Mahindra has revealed to us that the company has adopted the Selective Catalytic Reduction (SCR) system for exhaust gas treatment for its 2.2 litre diesel engine in order to meet the new BS6 emissions regulations. This engine is used by the BS6 Scorpio and XUV500 while the new Thar should see it as well. News of the updated Alturas G4 with this system is also awaited.
The COVD-19 lockdown has definitely brought Mahindra’s manufacturing activities to a halt, like every other carmaker in India. But the company has been using this time efficiently to at least digitally update all of its models to BS6 specification. Of course, the road to BS6 was charted out much earlier by the industry and like everyone else, Mahindra too had been working to bring its BS6 models to market by April 1, 2020. While other car makers may have been quicker to launch BS6 models, especially with smaller petrol models, Mahindra seems to have been aiming straight for the April marker.
Regardless, almost all of its models are now BS6 ready and the company as mentioned above has been updating its model websites one after another. But considering that Mahindra is by and large a diesel UV maker, it got us wondering about which exhaust gas treatment system the company has incorporated for its various models, the Lean NOx Trap (LNT) system or the Selective Catalytic Reduction (SCR) system. And to start off with, we approached the subject of the impressive 2.2 litre mHawk diesel engine, which we love for its free revving nature and impressive performance.
Well, Mahindra has revealed to us that its 2.2 litre, four cylinder mHawk diesel engine has been fitted with an SCR exhaust gas treatment system to meet the tighter BS6 emissions regulations. The SCR system amongst other components including a DPF, uses AdBlue solution to douse the exhaust gases emitted by the engine within the exhaust system of the car and ahead of the catalytic converter to ensure cleaner tailpipe emissions. This system requires the AdBlue solution to be topped up every few thousand kilometers (depending on the size of an engine, vehicle and application).
The SCR system is generally considered to be more expensive than the LNT system, but the SCR system is the application of choice for large capacity diesel engines as only this system is effective enough for bigger diesel powertrains.