatcher's argument that leadless petrol was a load of bollocks but nobody listened to her. Only thing she was right about in my experience.