Add Blue and Petrol

[colhonk]

Would using add blue clean up the exhaust emissions of a petrol engine?

 

[nht6030]

Would cut down emissions permanently, ad is basically water and urea,wouldn't be doing that anyway

 

[8100]

You would be ok with spark plugs out of a torpedo

 

[colhonk]

I meant by squirting it into the exhaust system.

 

[asdf]

No, Adblue is required used in a diesel engine as the exhaust conditions are still oxidising (far more oxygen present than is required to burn the fuel). This means there are no molecules present that can reduce NOx back to N2. The Urea is added to perform this function. In a petrol engine fuel and oxygen are very close the ratio required for complete combustion. This means that for every NOx molecule there will be a balanced incomplete combustion product such as carbon monoxide. These are reacted in the catalytic converter to give nitrogen gas and carbon dioxide so no adblue is required.

 

[DrDunc]

Adblue is used to reduce nitrogen monoxide gases (NOx) from exhaust emissions through selective catalytic reduction (scr).

NOx gases are believed to be far more harmful to the enviroment than carbon oxide gases.

Petrol cars emit far more CO2 than diesels, but far less NOx.

 

[Timbo]

Several Petrol engines, especially lean-burn direct injection ones, for instance VW FSI's use a NOx trap (abit like a DPF) where nox's are stored during high production - which is when they burn lean under cruise conditions usually. When there is a switch to a richer mixture say during acceleration, the trap releases and the nox's are reduced in a special section in the main cat. A diesel never runs rich, so has to use a different system.

 

[8100]

I meant by squirting it into the exhaust system.

I was not trying be sarcastic sir it twoze a failed attempt at comedy

 

[Cowabunga]

Several Petrol engines, especially lean-burn direct injection ones, for instance VW FSI's use a NOx trap (abit like a DPF) where nox's are stored during high production - which is when they burn lean under cruise conditions usually. When there is a switch to a richer mixture say during acceleration, the trap releases and the nox's are reduced in a special section in the main cat. A diesel never runs rich, so has to use a different system.

Many Euro6 [current] road diesel engines do actually use cooled EGR in combination with NOx storage traps as an alternative to SCR. I believe Honda and Renault have gone down this route, as opposed to Peugeot/Citroen and JLR who have gone SCR/Adblue

 

[colhonk]

Thanks for all the answers. Often wondered why cars did not use it and now I don`t have too anymore