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The Deere 4.5 liter turbocharged diesel engine is the first engine model in the 300 Series family to be updated with an evolutionary series of design improvements. Features include a new cylinder head for improved engine breathing, as well as significant improvements previously introduced on selected models in the current 300 Series engine family. This paper will highlight some of the component design changes that have resulted in improved performance, reduced heat rejection, improved gasketed joint integrity, and component standardization that provides increased engine value to the customer.

A naturally aspirated, direct injected diesel engine was used to evaluate the performance and emissions characteristics of a crude soybean oil, a 50 percent (by volume) mixture of crude soybean oil and #2 diesel fuel, and a degummed soybean oil. The data were compared with previous tests conducted on the same engine using #2 diesel fuel, crude sunflower oil and a 50 percent mixture of crude sunflower oil and #2 diesel fuel.

The performance and emissions characteristics of a direct injected, naturally aspirated diesel engine operating on 100 percent sunflower oil, 100 percent peanut oil and 50 percent (by volume) mixtures of either sunflower oil or peanut oil with #2 diesel fuel were compared to baseline results using #2 diesel fuel. Without recalibration of the rotary injection pump, the higher fuel densities and viscosities of peanut oil and sunflower oil caused fuel flow and energy delivery increases that yielded power and emissions increases. With the fuel flow adjusted to provide equal fuel energy input, engine power and thermal efficiency decreased slightly, while emissions increased slightly.