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Old 11-25-2018, 01:12 PM   #31 (permalink)
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The way I understand it is: it is all about controlling NOx emissions. There are two schools of thought, the first is lots of egr to cool the charge. The problem with lots of egr is lots of soot, so you have to trap it and burn it with the cat and extra fuel. The second is not so much egr which makes more NOx but less soot, then kill the NOx with urea. I know International is having trouble meeting the new standards even with urea. I was told our new Internationals will come with Cummins engines because they can meet smog.

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Old 11-25-2018, 03:52 PM   #32 (permalink)
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Diesel is a heavier fuel, so it contains longer and more complex hydrocarbon molecules which, if partly burnt, form particles; soot, basically.
Gasoline molecules are smaller; once they break apart the remains are too volatile to create soot and will generally burn up too or form single CO molecules.

Plus what me_and_my_metro said.
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Old 11-26-2018, 12:15 PM   #33 (permalink)
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Quote:
Originally Posted by slowmover View Post
Anti-diesel ”reasearch” is pretty well bunk. Politically skewed.
NOx effects are pretty well documented

Local research into diesel soot particles resulted in a bit of a surprise:
If a participant had been stuck in traffic, it already showed ...
They end up in your blood and go everywhere your blood takes them ...


Quote:
The energetic content of diesel makes it indisposable. Non-replaceable.
Diesel is dead-easy to replace
There's more energy in natural gas by weight
In HGV, up to some 70% diesel can be replaced by CNG - even retrofitted


I burn less CNG than I'd burn diesel
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Old 11-26-2018, 04:37 PM   #34 (permalink)
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My diesel makes huge 100 to 250 micron particles.
With newer diesels they try to hide the particle matter and you end up with a lot of 1 to 3 micron diesel particles. It just so happens that is also the perfect size for bugs to be packaged in a biological weapon system.
Because when inhaled it goes everywhere throughout the body.
100+ micron is like common dirt and dust, the body's defences filter it out.
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Old 11-26-2018, 09:05 PM   #35 (permalink)
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Quote:
Originally Posted by me and my metro View Post
The way I understand it is: it is all about controlling NOx emissions. There are two schools of thought, the first is lots of egr to cool the charge. The problem with lots of egr is lots of soot, so you have to trap it and burn it with the cat and extra fuel. The second is not so much egr which makes more NOx but less soot, then kill the NOx with urea. I know International is having trouble meeting the new standards even with urea. I was told our new Internationals will come with Cummins engines because they can meet smog.
Water + alcohol injection, or eventually CNG fumigation, might make more sense. BTW most of the urea used for DEF production is made out of natural gas, so why not to use CNG directly instead? Either as the primary fuel or integrated with Diesel. A trucking company from Brazil has tested an Euro-3 rated Mercedes-Benz Atego with a dual-fuel setup that could operate with up to 95% CNG, and its emissions were comparable to an Euro-5 rated truck even though it didn't have SCR and DPF.
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Old 11-28-2018, 10:07 AM   #36 (permalink)
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In Texas they are installing cng infrastructure mostly for big rig trucks but anyone can use it.
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Old 11-10-2022, 02:01 AM   #37 (permalink)
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The first dedicated-CNG coach operating commercially in my hometown since May 2021, with a 320hp, 5-cyl 9.3L Scania engine. It's used for a charter service between Porto Alegre and Charqueadas. This year for the first time both Diesel fuel and CNG became more expensive than regular gasoline in Brazil, but some operators may favor CNG and biomethane over Diesel as there is no need for a complex aftertreatment system.

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