NAVISTAR BATTLES SCR
Fascinating fight going on in the heavy truck industry. Navistar, the big truck and diesel engine maker, is getting killed in the class-eight segment for semis. That’s because it bet on exhaust gas recirculation, or EGR, to control diesel exhaust emissions. Everyone else bet on selective catalyst reduction, or SCR, which uses urea. And that’s what truckers are buying because it’s cheaper than EGR. But Navistar accuses truckers of filling their urea tanks with water instead of urea to get around those controls. Urea costs anywhere from $3 to $5 a gallon. Bloomberg reports the EPA is going to issue new guidelines on truck emissions that could help Navistar. But right now the company is losing market share to Volvo and Freightliner which use urea to control emissions.
Truckers have to piss just like the rest of us, right? Why not fit the trucks with a funnel on the end of a hose up in the cab that empties into the urea reservoir?
Truckers say: "Pith on it!"
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Truckers say: "Pith on it!"
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Re: Truckers say: "Pith on it!"
Good idea, they'd like that better than a piss jug!
How expensive can EGR possibly be vs. SCR? I don't know how big truck diesel EGR differs from consumer gasoline EGR but I know that consumer gasoline EGR is not a hugely complex, high-tech, or expensive system.
How expensive can EGR possibly be vs. SCR? I don't know how big truck diesel EGR differs from consumer gasoline EGR but I know that consumer gasoline EGR is not a hugely complex, high-tech, or expensive system.
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watkins wrote:Humans have rear-biased AWD. Cows have 4WD
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Re: Truckers say: "Pith on it!"
I don't know fur shur, but from the article it appears that using EGR is more expensive for the manufacturer, but adds no recurring costs to the vehicle owner, like the urea-based SCR technology does.
Navistar is losing sales due to their higher costs and is now accusing the truckers of not refilling their reservoirs with urea, which would negate the SCR emissions control strategy.
Will the EPA require manufacturers that rely on SCR emissions technology to install sensors that would shut down the engines if urea was not present in the tank?
Navistar is losing sales due to their higher costs and is now accusing the truckers of not refilling their reservoirs with urea, which would negate the SCR emissions control strategy.
Will the EPA require manufacturers that rely on SCR emissions technology to install sensors that would shut down the engines if urea was not present in the tank?
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Re: Truckers say: "Pith on it!"
That's the impression that I get too, but the entire EGR system in a $20,000 car costs a few hundred bucks...on a $100,000 truck how much does it cost?
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watkins wrote:Humans have rear-biased AWD. Cows have 4WD
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Re: Truckers say: "Pith on it!"
i know the urea used in diesel applications is water based, but is there any chance you could damage your exhaust system using water instead of urea?
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Re: Truckers say: "Pith on it!"
Water is a major by-product of combustion, so there is tons of it passing thru the exhaust system already. I'd be more interested in how you keep the water in the urea reservoir from freezing in cold weather...or how you keep urea from freezing in even colder weather. There were piss-sicles hanging from the urinal at camp this weekend!
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