And, before you start talking about how the Toyobaru's precious weight distribution could be seriously compromised by the normally heavier diesel engine when compared to the same displacement turbocharged petrol engine just hold your horses...
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The main configuration of the new engine is based on the conventional boxer diesel.
The benefit of the boxer engine is that it enables a compact, lightweight and highly rigid design compared with an inline four-cylinder unit. It also offers excellent NVH behavior, engine performance, and fuel economy. To extend the stroke, but keep the overall width of the engine equivalent to that of a four-cylinder boxer petrol engine, the boxer diesel employs a diagonally split connecting rod and a different method of assembly. This has minimized the increase in the cylinder block deck height.
Furthermore, the piston height is kept compact by employing high-strength aluminum alloy pistons. The cylinder head comprises four valves and center injection. Employing proprietary fuel spray injectors with short overall length, the cylinder-head height is lower than in the boxer petrol, successfully maintaining the engine overall width equivalent to that of the petrol.
In general, diesel engines are much heavier than their petrol counterparts. To minimize the increase in weight, the overall length of the boxer diesel engine is shorter than that of the boxer petrol. The bore pitch was shortened by 14.6mm compared with the boxer petrol, giving an overall length of 353.5mm, which is 61.3mm shorter than the boxer petrol. In total, the boxer diesel achieved a weight reduction of 10kg compared with a typical 2-liter four-cylinder diesel powertrain, through the compactness of short overall length and width, combined with the balancer shaft-less structure coming from the good noise and vibration characteristics and the weight reduction of various parts.
The turbocharger is of a variable nozzle type, which controls the vane opening around the exhaust turbine according to the operating range, giving highly efficient supercharging in all ranges. The turbocharger is located under the engine to ensure good exhaust gas conversion and give a low center of gravity.The characteristic dynamic performance of the Subaru is realized through the lowered center of gravity and enhanced supercharging response. The oxidation catalyst and the DPF are located directly downstream of the turbocharger. This layout enables the catalyst to warm up more quickly, securing the exhaust gas conversion performance in a wide operating range.
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350 Nm equates to the same 258 lb-ft of torque from the Volkswagen Bluesport engine.
Under the hood of Subaru's 2nd generation Boxer Diesel