Skyactiv D

Mazda also took a serious look at diesel combustion and, quite by chance, came up with the same optimal 14:1 compression ratio that worked for petrol engines.This technology yielded a very clean engine that complies with global exhaust gas regulations without the aid of nitrogen oxide aftertreatment systems.The engine is claimed to deliver 20 per cent better fuel economy with a smoother tial flame and thus helped to increase the average exhaust gas temperature to a level that would make the catalytic converter effective.

By running engines at compression ratios past 12:1 and mid- to high-load ignition timing afterTDC, Mazda engineers discovered that they were getting a greater increase in torque than could be expected from the increased compression ratio alone. It turned out that the high compression ratio caused the

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