Urea Injection System - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 52 (permalink) Old 09-30-2009, 03:35 AM Thread Starter
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Question Urea Injection System

How exactly does this work and how often do you have to refill it? Anyone know if there are places to buy the fluid now? Any prices on this stuff?

( on edit, looks like I just found out how much it cost in another thread, $2.50 per gallon - seem right? ) Just trying to see if this truck will be cost effective...

Last edited by Jeremiah; 09-30-2009 at 03:46 AM.
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post #2 of 52 (permalink) Old 09-30-2009, 06:43 AM
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I think it holds like 5-7 gallons and has to be refilled once every like 5k miles. Spending a few bucks for every 1000 miles driven isn't a big deal to me?

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post #3 of 52 (permalink) Old 09-30-2009, 08:12 AM
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I know you can buy it from any Fleetguard dealer, they call it Diesel Exhaust Fluid. 1, 2.5 or 5 gallon jugs. I would think that should keep you going for a while. I'm interested to see how this set up works. Also if it would be any harder to tamper with?

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post #4 of 52 (permalink) Old 09-30-2009, 11:24 AM
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To understand how DEF works, you need to understand the idea behind SCR. SCR is a technology that uses a urea based diesel exhaust fluid (DEF) and a catalytic converter (just like the old days) to significantly reduce oxides of nitrogen (NOx) emissions. SCR stands for selective catalytic reduction.

The only purpose of the SCR system is to reduce levels of NOx being pushed out of your tailpipe. DEF is nothing more than a 32.5% w/w solution of urea. Urea is a chemical made in massive quantities for the fertilizer industry, but it is also made every day by each of you. We excrete about an ounce of the stuff (pure urea) every day in our urine. It is a by-product of cell metabolism, so if you sampled any part of your body, you would detect some urea.

Here is how it works. Small quantities of diesel exhaust fluid (DEF) are injected into the exhaust upstream of a catalyst, where it (the urea and water) vaporizes and decomposes to form ammonia and carbon dioxide (the water just goea along for the ride; the urea is the workhorse here). The ammonia (NH3) is the desired product which in conjunction to the SCR catalyst, converts the NOx to harmless nitrogen (N2) and water (H2O). Pretty cool, piss turns NOx into harmless stuff!

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post #5 of 52 (permalink) Old 09-30-2009, 11:26 AM
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Oh, if you can buy pure urea cheaply, you could make your own DEF. Just make a 32.5% solution, it is simple.

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post #6 of 52 (permalink) Old 09-30-2009, 03:12 PM
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One last thing....if the DEF is really just urea and water, then it is an EXCELLENT skin softener. I work in the dermatology field and we use 30-50% creams and lotions for thick skin. It is great in one of those sonic bath contraptions. You put a gallon in and heat it a little (like hot tub temp), and then immerse your feet for 20 min. It softens dry skin by bonding water. It also has some other interesting properties:

-antibacterial - it will kill bacteria rapidly on contact
-antifungal - it will kill this too, but if you have the fungus under your toe nails, it takes time.
-deoderant - if you have smelly feet, this will cure them if you soak regularly.

I know it sounds weird that a chemical you are using in your truck can be used medicinally, but it is totally true! Here is a link with more on urea:

http://health.centreforce.com/health/urea.html

and below is an excerpt from that.

Medical researchers have also proven that urea is one of the best and only medically proven, effective skin moisturisers in the world. In many years of laboratory studies, researchers discovered that, unlike just about all other types of oil-based moisturisers that simply sit on the top layers of the skin and do nothing to improve water retention within skin cells (which gives skin its elasticity and wrinkle-free appearance), urea actually increases the water-binding capacity of the skin by opening skin layers for hydrogen bonding, which then attracts moisture to dry skin cells.

Now, I'm not saying to go and use DEF for skin disorders.....but you could, and it would work! (assuming no other ingredients are in there but water and urea). My main point here is that DEF is a very natural product, not a dangerous chemical or something mysterious.

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post #7 of 52 (permalink) Old 09-30-2009, 03:16 PM
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Thanks Ralph, that's pretty damn interesting!

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post #8 of 52 (permalink) Old 09-30-2009, 03:31 PM
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post #9 of 52 (permalink) Old 09-30-2009, 04:17 PM Thread Starter
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Thanks Ralph, that's pretty damn interesting!
yes, i agree that really makes it seem better...:
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post #10 of 52 (permalink) Old 09-30-2009, 07:15 PM
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So what will prevent someone from just putting water in the tank? Are there sensors that can sedtect the % of urea in water? Also does this get rid of the DPF or are those still in play?

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