Posted by David G on September 27, 2015 at 10:41:48 from (63.152.64.213):
In Reply to: OT Discussion on VW posted by David G on September 27, 2015 at 08:38:32:
NOx, which is comprised of NO and NO2, is a product of high combustion temperatures. It was not an issue until the 60s saw high compression. They reduced it in the 70s with lower compression and EGR. The computer came along in the 80s, so it helped allow the compression to come back up, and so the mileage/performance did also. I do not think that Diesels had to comply with NOx emissions until about the last ten years. We saw performance/mileage decrease until the advent of DEF, which allowed higher efficiencies because the NOx was knocked down in a catalytic converter instead of doing it in the combustion chamber. I have had DEF in my latest truck, which is 5 years old, and 120K, zero issues with it.
I am not aware of which engines have DEF and which do not, so assuming VW did not to cut costs, also not familiar with the years of the issue. It is NOT fair to the owners to detune the engines now and have them live without compensation for it, but class actions only make the lawyers rich, what a mess.
I bet someone here knows the answer on DEF and the years it was used.
My industrial customers also have to conform to NOx emmisions on generation, burners and boilers. Some are using EGR, some are using DEF. I am seeing more EGR right now, because natural gas is so cheap, but I bet that would change if the price of fuel comes up.
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