Scania is deliberately turning its back on exhaust-gas recirculation and is increasingly relying on SCR-only. The test results support the Swedes´ decision.
Was it all a mistake? This is the question that many engine designers from the EGR faction are probably asking themselves. EGR stands for exhaust-gas recirculation and—in combination with SCR technology and particulate filters—was regarded as the ideal Euro 6 solution as recently as two or three years ago. The entire European commercial vehicle sector favored this technology for complying with the new regulation. The only holdouts were the Iveco engine designers in Arbon, Switzerland. They relied on increased use of SCR to dispense with EGR. This method has been named SCR-only since then.
Being very adventuresome with its engines anyway, Scania then introduced EGR-free five-cylinder engines and supplemented them in late 2013 with the first six-cylinder engine rated at 360 or 410 hp (265 or 302 kW). One year later, they were followed by a 450-hp (331-kW) version based on the existing EGR engine of the same power. The conversion to SCR-only did not affect the basic engine parameters. In both cases, the 130-mm bore and 160-mm stroke result in a displacement of 12.7 liters. The rated power, maximum torque and the associated revs also match.