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Why are most new cars blue?


Mook
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My Current insignia is an ecoflex - £30 a year tax and fuel economy is 10mpg worse than my last non - eco insignia.

So lets understand this - it emits less CO2s so it more environmentally friendly and attracts less tax, but it consumes 20% more fuel than my non eco version thus consuming more fossil fuels and destroyign the planet in a totally differnt way ..... Hmmm something flawed in this logic somewhere.

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I've said it before, but all the 'eco' crap manufacturers are forced to fit to cars these days is totally counter productive and actually makes cars less economical and less reliable, if they were allowed to get rid of all that and simply concentrate on lean burn technology, and develop their own methods of fuel saving, things would be a lot better.

Things like EGR systems and catalytic convertors prohibit the development of better alternatives.

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My Current insignia is an ecoflex - £30 a year tax and fuel economy is 10mpg worse than my last non - eco insignia.

So lets understand this - it emits less CO2s so it more environmentally friendly and attracts less tax, but it consumes 20% more fuel than my non eco version thus consuming more fossil fuels and destroyign the planet in a totally differnt way ..... Hmmm something flawed in this logic somewhere.

This is something I can never understand having been pushed down the green route with company cars. A few years back I had a 335i and a colleague had a Lexus rx450h. Both cars averaged around 28mpg with mainly motorway driving yet his car tax was a third cheaper due to low co2 emissions.

Now I am no chemist but if both cars use the same amount of fuel to travel the same distance they require then they both produce the same co2/km, no?????

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Now I am no chemist but if both cars use the same amount of fuel to travel the same distance they require then they both produce the same co2/km, no?????

Yes, I think so. The carbon comes from the fuel, so surely the CO2 and the fuel used must be in a 1:1 relationship?

However, the official CO2 figure comes from the official test which may or may not match what you actually do.

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I'm looking forward to getting a twin supercharged 3.0 V6 in 3 weeks. Which gives out 15% less CO2 than my 2.0T 4 cylinder. I bought it for eco reasons because I am always thinking of the environment.

I view all the city cars I see these days as free offset for whatever I want to drive.

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I don't think the two necessarily correlate, with EGR systems and catalytic converters trying to reduce C02 from the spent exhaust gasses.

EGR re-circulates the gases, but they have to come out at some point, surely, else the engine will inflate like a balloon? Don't catalysts take out noxious gases by ensuring they are fully oxidised, such as converting CO to CO2?

So if catalysts reduce CO2 from the exhaust, where is it going and what is it converted to? :confused:

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EGR re-circulates the gases, but they have to come out at some point, surely, else the engine will inflate like a balloon? Don't catalysts take out noxious gases by ensuring they are fully oxidised, such as converting CO to CO2?

So if catalysts reduce CO2 from the exhaust, where is it going and what is it converted to? :confused:

Water, nitrogen and oxygen basically.

The EGR recycles some of the exhaust gas back through the engine, meaning it gets burned again, so any left over unburned fuel in it gets used, meaning what comes out of the exhaust should theoretically be cleaner.

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Water, nitrogen and oxygen basically.

A catalyst converts CO2 to H2O, N2, and O2? Okaaayyyy.... :uhoh:

The EGR recycles some of the exhaust gas back through the engine, meaning it gets burned again, so any left over unburned fuel in it gets used, meaning what comes out of the exhaust should theoretically be cleaner.

That makes sense, but will have the effect of ensuring complete combustion of all HC content, oxidising it to H2O and CO2, thereby increasing the CO2 content in the resulting tailpipe emissions - albeit with a resulting decrease in HC emissions.

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A catalyst converts CO2 to H2O, N2, and O2? Okaaayyyy.... :uhoh:

Here you go-

In a catalytic converter, the catalyst (in the form of platinum and palladium) is coated onto a ceramic honeycomb or ceramic beads that are housed in a muffler-like package attached to the exhaust pipe. The catalyst helps to convert carbon monoxide into carbon dioxide. It converts the hydrocarbons into carbon dioxide and water. It also converts the nitrogen oxides back into nitrogen and oxygen.
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The catalyst helps to convert carbon monoxide into carbon dioxide. It converts the hydrocarbons into carbon dioxide and water. It also converts the nitrogen oxides back into nitrogen and oxygen.

Yep, so the catalyst converts CO to CO2, hydrocarbons to CO2 and H20, and oxides of nitrogen back down to N2. Result is less CO, less HC, less NOx, and more H20, N2 and CO2. All of which is a very good idea, of course. But the catalyst does not reduce the C02 content in the exhaust gases, in fact it will increase it slightly by eliminating the indisputably-harmful CO and HC emissions.

Edited by patently
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Two is better than one.

It's like the amps that go up to 11 in Spinal Tap because 11 is one higher than 10

But i'm not aware of any manufacturers that produce a car with two superchargers?

You see it on some of the top fuel dragsters, but it's an incredibly complicated set up, requiring a lot of custom bracketry.

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