Waterloo, IA - John Deere Power Systems (JDPS) has announced a new naming convention and ratings for its Interim Tier 4/Stage III B engines. The names will capitalize on the PowerTech brand but add a three-letter suffix that designates the engine's technology package. An example of the new names is the PowerTech PVX 6.8L. The new ratings for the John Deere Interim Tier 4/Stage III B lineup will apply to the five models in the 130 kW (174 hp) and above power class.

The three letters define the engine's technology platform, turbocharger and exhaust filter. All of the John Deere Interim Tier 4/Stage III B engines with ratings 130 kW (174 hp) and above are designated "P," indicating the Tier 3/Stage III A PowerTech Plus technology platform that features 4-valve cylinder heads, cooled exhaust gas recirculation, full-authority electronic engine controls, high-pressure fuel systems and air-to-air aftercooling. These engines use either a variable geometry turbocharger (designated "V") or series turbochargers (designated "S"), and they also feature an exhaust filter (designated "X").

"The versatility of this naming convention enables us to use it for Interim Tier 4/Stage III B and future emissions regulations," said Doug Laudick, manager of product planning.

The engine models and ratings 130 kW (174 hp) and abovefor the John Deere Interim Tier 4/Stage III B lineup include:

• PowerTech PVX 6.8L: 130 kW – 187 kW (174 hp – 250 hp)
• PowerTech PSX 6.8L: 168 kW – 187 kW (225 hp – 250 hp)
• PowerTech PVX 9.0L: 187 kW – 224 kW (250 hp – 300 hp)
• PowerTech PSX 9.0L: 224 kW – 317 kW (300 hp – 425 hp)
• PowerTech PSX 13.5L: 261 kW – 448 kW (350 hp – 600 hp)

The primary difference between the PowerTech PVX and PSX engine models is the variable geometry turbocharger (VGT) versus series turbochargers, consisting of a VGT and a fixed-geometry turbocharger. The 13.5L model is available only with series turbochargers. The PowerTech PVX engine models deliver similar power, transient response, peak torque and fuel economy as the Tier 3/Stage III A engine models they replace. The same performance benefits are extended to the PowerTech PSX engine models, which also provide improved low-speed torque and enhanced high-altitude operation.