25 October 2011
Kohler® Engines, along with Italy-based Lombardini, a KOHLER® Company, unveiled today two new Tier 4 heavy-duty diesel engines for the industrial, constructions and agricultural markets. The KOHLER® 1.9 liter KDI1903TCR and the 2.5 liter KDI2504TCR engines meet the Tier 4 final emission standards without the use of a diesel particulate filter (DPF).
The new direct injection engines utilize a common rail injection system with a maximum pressure of 200 MPa and multiple injection capability, cooled exhaust gas recirculation (EGR) and a diesel oxidation catalyst (DOC). Both engines are electronically controlled. “The lack of a DPF is a real breakthrough for engines at these displacements, and the technology systems built into the engines by Kohler and Lombardini are what makes them truly innovative at this power range,” said Kohler.
Kohler’s 1.9 L KDI1903TCR model has 42 kW (56 hp) of power at 2600 rpm and 225 Nm (166 ft-lb) of torque at 1500 rpm. The 2.5 L KDI2504TCR delivers 55 kW (74.3 hp) of power at 2600 rpm and 300 Nm (221.3 ft-lb) of torque at 1500 rpm. Tier 4 final standards for this power category become effective from 2013.
Compared with indirect injection diesel engines (still used in this engine category) with diesel particulate filters, the new DI engines offer equipment owners the ability to save up to $1,400 on fuel and $116 on oil per year, according to Kohler. This estimate is based on 1,000 hours of annual operation at $3.75 per gallon of diesel fuel and $4.10 per quart of oil.
These new Kohler engines are another example of complying with the US EPA Tier 4 final emission standards without a DPF. While the engines may comply with the letter of the regulation, this emission strategy runs contrary to the intention of the US EPA who designed the Tier 4 emission standards to force diesel particulate filters on nonroad engines.
To complete the new engine series, Kohler has also developed mechanical injection versions for markets where Tier 4 emissions are not required. The new diesel engines will be manufactured in Reggio Emilia, Italy.