Perkins' New Tier 4 Final Engines Will Not Use DPF

Perkins' new range of Tier 4 Final/Stage IV engines, unveiled at INTERMAT, will use an aftertreatment system that does not require DPF.

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Perkins unveiled its new range of four cylinder Tier 4 Final/Stage IV compliant engines at INTERMAT 2012. Designed to achieve and deliver the performance required by OEMs while meeting the forthcoming legislative requirements, the new models all incorporate Perkins' specially optimized Selective Catalytic Reduction (SCR) technology.

The 1204F, 4.4 liter, 4-cylinder aftercooled engine is offered in a choice of two versions. The single turbo aftercooled 1204F-E44TA, produces 110 kW (147 hp), delivering improved fuel economy while offering great power and torque. While the twin turbo, aftercooled model – the 1204F-E44TTA – has powers up to 130 kW (175 hp) and employs twin turbochargers mounted in series, for extra power density, low speed torque and faster transient response.

Mindful of OEM requirements when considering machine design and application, Perkins has focused on minimizing the cost of transitioning machines from Tier 4 Interim/Stage IIIB to the latest regulations. By maintaining a high carry over of components from the previous Tier/Stage, keeping similar cooling packages and retaining compact dimensions for the engine envelope, Perkins has reduced the need for OEMs to undergo costly machine redesign.

Both 1204F models use aftertreatment comprising DOC/SCR modules. This compact solution not only achieves the significant reduction of NOx as required by the legislation, it also removes the need for any regeneration strategy for soot, since the formulation of particulate emissions is prevented in the combustion process.

The small size of the DOC/SCR module means it can be mounted in a variety of remote locations, freeing up valuable space in the engine bay, especially in more compact equipment.

Perkins does also offer the option of a service-free DPF aftertreatment unit to meet specific OEM requirements.

For OEMs and end users the arrival of the 1204F range promises many benefits from ease of integration and flexibility to increased productivity and a lifetime of low cost. Many of the improvements made at Tier 4 Interim/Stage IIIB have been carried over into the new range such as improved power density, improved transient response and competitive fluid consumption.

For engines from 3.4 to 7.1 liters Perkins has tailored SRC systems that maximize customer benefits.

Daniel Clayton, Perkins Tier 4 product marketing manager, concludes: “We have used the arrival of SCR technology to our customers’ advantage. By offering a no DPF option we have given them unrivalled flexibility as to how they wish to configure their machines. What is certain is that machine performance will in no way be compromised.”