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NCT: Emissions test for 1993 and older
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18-02-2010 5:34pm#1
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A link to the NCT manual is in the charter
(4) For vehicles first registered before 1st day of October, 1986, the carbon
Emission monoxide content is more than 4.5% at idling speed.
(5) For vehicles first registered on or after 1st day of October, 1986, up to
31st December, 1993, the carbon monoxide content at idling speed is
more than 3.5%.
(6) For vehicles first registered on or after 1st day of January, 1994, the
carbon monoxide content at idling speed is more than 0.5%.
(7) For vehicles first registered on or after 1st day of January, 1994, the
carbon monoxide content at 2,500 R.P.M. or at a speed specified by the
vehicle manufacturer is more than 0.3%.
(8) For vehicles first registered on or after 1st day of July 2002 the carbon
monoxide ad idling speed is more than 0.3%.
(9) For vehicles first registered on or after 1st day of July 2002 the carbon
monoxide at 2500 R.P.M. or at a speed specified by the vehicle
manufacturer is more than 0.2%.
Hydrocarbon (H.C.) (10) For vehicles first registered before 1st October, 1986, the hydrocarbon
content at idling speed is more than 1,000 P.P.M.
(11) For vehicles first registered on or after 1st day of October,1986, up to
31st December, 1993, the hydrocarbon content at idling speed is more
than 750 P.P.M.
(12) For vehicles first registered on or after 1st day of January, 1994, the
hydrocarbon content at 2,500 R.P.M. or at a speed specified by the
vehicle manufacturer is more than 200 P.P.M.
Lambda (13) For vehicles first registered on or after 1st day of January, 1994, the
lambda value at 2,500 R.P.M. or at the speed specified by the vehicle
manufacturer is not 1± .03 or within the vehicle manufacturers
recommendation.
Linky
pre EURO 93 emission norm cars (without cat) are only tested for CO and HC and only at low idle (750RPM). The limits are 4.5% and 1000ppm respectively0 -
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From what I see, there are feck all pre '93 cars on the road anyway.
...speak for yourself !
Ode To The Motorist
“And my existence, while grotesque and incomprehensible to you, generates funds to the exchequer. You don't want to acknowledge that as truth because, deep down in places you don't talk about at the Green Party, you want me on that road, you need me on that road. We use words like freedom, enjoyment, sport and community. We use these words as the backbone of a life spent instilling those values in our families and loved ones. You use them as a punch line. I have neither the time nor the inclination to explain myself to a man who rises and sleeps under the tax revenue and the very freedom to spend it that I provide, and then questions the manner in which I provide it. I would rather you just said "thank you" and went on your way. Otherwise I suggest you pick up a bus pass and get the ********* ********* off the road”
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I know at least two people with pre-'94 cars and they never have trouble with the emissions tests. I don't know if they have cats or not ('91 Corolla 1.3 and '92 EG Civic 1.5 LS), but more surprisingly they are both complete rustbuckets and still get through the NCT. I suspect they just let my grandad's car through out of pity (he's in his 80s)
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Well to clarify Im not talking about some 1.4litre rusty old thing. If other users reports are true, then I stand to gain about 25bhp and over 1mpg improvement on my 850CSi (5.6litre 1993) by gutting the Cats completely. They are prolly not broken (expensive at the time steel "race" cats) but they did take a massive amount of heat when my O2 sensors were broken. Hot enough to turn chrome exhaust parts golden and stainless steel pipe blue with 2days of driving..
I know our Allroad ('2000 2.7T V6) got 0.6% on 2500rpm test with no Cats but running on 100% E85.. but I cant/wont run the the 850 on that much E85. It would run mega lean. I would run it on E5 or maybe E15'ish blend though. And of course to tie in another thread, a helping of Dipetane might work too.
B]EDIT: And then I re-read:[/B
Thanks for the link. So you are saying that my car with Cat would be tested in a test that cars with no Cat are meant to pass? I should have no worries about passing it with the Cat removed then!?A link to the NCT manual is in the charter
pre EURO 93 emission norm cars (without cat) are only tested for CO and HC and only at low idle (750RPM). The limits are 4.5% and 1000ppm respectively0 -
...speak for yourself !zilog_jones wrote: »I know at least two people with pre-'94 cars and they never have trouble with the emissions tests. I don't know if they have cats or not ('91 Corolla 1.3 and '92 EG Civic 1.5 LS), but more surprisingly they are both complete rustbuckets and still get through the NCT. I suspect they just let my grandad's car through out of pity (he's in his 80s)
I'd actually love to see more old cars on the road. I think it's a shame that most of them end their life prematurely in Ireland due to our overall neglect for cars as a nation and our registration system.0 -
Matt Simis wrote: »So you are saying that my car with Cat would be tested in a test that cars with no Cat are meant to pass? I should have no worries about passing it with the Cat removed then!?
It should think so. Unless there is a requirement that if the car originally came with the cat, it should be tested with it. You look it up
My '86 4.7l V8 Porsche (no cat) passed well within the limits twice in the past 2 years.0 -
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Incorrect. See my linky. Makes no difference if the car is petrol or diesel...
Im reading the same manual as you UnkelNCT Manual - Page 3 wrote:EXHAUST SMOKE (DIESEL)
Method of Testing
(A metered smoke test does not apply to vehicles registered before 1st January, 1980)
NOTES: (Vehicles registered on or after 1st January, 1980)
(a) No smoke test should be carried out without having done the pre test check detailed on page 5.
(b) It is absolutely essential that the engine is at normal operating temperature before carrying out a
smoke test. Testers should ensure that engines are not warmed up by being left idling or at half
throttle. They should be warmed up by normal driving.
(c) Engines left idling for any length of time will show a high smoke opacity reading.
(d) When carrying out this test the throttle must not be “blipped”.
Vehicles registered on or after 1st January, 1980
1. Check visually that the emission control system is complete and properly connected and that there are no leaks
in the exhaust system.
2. With the engine at normal operating temperature, raise the engine speed slowly to 2,500 r.p.m. or half the engine
manufacturer’s recommended governed speed whichever is less and hold for 20 seconds in order to purge the
exhaust system. If the engine emits any unusual noises the test should be abandoned. Slowly raise the engine
speed to its maximum r.p.m. and note if the governor operates within the vehicle manufacturers’ recommended
R.P.M. setting. If not the test should be discontinued. Do not hold the engine at maximum r.p.m. for any
length of time.
3. Connect the diesel smoke meter to the vehicle following the smoke meter manufacturers’ instructions. Depress
the accelerator pedal firmly from the idling position to the maximum fuel delivery position following the prompts
of the smoke meter. The smoke meter is programmed to ignore the first reading. The operation is repeated and
if the reading on this occasion is less than 60% of the acceptable limit the test is ended. If the reading is not less
than 60% of the acceptable limit, the operation is repeated. If the average of this and the previous reading is
within the acceptable limit the test is ended. If the average readings are not within the limits the operation is
repeated up to a maximum of 3 more times taking the average of the last 2 readings after which the test is ended.0 -
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