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curious emissions units
spunky - 8/4/04 at 10:16 AM

Hi all, anyone help this Noobie.

Had my letter back from Honda stating age of the engine, it also gives the gas emissions analysis as follows:

CO-8.1530 G/KM
HC-1.0390 G/KM
NOx-0.1460 G/KM

Has anyone come across these units before? Is it grams per Kilometer or possibly grams per cubic meter? or something else and how on earth do you convert to % and ppm!

Accademic really as its a 2000 engine it will fall into cat emissions test.
Just curious to see how the motor is running.

Many thanks
John

matt_claydon - 8/4/04 at 11:01 AM

It's grams per kilometer - the new way that emissions are quoted by manufacturers. For new vehicles from 2001 the amount of road tax you pay is based on the emission of CO2 in g/km.

Matt.

spunky - 8/4/04 at 12:30 PM

Thanks Matt,
I figured it could be that, but surely that quantifies the emissions while the vehicle is being driven which which in turn depends on the weight of your right foot, gear selection, altitude, ambient temp etc.
I'd like to know how they calculate g/Km in a static test.....!!!

matt_claydon - 8/4/04 at 12:43 PM

I guess it's just some kind of arbitrary average that the manufacturers come up with - I think it's only used for e.g tax purposes. At the MOT I think they still have standard limits the same for all cars of a particular age in terms of ppm or whatever.

Cheers,
Matt.

stephen_gusterson - 8/4/04 at 03:05 PM

quote:
Originally posted by matt_claydon
I guess it's just some kind of arbitrary average that the manufacturers come up with - I think it's only used for e.g tax purposes. At the MOT I think they still have standard limits the same for all cars of a particular age in terms of ppm or whatever.

Cheers,
Matt.




those figures look too low.

cars tend to be from 150 - 400 or so gm/km

8 or so for the C0 is really improbably low!!!!!


atb

steve

Hellfire - 8/4/04 at 03:23 PM

Those figures are deffo wrong... I just pulled this from t'internet and came up with these figures, which are the best ten petrol engined vehicle emissions available.

Emissions
Emissions

I'd check 'em...

spunky - 8/4/04 at 03:45 PM

Thanks for the replies,
Just checked the figures and thats what the letter from Honda states. Doesn't mean they are correct though.
Looking at the figures above I reckon they may have the decimal point in the wrong place.

Thats the japanese meticulous attention to detail that I like.....

matt_claydon - 8/4/04 at 05:28 PM

The figure on spunky's letter from Honda was for CO, the values in the table above and that DVLA use to set you tax band is CO2.

Matt.