Navistar Points to CARB Research to Back Up Claims Against SCR

Navistar, the parent company of IC Bus, has taken its fight against selective catalyst reduction and for advanced exhaust gas recirculation as the right choice for meeting upcoming EPA 2010 emissions requirements in lowering nitrogen oxide (NOx) emissions at the tailpipe to no more than 0.2 grams. Currently, Navistar is suing the EPA in federal appeals court as it contends the feds by allowing SCR in its regulations will being increasing public health risks due to urea, the additive used in SCR to reduce NOx in the engine that has been used for the past two decades in Europe.

The aggressive marketing performed by Navistar this year has drawn criticism from many in automotive and fleet circles, such as Oliver Dixon's "Spiral of Dispair" article earlier this week on The World Trucks Blog at UK's www.roadtransport.com. But then, Navistar offered a rebuttal by claiming that a June letter penned by Bart Croes, chief of California Air Resources Board research, to the Health Effects Institute, a Boston nonprofit organization planning tests on 2010 engines, that said that the use of SCR represents a "large departure from conventional emission controls by introducing a liquid additive containing an organic form of nitrogen." According to MYETTNEWS.com, The letter goes on:

“Some toxic air contaminants that have been identified with SCR technology include hydrogen cyanide, cyanic acid, nitromethane, hydrazine, acrylonitrile, acrylamide, acetonitrile, and acetamide,” Croes wrote in his letter. “It is hoped that any exotic substances emitted from SCR technology will be at levels insignificant to exposure health effects.”

Although we are encouraged by findings to date, which suggest that the technology can deliver significant reductions of many species of toxicological relevance, this work has also documented the increase in some emissions such as some metals, nitrous oxide and nanoparticles.”

In the August issue of School Transportation News, contributor Bob Pudlewski writes that fleets must individually decide which technology best suits their needs, but either one has an increased price tag.

The debate rages on.

DIY: Build Your Own Plug-in Hybrid?

It might not give step-by-step instructions for retrofitting your school bus, but a new book purports to tell readers how they, too, can create their own plug-in hybrid electric vehicle like the like the 2010 Ford Fusion Hybrid or the 2010 Toyota Prius.

Perhaps those especially savvy readers can even hold onto the hope that they might eventually be eligible for the next round of federal grants for electric battery and hybrid drive train development. Well, OK, probably not, especially as GreenCarReports.com editor John Voelker gives it less than a stellar review of Build Your Own Plug-In Hybrid Electric Vehicle.

First of all, the book says it can help owners of hybrid vehicles convert them to PHEVs. The author is Seth Leitman, who last year coauthored an updated version of the classic Build Your Own Electric Vehicle. Voelker writes that the book is:

"...comprehensive but slightly disappointing. In part, that's because book publishing takes way too much time. The field of PHEVs is evolving so fast that you can only find truly up-to-date information online.

In particular, the book's list of conversion kits, sources, and background is now several months old. That's a lifetime for a technology whose members exchange information and collaborate to solve technical problems in online forums (eaa-phev is just one of many)."

The commercially-available hybrid diesel school bus currently on the market are from IC Bus, and Thomas Built Buses. IC Bus has both an PHEV and HEV, while Thomas has the latter. If this book review doesn't detract you, and you're the competitive entrepreneurial type, the book can be found on Amazon or in bookstores like Barnes & Noble.

UPDATE: A previous post made it sound like Thomas Built Buses was the only manufacturer with a hybrid school bus available to the market. We didn't mention IC Bus and its own plug-in and regular hybrid-electric models, which has been available the longest, since 2006, and currently has about few hundred in service nationwide. We regret the oversight, a big one.