Cummins unveils smallest Tier 4 Final engine

By Helen Wright16 April 2012

The Tier 4 Final / Stage IIIB QSF2.8 uses a Cummins Compact Catalyst to comply with the legislation.

The Tier 4 Final / Stage IIIB QSF2.8 uses a Cummins Compact Catalyst to comply with the legislation.

Engine manufacturer Cummins has used Intermat to launch its smallest electronically controlled Tier 4 Final engine - the 37 to 55 kW QSF2.8.

The 4 cylinder, 2.8 litre engine uses a high pressure common rail fuel system and a passive Cummins Compact Catalyst (CCC) aftertreatment system to meet the US Tier 4 Final and EU Stage IIIB emissions laws, which take effect for this power class from 2013.

Executive director of Cummins' off-highway business Hugh Foden said, "Simply by adding the CCC, we have developed an engine that fits with the existing Tier III envelope. Customers said they wanted the simplest possible aftertreatment system, and the catalyst is fully passive and is service free."

Cummins claims the CCC aftertreatment system allows for smaller, easier and more flexible equipment installation than diesel particulate filters (DPFs). DPFs are typically used by many other engines below 56 kW looking to meet the Tier 4 Final / Stage IIIB requirement for near-zero particulate matter emissions.

The new F Series engine will be manufactured at Cummins' new facility in Beijing, China.

Line-up showcased

The manufacturer also showcased a line-up of 56 kW to 503 kW (75 hp to 675 hp) US Tier 4 Final-compliant engines on its stand at Intermat.

Two other new engines on display ­- the 231kW QSB6.7 and the 503kW QSX15 - are said to produce fuel savings of up to 8% compared to Tier III models, and of up to 3% compared to the Stage IIIB and Tier 4 Interim models.

New technology including Selective Catalytic Reduction (SCR) aftertreatment has been added to these larger engines to meet the exhaust regulations.

Mr Foden said the company expected to record 25,000 hours of testing on its Tier 4 Final engines this year.

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