Christophe wrote:pb2488 wrote:Is "k" just an opacity index?
How are CO2 emissions measured and are they related to opacity?
Ah, here's a "good" question from a detractor who improvises himself as a motorist and wants to give motor lessons to everyone! Such a question just betrays your ignorance of the engine ... and your willingness to deny the benefits of doping ...
My answer? Frankly, what can I say other than this:
Go back to school or buy motor books ...
Thank you for the advice, but the school, I went there a little and enough, I think, to manage to find (and keep, still today) a job in the sector using my acquired knowledge, this is not is not the case for everyone, I believe (In principle, the one to whom the community has paid for training that he has assimilated and if in addition he shows ingenuity, does not take long to be recruited, .. .in short).
And precisely, unlike others, I am not Mr. "I-know-everything-about-engines-and-engine-makers-are-incompetent-or-slow-or-plotters "So I ask myself a few questions and once again, on your part, the only answer is contempt but hey, I'm used to it. Those who do not agree with you must really have a hard time making themselves heard and must quickly become discouraged .... Anyway ... let's get back to the subject ...
I still listened to your advice and I inquired (the answer is not really different from what I thought):
... It should be noted that as far as pollution from diesel engines is concerned, for the moment, in France, very little importance is given to the chemical composition of the exhaust gases, but rather to the quantity of solid particles contained therein (mainly carbonaceous particles and soot).
In other words, the opacity of the exhaust gases is simply controlled by means of devices called opacimeters or fumimeters ...
http://www.motorlegend.com/entretien-reparation/fluide-lubrification-voiture/les-gaz-d-echappement/8,11764.html
The calculation method:
K = - ln (M1 / M2) / L
with:
L: effective length of the exhaust gas sample,
M1: light power emitted by the source,
M2: resulting power of light received by the detector.
http://www.dgemp.minefi.gouv.fr/metro/approb/decisions/97008520172.pdf
Regarding the opacity of the fumes, there are no chemical measurements of invisible compounds such as, for example, CO2 responsible in part for the effects of greenhouses.
But this question was rather a technical anecdote to better understand what opacity is, It does not call into question the results of the CT.
I do not want to deny the apparently very promising advantages of doping, it is rather the engine manufacturers, the states, the sncf, etc ..., who deny them and I find that more than strange, especially compared to their means and their interests.
The measurements made (consumption / pollution) are certainly true, but are they representative?
Cdlt