NAV can't afford to buy parts for prototype development?
Word on the street is that Nav engineers are worried about the company's financial condition because they are not allowed to obtain new parts to build and study prototypes of new engines.
A very odd business decision if it's true... seems like another decision that is destined to lead to failure of another engine design.
NAV owns MaxxForce which has extensive non US busnesses especially the Brazilian MWM business which is a polyglot of German MWM, KHD and Brazilian Ford products and operations. They build engines and vehicles for non US markets in South America, India and China.
Trying to develop prototype engines right now is throwing good money after bad. NAV is effectively 6 years behind their competitors from an engine development standpoint. Waiting another 6 months or so to see how their business shakes out is a smart move.
2014 fuel economy standards will be an interesting spanner in the works for NAV. Simply slapping an SCR system on the existing engine fixes their NOx issue but does little to improve their fuel economy. NAV isn't even close to out of the woods yet from an engineering standpoint.
Better to use resources to wring more performance out of existing engines than to develop new, at least in the short term.