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Originally Posted by JayG
The thing is, a lot of race cars run much more efficiently and would pass the clean air requirements
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True and false.
This is the big issue about race cars and even the recent diesel gate. The most efficient engines are not emission friendly. Yes they burn all the fuel and turn it into power. The problem is inner cylinder pressure and high temperatures create NOx's. That is where the "polution" from diesel gate comes from. If you are not allowed high temps with a diesel engine you can't burn enough fuel per cycle to make power.
Another thing, efficiency is only a comparative value. A 4.0L engine can be more efficient then a 3.0L at burning its fuel and be low on emissions.But the 4.0L might be making 80hp/L while the 3.0L is making 100hp/L, making the 3.0L more efficient power source for it size.
Here is why we don't want NOx. Remember its really easy to pollute 40x the limit when the limit is in the single digits. Medias are terrible at conveying this obviously.
From:
https://en.wikipedia.org/wiki/NOx
Quote:
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When NOx and volatile organic compounds (VOCs) react in the presence of sunlight, they form photochemical smog, a significant form of air pollution, especially in the summer. Children, people with lung diseases such as asthma, and people who work or exercise outside are particularly susceptible to adverse effects of smog such as damage to lung tissue and reduction in lung function.[5]
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