Across a broad 55kW to 300kW output range, these engines will go beyond meeting Stage V near-zero emissions regulations to bring an increase in power and torque of up to 10%, Cummins claimed.
The Stage V enhancements to engine performance are being achieved by taking an innovative approach to combustion, air flow and fuel-injection systems, allowing Cummins to realise the full potential of the 4-cylinder QSF3.8 and QSB4.5, and the 6-cylinder QSB6.7 and QSL9, without the need to increase displacement.
Hugh Foden, executive director of Cummins' off-highway business, said: "Cummins is taking the opportunity offered by the introduction of Stage V regulations in 2019 to redefine engine performance in terms that our customers care about, with easier installation, simplified servicing and more responsive power delivery. In the process, we will be raising the engine performance bar higher for the industry."
The Stage V engines will be supplied as an integrated system with the Single Module exhaust after-treatment, newly developed by Cummins Emission Solutions in response to the needs of increasingly space-constrained equipment. According to Cummins, the Single Module will provide up to 50% reduction in envelope size and a 30% reduction in weight compared with the existing Stage IV and Tier 4 Final after-treatment systems.
The efficient packaging of the Single Module is achieved in conjunction with ultra-clean performance that removes 99% of particulate matter (PM) emissions, as well reducing oxides of nitrogen (NOx) emissions to low levels.
Cummins heavy-duty engine duo, the QSG12 powering equipment up to 382kW and the QSX15 with a 503kW top rating, are ready to meet Stage V regulations by retaining the diesel particulate filter and selective catalytic reduction (DPF-SCR) after-treatment system used for Stage IV and Tier 4 Final applications. For those larger, high-output machines, the Cummins DPF-SCR provides an established installation package with ongoing continuity for equipment manufacturers as they transition their machines to Stage V compliance in 2019, the company said.