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this post was submitted on 21 Nov 2024
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The antipollution on a diesel engine (at least a big one) essentially reroutes the exhaust back through the engine and reburns it again. Before the antipollution devices were in place it wasn't uncommon for big diesels to get 500,000 miles before they needed to be replaced. Now with the antipollution devices they're getting somewhere in the neighborhood of 100k before they start having problems of significance.
Those engines and their maintenance are expensive as hell. It saves a whole lot more than the $4,500 having that done. It saves them hundreds of thousands of dollars over the long haul.
I actually decided to search this because I thought the whole point of DEF was so trucks wouldn't need to use an EGR like every car does.
Apparently emissions is complicated and expensive lol, so lots of trucks have both.
Newer models however have started creating systems that remove the EGR and instead rely solely on the SCR with a bigger DEF tank and a cleanup catalyst.
I think DEF is still the right direction. Exhaust recycling has a ton of downsides that took car OEMs a while to hack their way around (or give up and plan for 150k mile expectancy).
4,500 for a mod though is still pretty expensive for something you can do yourself. Most of that cost was probably due to it being illegal, not because it's hard to accomplish.
Are you defending this?
God I hate comments like this, that are so un charitable. He's giving us more information and context which is important and adds to discussion and here you are trying to start shit.
This happens way too often on here, people providing nuance or a different perspective and some douche sliding in "so you think everyone should DIE?!!!!" putting words into OP's mouth and attributing malice.....
A point was trying to be made. One - the information provided is absolutely biased and possibly untrue. Performing maintenance on your vehicle is a fact of life. Using emissions as a scapegoat and justification to pollute bothers me more than my comment bothers you.
Fuck polluters and fuck their apologists.
Everything is on a scale. The pollution control equipment only trades air pollution for increased throughout in landfills, increased industrial emissions to the air, water, and land by necessitating more frequent replacements, as well as more funds in the pockets of capitalists. Pick your poison because you're never going to come away squeaky clean.
Explanation is not excuse.
or they could run on propane, which doesn't make a whole lot of particulates in the first place and is cheaper anyway
I’m assuming the engine would need some modification to run propane? If not to the cylinders themselves, to the fuel supply? I assume propane would be largely similar to LNG vehicles? I really only see that on city buses and assumed there was a range reason for that.
Propane is way less energy dense per volume than diesel, so it isn't feasible for long-haul trucking. CNG/LNG is more energy dense than propane, but still nowhere near that of diesel fuel, which is why you see it in busses and garbage trucks. I know a few massive fleets (UPS comes to mind) that use CNG for some of their local routes, but that is probably more for the "green" optics than anything else.
propane is like 3/4 density of petrol and gram per gram carries more energy (propane 0.58g/ml, petrol 0.7ish g/ml) it's slightly greener because it contains more hydrogen so more energy per carbon emissions
LNG is cryogenic, has even lower density (0.41 to 0.5 g/ml depending on temperature) and CNG is less dense still depending on pressure
petrol engines need little modification, what is def necessary is another tank for LPG. different fuel supply system is required, but if original is kept in place either petrol or LPG can be used as needed. propane is a liquid under pressure and much denser than gaseous compressed methane, and not cryogenic like LNG. diesel engines can also be converted, but it gets harder and requires either small amount of normal diesel used or installation of spark plugs (it's still diesel cycle)
I'm talking big trucks not forklifts.
out there plenty of people run their cars on LPG, most of taxis in Warsaw are hybrids running on propane because it's cheapest fuel in most efficient vehicle in urban conditions
it's pretty common in US too, just not in private vehicles https://en.m.wikipedia.org/wiki/Autogas#/media/File:2020_Global_Autogas_Consumption.svg
I worked in the lumber business in the US for a while, and we didn't have access to LP fuel anywhere I knew of, and LP trucks for purchase were unheard of, and I can't imagine where I could even get one serviced. It's an LP desert where I am
Just my personal experience.
I heard some of that is popular along southern border (AZ?)
IIRC from /r/Europe discussion, propane is also not uncommon as a fuel in Turkey.
kagis
Yeah:
https://auto-gas.net/mediaroom/turkey-leads-autogas-consumption-in-europe/