The catalytic converter in my 1991 Volvo 240 is rattling like crazy at about
2400 rpm. It's just been through its MOT and I noticed it was tested as a
'uncatalysed vehicle'. If I remove the cat, replacing it with the old
fashioned centre exhaust section and silencer, would I be breaking any laws?

The only online resource I have (http://www.ukmot.com/manual/appendixB.htm)
doesn't really specify.

Thanks,

Dave

P.S. I know the Volvo is hardly classic yet, but it's all I have when the
Triumph sleeps in the winter.

"D. Brown" wrote in message
...
The catalytic converter in my 1991 Volvo 240 is rattling like crazy at
about 2400 rpm. It's just been through its MOT and I noticed it was tested
as a 'uncatalysed vehicle'. If I remove the cat, replacing it with the old
fashioned centre exhaust section and silencer, would I be breaking any
laws?

The only online resource I have
(http://www.ukmot.com/manual/appendixB.htm) doesn't really specify.

Thanks,

Dave

P.S. I know the Volvo is hardly classic yet, but it's all I have when the
Triumph sleeps in the winter.


You're OK to remove this as due to the age of the car the emmissions test is
at a higher level than later vehicles - and a CAT shouldn't be needed to
pass.

D. Brown ) gurgled happily, sounding much like
they were saying :

The catalytic converter in my 1991 Volvo 240 is rattling like crazy at
about 2400 rpm. It's just been through its MOT and I noticed it was
tested as a 'uncatalysed vehicle'. If I remove the cat, replacing it
with the old fashioned centre exhaust section and silencer, would I be
breaking any laws?

No. A cat's only required on post 8/92 cars.

"DougP" wrote in message
...

"D. Brown" wrote in message
...
The catalytic converter in my 1991 Volvo 240 is rattling like crazy at
about 2400 rpm. It's just been through its MOT and I noticed it was
tested as a 'uncatalysed vehicle'. If I remove the cat, replacing it with
the old fashioned centre exhaust section and silencer, would I be
breaking any laws?

The only online resource I have
(http://www.ukmot.com/manual/appendixB.htm) doesn't really specify.

Thanks,

Dave

P.S. I know the Volvo is hardly classic yet, but it's all I have when the
Triumph sleeps in the winter.


You're OK to remove this as due to the age of the car the emmissions test
is at a higher level than later vehicles - and a CAT shouldn't be needed
to pass.



As I understand it '91 cars had to be fitted with cats by british law (Volvo
and Saab fitted them before then though) but MoT's don't take them into
account until '92 for some reason. Thats why Saab 900 buyers who are
performance oriented tend to buy '91s and replace the cat with straight pipe
for a few more bhp

Ken ) gurgled happily, sounding much like they
were saying :

As I understand it '91 cars had to be fitted with cats by british law
(Volvo and Saab fitted them before then though) but MoT's don't take
them into account until '92 for some reason.

That's because they didn't have to be fitted until 1/8/92. So that's the
MOT date.

The catalytic converter in my 1991 Volvo 240 is rattling like crazy at
about 2400 rpm. It's just been through its MOT and I noticed it was tested
as a 'uncatalysed vehicle'. If I remove the cat, replacing it with the old
fashioned centre exhaust section and silencer, would I be breaking any
laws?

Thanks for all your replies, they've been very helpful.

I'd be interested to hear if anybody has actually done this as to how it
affects the car in general. Obviously it'll shorten the left of the world
because of the emissions, but will fuel economy suffer?

The fuel injection and other electronic wizardry in there was all designed
as one system after all.

When I've done it (cos I probably will) I'll report back and let you know.

Dave

D. Brown ) gurgled happily, sounding much like
they were saying :

I'd be interested to hear if anybody has actually done this as to how
it affects the car in general. Obviously it'll shorten the left of the
world because of the emissions, but will fuel economy suffer?

It'll probably improve without a bloody great big block of stuff in the
middle of the exhaust.

It *may* affect the mixture because of the freer breathing, but - given
that a cat'd be paired with a lambda, it should sort that out
automagically.

In article . 170,
Adrian wrote:
No. A cat's only required on post 8/92 cars.

A cat as such isn't required. The car must just pass the emission regs.
Which in practice means a cat. ;-)

--
*Funny, I don't remember being absent minded.

Dave Plowman London SW
To e-mail, change noise into sound.

"Adrian" wrote in message
. 244.170...


It'll probably improve without a bloody great big block of stuff in the
middle of the exhaust.

It *may* affect the mixture because of the freer breathing, but - given
that a cat'd be paired with a lambda, it should sort that out
automagically.

As Adrian said, you will notice an improvement. I did the same on my 740
2.3 - except I also took out the middle silencer so all I had was the rear
silencer with a straight pipe from the front. Gained an appreciable
performance boost and also if I was feathering it, better fuel consumption.

--
Stuart

"Stuart Gray" me@home wrote in message
...

"Adrian" wrote in message
. 244.170...


It'll probably improve without a bloody great big block of stuff in the
middle of the exhaust.

It *may* affect the mixture because of the freer breathing, but - given
that a cat'd be paired with a lambda, it should sort that out
automagically.

As Adrian said, you will notice an improvement. I did the same on my 740
2.3 - except I also took out the middle silencer so all I had was the rear
silencer with a straight pipe from the front. Gained an appreciable
performance boost and also if I was feathering it, better fuel
consumption.

--

used to rip the cat out of my Xedos 6 and replace it with a bit of pipe, and
bolt the cat back in for MOT tests. ECU cottoned on after a few miles and
all was sweetness and (ever-so-slightly elevated BHP) light. YMMV.

Postscriptum: Aw, hell with it, just do it, the damage has been done to the
environment, let's have scorching December beach parties.