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Home > A-Series EFI / Injection > Exhaust Gas Analyser readings

Rod S

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5988 Posts
Member #: 2024
Formally Retired

Rural Suffolk

On 3rd Sep, 2010 John said:
I really should check the vin on my spi shell. It's an early K plate but dunno if I would get away with it.


Emissions are based on the date of manufacture of the ENGINE - but the onus is on the person presenting the vehicle for test to prove an earlier engine is fitted if claiming an earlier "higher" limit. See the very first paragraph in section 7.3 of the Tester's Manual.

Schrödinger's cat - so which one am I ???


Paul S

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8604 Posts
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Formerly Axel

Podland

True, but in the absence of an engine number, they assume it is the engine listed in the V5.

Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
Stephen Hawking - "The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge."


John

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Mongo

Barnsley, South Flatcapshire

^ As Above!

If something is worth doing, it's worth doing half of.


Rod S

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5988 Posts
Member #: 2024
Formally Retired

Rural Suffolk

So put the right engine number on the block and change it in the V5 (cost of a stamp)...... :)

If we're talking old carb'd Metro Turbo engines - or a newer block that's been converted to one - just use one of the Turbo series numbers. The aluminium plates are about £1 and you're doing nothing wrong in my opinion as the parts of the engine you are using - the turbo and museum piece known as a carb - belong in the high emissions years :) :) :)

Edited by Rod S on 3rd Sep, 2010.

Schrödinger's cat - so which one am I ???


Paul S

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8604 Posts
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Formerly Axel

Podland

You then fall foul of the DVLA and their ridiculous requirements to record engine changes, particularly when you have put in a smaller engine as I have done.

Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
Stephen Hawking - "The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge."


Rod S

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5988 Posts
Member #: 2024
Formally Retired

Rural Suffolk

On 3rd Sep, 2010 Paul S said:
You then fall foul of the DVLA and their ridiculous requirements to record engine changes, particularly when you have put in a smaller engine as I have done.


So far as I can tell, they are only throwing their toys out of the cot at DVLA over engine SIZE changes.

I've done two engine number changes in the last year with no problem whatsoever even though, in one case, I sent the V5 back in quick succession as I'd forgot the colour change.

But even if you have the wrong engine number, or no engine number if the block was skimmed and label lost, it shouldn't be hard to prove to the tester that the carb'd turbo A Series was only ever fitted to early cars, ie, pre CAT.

Schrödinger's cat - so which one am I ???


Mr Joshua

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Member #: 1954
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Luton Bedfordshire

Due to the age of my car it does not need an emmisions test but I asked for one anyway, the CO was 0.63 the line it appeared on on the monitor was green so I thought this to be a good sign. The tester shook his head and said that is "way to low for this car I would expect to see it up around 2.5 to 3". At that out came the screwdriver and the mixture was adjusted till it read 2.76. This tranformed the car.

I was not sure if you were running carbs or injection but for carbs the high CO is not a shocker to a tester that knows the A series.

Rob.

Own the day


stevieturbo

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Northern Ireland




On 3rd Sep, 2010 Paul S said:

At the 2009 MOT, CO was 2.571 %vol and HC 308ppm

This morning, both levels have dropped to CO 2.239 and HC 162.

The only change has been a new set of leads and plugs, oil change and a better fuel pressure regulator.

They are now testing against a CO limit of 3.5, so it passes OK.

However, the CO seems high compared to my high milegae Focus that recorded a CO of 0.009!

Is this due to the lack of a Cat?


The cat changes CO and various other allegedly nasty gasses into CO2, so it will account for some reduction. They also remove
/convert/help in the reduction of hydrocarbons, so again they should be mega low.
Although even without a cat, modern cars will easily run below 1% CO and below 200ppm HCC anyway.
Modern cars are very very efficient and generally CO will be very very low anyway, and they will still run silky smooth. Mild cams, well designed injection systems and closed loop operation all see to that.

9.85 @ 145mph
202mph standing mile
speed didn't kill me, but taxation probably will

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