Toyota KR engine

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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.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.

1KR-FE[edit]

1KR-FE used in Daihatsu Sirion, Toyota Aygo, Citroën C1 and Peugeot 107

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 CO
2
levels of 109 g/km, but current applications meet European emission standard EU5 and can have CO
2
levels as low as 99 g/km.[1] This engine has been given the 2007, 2008, 2009 and 2010[2] International Engine of the Year awards in the sub-1.0 liter category.

Applications:

1KR-DE[edit]

The 1KR-DE is the non VVT-i variant of the 1KR engine. It produces less power and torque than 1KR-FE. Output is 65 PS (48 kW) at 6000rpm and 85 N·m (63 lb·ft) of torque at 3600rpm. Bore is 71 mm and stroke is 84 mm, while the engine displacement is 1.0 L (989 cc).[3]

The 1KR-DE was specially designed for the Indonesian LCGC (Low Cost Green Car) market to reduce cost. The engine cylinder head cover is made from plastic-resin instead of aluminium to save 10 kg of weight. The exhaust manifold is integrated to the cylinder head together with the catalytic converter and oxygen sensor to save even more weight.[4]

Applications:

See also[edit]

References[edit]

  1. ^ "PEUGEOT 107: green cars with CO2 emissions under 120g/km". TheGreenCarWebsite. Retrieved 2014-02-12. 
  2. ^ Abuelsamid, Sam (2010-06-24). "International Engine of the Year Photo Gallery". Autoblog. Retrieved 2014-02-12. 
  3. ^ Zulkifli, BJ (2012-09-21). "Dismantling Secret Toyota Agya and Daihatsu Ayla (2)" [Membongkar Rahasia Astra-Toyota Agya dan Astra-Daihatsu Ayla (2)]. Kompas.com (in Indonesian). Retrieved 2014-03-04. 
  4. ^ "7 Agya Engineering Excellence - Ayla" [7 Keunggulan Mesin Agya - Ayla]. Otosia.com (in Indonesian). 2012-09-24. Retrieved 2014-03-04.