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-   -   Emissions tests for cars built in the 90's (http://www.haynes.co.uk/forums/showthread.php?t=6187)

CTWV50 29th March 2011 06:34 PM

Emissions tests for cars built in the 90's
I though this would help people when choosing a donor.
“The lack of a catalytic converter is not an automatic fail in itself, but a vehicle may struggle to meet the required emission limits without one. Prior to 31 July 1992, a spark ignition engine is required to meet limits of CO<=3.5% and HC<=1200ppm. Between 1 August 1992 and 31July 1995, the limits will depend on whether or not the vehicle is listed in the current edition of the In Service Exhaust Emission Standards for Road Vehicles book ( currently the Ninth Edition) which all MOT stations are required to hold. If there is an exact match in this book for the vehicle ( regarding engine number/type, model, chassis no, etc. The exact requirements vary between manufacturers) then the vehicle will be tested to the limits in the book. If an exact match cannot be found, the vehicle will again need to meet limits of CO<=3.5% and HC<=1200ppm. I have looked up your particular model and engine and, as stated in your e-mail, this combination is not listed and therefore the vehicle would need to meet limits of CO<=3.5% and HC<=1200ppm. From 1 August 1995, the requirements again depend on whether or not the vehicle is listed in the Emissions book. As your particular combination is not listed, vehicles of this age would need to be tested to the following limits: Minimum oil temperature : 60C Idle (450 - 1500rpm) CO<=4.5% Fast Idle (2500-3000rpm) CO<=0.3% HC<=200ppm Lambda= 0.97 to 1.03 There is one possible exemption to the above requirements. If the customer can provide a letter from the manufacturer, quoting the chassis number and engine number of the vehicle, stating that the engine as originally installed could not meet the relevant UK emissions limits. In this case, the vehicle can be tested to the next lowest limit.” Hope this clears things up...


deezee 29th March 2011 07:23 PM

The best thing to do when picking your engine, is referring to the IVA hand book. The test information varies against that given for checking MR2 imports during an MOT.

Ultimately, for the IVA, you need to prove your engine was produced before August 1995, to avoid the Cat test.

brainbug007 29th March 2011 09:03 PM

This is interesting, I thought if your donor had a cat you'd automatically have to fit a cat. Mine was made in 1993 (k plate) so hopefully it'll pass without one :)

leroybrown911 29th March 2011 10:26 PM

Excellent info and very topical at the minute.


CTWV50 30th March 2011 06:10 AM

I built a VW Corrado G60 engine pushing out 220whp with a 2.0 litre block (original was 1.8) and no CAT running digifant engine management. It used to fly through the 3.5% CO 1200ppm HC idle test. It always had 0.5% co and 200ppm apart from when the lambda signal wire had broken.:rolleyes:


brainbug007 15th July 2011 11:02 AM

Came across this while digging, there's an excel link at the bottom for what I think is the contents of the emissions book. Unfortunately the cvh comes up as needing a cat as the co2 limit is 0.5% :(

http://www.dft.gov.uk/vosa/inservice...vehicles. htm

Big Vern 15th July 2011 11:13 AM

As suggested by DeeZee above it's what is in the IVA manual that matters.
So long as your haynes roadster is fitted with an engine from a pre August 1995 donor which the CVH is then no cat is required. The rules are different how ever for imports and rebuilt production cars.
The haynes roadster is not listed as no production haynes roadsters have ever existed and therefore no type approval emissions data submitted by the manufacturer.
No exact match means no cat required before Auig '95 - It's all in the IVA manual.


brainbug007 15th July 2011 11:18 AM

Ah I mis-interepeted it then, I thought it would be based on them matching the donor not the roadster :)

Big Vern 15th July 2011 07:27 PM


Originally Posted by brainbug007 (Post 61239)
Ah I mis-interepeted it then, I thought it would be based on them matching the donor not the roadster :)

I think this catches quite a few people out.
Whether IVA or MOT it is the vehicle 'as presented' and as the haynes roadster isn't a mass produced car then there will be no match.
This means they have to follow a chart which eventually leads them to non cat emissions test.

Once the car hs been IVA'd the required emissions test should automatically come up on the MOT computer.


robo 16th July 2011 10:38 PM

If this is the case then, if my build is not made up from a donor car just a pile of bits all i need to do is prove that the engine is pre 1995!! and shove it on a Q.

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