Peterbilt Motors Co. has announced the availability of the Cummins B6.7N natural gas engine in its new medium duty Models 536 and 537. The Peterbilt Model 536 with the B6.7N engine sports 200-240 HP and 520-560 lb-ft torque available while emitting 50% lower NOx emissions than current EPA standards, the OEM noted. The non-CDL Class 6 Model 536 is designed to provide drivers performance with a low cab entry height, improved visibility, low NVH and room for three people within the 2.1-meter-wide cab. Critical information is relayed to drivers through a 7-in. digital display located in the instrument cluster and featuring a digital card system fully integrated with the latest Peterbilt safety systems.
In 2007, Peterbilt introduced natural gas engines into the lineup as an option on the Model 320 and has continued to incorporate natural gas engines into the Peterbilt lineup. Today, three natural gas engine platforms are available in several Peterbilt truck models.  Medium duty trucks can be configured with the just introduced B6.7N and the L9N featuring 300-320 HP and 860-1,000 lb-ft torque. Heavy duty trucks including the Model 520, Model 567 and Model 579 can be outfitted with the ISX12N featuring 400 HP and 1,450 lb-ft of torque.
