Toyota KR engine

The Toyota KR engine family is a straight-3 piston engine series, designed by Daihatsu, which is a subsidiary of Toyota. The 1KR series uses aluminium engine blocks and chain driven DOHC cylinder heads. It uses multi-point fuel injection, and has 4 valves per cylinder with VVT-i whilst some of the series do not have it.The engine is also exceptionally light with a 69 kg weight with all ancillaries. This is due to the nature of the applications and weight of city cars.

The 1KR-FE is a 1.0 L (996 cc) version built in Japan and Poland. Bore is 71 mm and stroke is 84 mm, with a compression ratio of 10.5:1. Output is 67 PS (49 kW) at 6000 rpm with 91 N·m (67 lb·ft) of torque at 4800 rpm or 71 PS (52 kW) at 6000 rpm with 94 N·m (69 lb·ft) of torque at 3600 rpm. When originally on sale it met European emission standard EU4 requirements and had CO₂ levels of 109 g/km, but current applications meet European emission standard EU5 and can have CO₂ levels as low as 99 g/km. This engine has been given the 2007, 2008, 2009 and 2010International Engine of the Year awards in the sub-1.0 liter category.

The engine was also adapted to meet European emission standard EU6 and can have CO₂ levels as low as 88/89 g/km in Toyota Aygo or Citroen C1/Peugeot 108 since 2014 in NEDC.

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