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DEF

I don't know much,if anything. As I see it,there is a separate reservoir that holds the DEF. It gets injected into the exaust mamiflod to kill smoke.It's requied only in the newer tractors. Our old 'antiques' don't need it.Like I said,I don't know anything either. So someone will correct me....
 
That is NOT true.

DEF is used in conjunction with EGR to reduce NOx emmissions.

It does NOTHING for smoke/soot.
 
Due to the un-throttled airflow, high combustion temperatures, and lean burn diesel engines are really good at combining nitrogen and oxygen into NOx pollutants which in turn create smog. (This is unfortunate since these are the same characteristics that make diesel engines so efficient.) Diesel exhaust fluid is used to convert the NOx into harmless nitrogen and water vapor. This occurs within the "selective catalytic reduction" chamber in the exhaust system by injecting the DEF in once the system reaches a hot enough temperature. The system does work - the current diesel engines produce about 3% of the NOx pollutants as unregulated engines did 25 years ago.
 
DEF isn't always used with EGR and in fact is often used as a replacement for EGR. Both technologies work to reduce NOx pollutants but do it in very different ways. EGR works to reduce the amount of NOx coming out of the engine in the first place while DEF is used to clean up the exhaust after-the-fact in the tailpipe. The advantage of using DEF instead of EGR is that it typically results in improved engine efficiency.
 
The urea breaks down to create ammonia in the SCR chamber. This NH3 then reacts with the NOx to produce N2 and H2O. The nitrogen in the urea is just sort of along for the ride.
 
You've got that right! And the bashing is typically by people who don't understand how the system works and/or who are choosing to ignore the benefits.
 
Exactly! I can remember when we started putting erg on test engines. All bad memory's! I got to plumb in the first urea system using a 55 gal drum, now we have 10000gal on hand and depending on testing we can use 5000 gallon a week.
 
David ..... it's only green BS if you refuse to try to understand it .... or cannot understand it. Once you do though, it is simple fact and no longer BS of any color .... ha!
 
If You like not filling the fuel tank every few minutes... Avoid the DEF Engines!

I bought a 2017 Nissan Titan XD (5.0 Cummings Diesel). When the regeneration cycle begins, or DEF fluid begins pumping.
The fuel mileage indicator drops like a rock! I will be getting 22, maybe 24 MPG, & all of the sudden I am getting 8 - 9
MPG, & sometimes will last for 45 minutes that way! I rarely get over 16 MPG on a 24 gallon tank of diesel. the DEF kicks
in at least once every tank of fuel. I have a Chev 2005 Duramax Dsl that gets up to 26/27 MPG on a full tank of 34 Gal.
I bought the cummings to replace the Chevrolet because none of the electronics are worth having; But I am spending A LOT MORE
MONEY ON FUEL, & NOW DEF FLUID! If I sell anything it will be the Nissan hands down.

& by the way Nissan quit making the cummings in December last year... I wonder why!!! It might also be that the engine wont
start at temperatures as high as 11 degrees above zero; when my Chev hasn't had a day it wouldn't start in 15 years!!!
 
The cost of DEF Fluid at Rural King Farm Stores is about $7 / 2.5 Gal.
Nissan Cummings 5.0 fuel usage goes up about 2.5 times while the DEF is running!
It takes up to about 1 - 1.5 gallon of diesel + 1/2 - 3/4 gal of DEF every time
it kicks on! By the way... Thats more Diesel I am not counting the engine still
getting its 23 MPG.
 
I never drove it rough, & rarely ever used to farm with.
If You set the cruise control for about 54 MPH, & dont hit stop lights, or stop signs +
dont use the brakes much. Let the engine, & transmission slow You down.
I Have gotten over 700 several times on 1 tank of fuel (during hot weather)
Also I dont take off fast. It might take 35 - 45 seconds to hit 54 MPH.
Get into a city full of stops, & You will be lucky with 18 MPG!
 
I really challenge your math.

700 miles on 34 gallons is 20.8 MPG.

My super duty is thirsty, but will beat 50MPG going down a hill.
 
(quoted from post at 11:29:59 03/21/20) If You like not filling the fuel tank every few minutes... Avoid the DEF Engines!

I bought a 2017 Nissan Titan XD (5.0 Cummings Diesel). When the regeneration cycle begins, or DEF fluid begins pumping.
The fuel mileage indicator drops like a rock! I will be getting 22, maybe 24 MPG, & all of the sudden I am getting 8 - 9
MPG, & sometimes will last for 45 minutes that way! I rarely get over 16 MPG on a 24 gallon tank of diesel. the DEF kicks
in at least once every tank of fuel. I have a Chev 2005 Duramax Dsl that gets up to 26/27 MPG on a full tank of 34 Gal.
I bought the cummings to replace the Chevrolet because none of the electronics are worth having; But I am spending A LOT MORE
MONEY ON FUEL, & NOW DEF FLUID! If I sell anything it will be the Nissan hands down.

& by the way Nissan quit making the cummings in December last year... I wonder why!!! It might also be that the engine wont
start at temperatures as high as 11 degrees above zero; when my Chev hasn't had a day it wouldn't start in 15 years!!!
Click to expand...

You're confused/misinformed. DEF doesn't "kick in" it's injected continuously.

You are talking about the DPF, dee PEE eff, diesel particulate filter, which "regens" when it fills with soot by injecting diesel fuel into the DPF to burn off the soot.

DEF increases fuel economy. DPF decreases fuel economy.

The reason Nissan stopped offering the Cummins, by the way, is because NOBODY BOUGHT IT. Sales were so poor it made no sense to continue selling them. The "big three" are so well entrenched in the American truck culture that it would take something truly revolutionary to make any inroads in the heavy duty pickup market, and an expensive "5/8 ton" pickup truck just wasn't going to do it.
 
(quoted from post at 12:02:42 03/21/20) I never drove it rough, & rarely ever used to farm with.
If You set the cruise control for about 54 MPH, & dont hit stop lights, or stop signs +
dont use the brakes much. Let the engine, & transmission slow You down.
I Have gotten over 700 several times on 1 tank of fuel (during hot weather)
Also I dont take off fast. It might take 35 - 45 seconds to hit 54 MPH.
Get into a city full of stops, & You will be lucky with 18 MPG!
Click to expand...

This is the reason you were having such frequent regens. You can't baby modern diesel trucks. Puttering around with them fills up the DPF. You need to slam your hand in the door when you get in, just like the old Detroit 2-strokes, and drive them ANGRY.
 
Regeneration has nothing to do with DEF! Regeneration cleans the particulate filter. And if don't let your truck idle a lot, it won't need to regenerate frequently. If you're one of those guys who leaves their truck idling in the parking lot when they go to the grocery store, expect to regenerate a lot.

By the way, it's "Cummins", not "Cummings". Check the badge on the side of that Nissan you purportedly own.
 
> 700 miles on 34 gallons is 20.8 MPG.

I always wonder how folks come up with their extraordinary mileage claims. And it seems the older the vehicle, the more ridiculous the claim. I often wonder if I grew up in a parallel universe where a gallon was really three quarts, since my old beaters never got the mileage other folks claim.
 
(quoted from post at 15:35:22 03/21/20) > 700 miles on 34 gallons is 20.8 MPG.

I always wonder how folks come up with their extraordinary mileage claims. And it seems the older the vehicle, the more ridiculous the claim. I often wonder if I grew up in a parallel universe where a gallon was really three quarts, since my old beaters never got the mileage other folks claim.
Click to expand...

I find it amazing that folks won't believe EPA mileage tests (which seem to have gotten fairly close to real-world results) and the tractor fuel consumption figures from the Nebraska Tests, but will readily believe some schmo who claims to get 30 or 40 percent better results than everyone else.
 
(quoted from post at 11:29:59 03/21/20) If You like not filling the fuel tank every few minutes... Avoid the DEF Engines!

I bought a 2017 Nissan Titan XD (5.0 Cummings Diesel). When the regeneration cycle begins, or DEF fluid begins pumping.
The fuel mileage indicator drops like a rock! I will be getting 22, maybe 24 MPG, & all of the sudden I am getting 8 - 9
MPG, & sometimes will last for 45 minutes that way! I rarely get over 16 MPG on a 24 gallon tank of diesel. the DEF kicks
in at least once every tank of fuel. I have a Chev 2005 Duramax Dsl that gets up to 26/27 MPG on a full tank of 34 Gal.
I bought the cummings to replace the Chevrolet because none of the electronics are worth having; But I am spending A LOT MORE
MONEY ON FUEL, & NOW DEF FLUID! If I sell anything it will be the Nissan hands down.

& by the way Nissan quit making the cummings in December last year... I wonder why!!! It might also be that the engine wont
start at temperatures as high as 11 degrees above zero; when my Chev hasn't had a day it wouldn't start in 15 years!!!
Click to expand...

Scott011, your problem is running those worthless cummings diesel powered trucks. Everybody knows that they are just worthless Chinese knockoffs of the well built and long lasting and economical Cummins diesels.
 
FWIW, my '17 Silverado 2500HD Duramax uses less than five gallons of DEF every 7500 mile oil change. I buy Peak "Blue DEF", which runs $25 for 5 gallons. (There are cheaper options.) So that works out to less than a penny a mile. (About 0.3 cents/mile.)
 
Yeah, when you putter around with them or try to "hyper-mile" them they go through DEF like it's going out of style, and regen the DPF every time you blink.

They're meant to WORK. If you're not going to put a load on them and drive them like an old Detroit 71 series at least sometimes, get a gas truck.
 
My thought is, they have to use the resources to make the def, make the card board box, the plastic container in the cardboard box, the lid for the plastic container, the funnel, the plastic the funnel is in, after all of this they have exceeded any pollutants they are trying to save. Then all of these things have to be disposed of. You can t store the def so most of the time it s a special trip to go buy some. All of these thing are creating emissions.
 
(quoted from post at 09:44:57 03/22/20) My thought is, they have to use the resources to make the def, make the card board box, the plastic container in the cardboard box, the lid for the plastic container, the funnel, the plastic the funnel is in, after all of this they have exceeded any pollutants they are trying to save. Then all of these things have to be disposed of. You can t store the def so most of the time it s a special trip to go buy some. All of these thing are creating emissions.
Click to expand...

flhr62, the shelf life for DEF is a year.
 
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