RE: What is AdBlue? PH Explains
Discussion
gregpot2000 said:
The Adblue filler is just next to the fuel filler in my A4.
I just filled up mine yesterday, I used the truck pumps at a service station, so it really was as easy as filling with fuel. Only 95p a litre as well so 10quid to fill from nearly empty
Does it cut out when the tank is full in the same way a petrol/diesel pump will ? I just filled up mine yesterday, I used the truck pumps at a service station, so it really was as easy as filling with fuel. Only 95p a litre as well so 10quid to fill from nearly empty
Jag_NE said:
Patrick595 said:
Can you fill any adblue fitted cars with say Halfords adblue or is it manufacturer specific, e.g. Can you put Halfords adblue into say Range Rovers or Jagiars ?
Its not manufacturer specific. Johnnytheboy said:
Doesn't actually say what AdBlue is though, does it.
This article is taking the piss
I read: "DEF (AdBlue) is formed of 32.5 per cent synthetic urea and 67.5 per cent deionised water." It explains that it acts as a reducing agent in the catalytic converter to break down the NOx gas from the engine exhaust. Did you actually read the article?This article is taking the piss
I work with the stuff a fair so have some experience. All Adblue or DEF is the same spec as long as it conforms to ISO22241-1. It's concentration is important for the catalyst so don't think you can get away with topping it up with deionised water! Oems have many ways of monitoring DEF quality.
Also the temperature has to monitored carefully as it doesn't work properly, and if the temperature goes above 70 degrees it denatures and is useless. It can stand temps upto about 35C but the life is considerabley reduced, shelf life goes from 18 months to 6 months. HGV and buses have heated lines to ensure it is delivered the dosing valve at the right temperature usually because the exhaust is some distance from the dosing pump.
It is corrosive to aluminium and brass, so if you spill any around your engine you must rinse it away with water, obviously depending on where the filler is.
On the note of filling the tank, I wouldn't try squeezing as much as you can into a tank like you do with fuel, DEF expands when hot, as it will be returned to the tank at around 40 degrees and if the tank has a poor design with not enough expansion room (seen a few) it will start pressurising the tank and pee out somewhere.
Sounds really uninteresting now I read it back
Also the temperature has to monitored carefully as it doesn't work properly, and if the temperature goes above 70 degrees it denatures and is useless. It can stand temps upto about 35C but the life is considerabley reduced, shelf life goes from 18 months to 6 months. HGV and buses have heated lines to ensure it is delivered the dosing valve at the right temperature usually because the exhaust is some distance from the dosing pump.
It is corrosive to aluminium and brass, so if you spill any around your engine you must rinse it away with water, obviously depending on where the filler is.
On the note of filling the tank, I wouldn't try squeezing as much as you can into a tank like you do with fuel, DEF expands when hot, as it will be returned to the tank at around 40 degrees and if the tank has a poor design with not enough expansion room (seen a few) it will start pressurising the tank and pee out somewhere.
Sounds really uninteresting now I read it back
Picked up 7 litres from asda for a fiver the other day.
Had my cactus for 14,000 miles now and not had to top it up yet so thought it must be due soon.
I do a lot of motorway journeys at 60mph so guess it's not used as much as if I was doing a lot of town driving or fast motorway driving.
Had my cactus for 14,000 miles now and not had to top it up yet so thought it must be due soon.
I do a lot of motorway journeys at 60mph so guess it's not used as much as if I was doing a lot of town driving or fast motorway driving.
The harder you drive the more UREA will be consumed since NOxflow is increased, in general..
the SCR systems do look simple, but the control and monitoring of the system can be super complex to get it to work at the optimum all the time. This is really a thing separating some manufcaturers from others, it really takes alot of knowledge, testing and simulation to understand it. I worked for years on HD engine develpment and the NOx conversion rates you can achieve on a high performance SCR system is completely nuts!
the SCR systems do look simple, but the control and monitoring of the system can be super complex to get it to work at the optimum all the time. This is really a thing separating some manufcaturers from others, it really takes alot of knowledge, testing and simulation to understand it. I worked for years on HD engine develpment and the NOx conversion rates you can achieve on a high performance SCR system is completely nuts!
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