On Fri, 25 Nov 2005 18:31:11 +0000 (GMT), "Dave Plowman (News)"
wrote:

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. ;-)

.....and it applies to the date of manufacture of the engine, not the
car. If you install a replacement engine which dates from before 8/92
- and can prove that fact - then you should be MoTd on the earlier
emissions standards.

David Betts )
The Classic Car Gallery: http://www.ofoto.com/I.jsp?m=17830847103&n=398038677

D. Brown wrote:

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.



Question -

Do cars in Britain have a compliance plate? Here we have a compliance
plate which has the design rules (number) stamped on it which are
applicable at the time the car was manufactured.

Example - So if a car was manufactured in say 1977 at say ADR27 then it
did not have to have a Cat exhaust even though the manufacturer may have
fitted one to comply within another country and then its quite legal for
it to be removed. (the US was the most stringent)

This is our compliance situation.

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

Do cars in Britain have a compliance plate?

No.

The default rules that apply are those that apply to the date of first
registration of the car. If your car gets some kind of exemption or
exception, then it's down to you to prove it.

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.

Yes, it certainly looks easier to just cut the cat out and replace it with a
straight pipe rather than the old fashioned front silencer arrangement. I
was thinking it may be a bit on the loud side if I tried this though? What
was your 740 like noise-wise when you did this?

I had a 240 with the 2.3 in, they're good engines. It easily out-lasted the
body.

Thanks again for your help.

Dave