With the US Environmental Protection Agency’s (EPA) Tier 4 Interim and European Stage IIIA off-highway emissions regulations approaching in January 2011, Cummins Inc. is at the forefront of efforts to meet stringent new standards for off-highway emissions with its new ‘G Drive’ series of engines.

The new breed of Cummins engines meets regulatory standards and is designed to deliver all its performance advantages without incurring higher operation costs.

Since the introduction of non-road Tier 1 regulations in 1996, the EPA has incrementally lowered the limits on emissions from diesel-powered, non-road equipment. Tier 4 regulations require diesel engine exhaust emissions that are significantly lower than previous tiers, says Cummins. For example, Tier 4 electric power products will produce approximately 93% less oxides of nitrogen (NOx) and 94% less particulate matter (PM) than Tier 1 products.

Cummins achieved Tier 4 Interim emissions levels by developing the engine combustion technology to work with the after-treatment filter in reducing PM emissions levels by 90%. The use of cooled exhaust gas recirculation (EGR) enables the required 45% reduction in NOx to be achieved.

Engine enhancements also include the use of Cummins Variable Geometry Turbochargers (VG Turbo), advanced electronic controls and high pressure common rail fuel systems. Common Tier 4 subsystem architecture will extend across the compliant portfolio. Cummins was able to build on the proven durability of the company’s Tier 3 engines and combine it with successful technologies to deliver the most dependable power solution.