[azm1]

Interesting question. Depends how you working on it. If you are working on improving the efficiency then I would say its ok. If you are tampering with the actual values because your engines are bad to environment then yes, you are directly responsible. Are those workers who put the engine together responsible? Absolutely not. Unless they are aware of such shady actions.

[gambiting]

But a 6.0L V8 engine will always release more pollutants than a 1.0 3-cylinder engine. One could argue that unless you actively need so much power(drive a truck, tow caravans/boats/trailers), having a huge engine serves no purpose apart form personal pleasure, and it pollutes a lot. So with this logic in mind....is working on production of such engines morally wrong? If you are working for Mercedes and design their 6.3L V8 that goes into AMG63 cars, it that morally wrong?

[azm1]

If you would think of all humankind + planet as one entity, then you would deduce that it does not make sense to create such redundant engines because for you as a one cell it can be enjoyable and cool but for the cell next to you its actually damaging. So its a zero sum game. You should think of others and always ask yourself if your actions does not harm others or at least try to reduce the harm if possible. So yes, I would say the more power, the greater moral responsibility for the future of our species. For sure.

Once you are great mind and able to design modern engines for super cars then I would say you could do many other 'jobs' which would probably benefit us all more than making strong cars.

BTW I like fast cars myself. My conclusion is rather utopian. If you feel like you should do something more beneficial in position of such person who makes engines, maybe you could consider finding another job. But can you generalize that to all? Probably not..