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 (152 lb) weight with all ancillaries. This is due to the nature of the applications and weight of city cars.

Toyota KR engine
The engine room of Toyota ROOMY CUSTOM G-T 2WD (DBA-M900A-AGBVJ).jpg
1KR-VET engine in the Toyota Roomy
Displacement1.0 L (998 cc)
Cylinder bore71 mm (2.8 in)
Piston stroke84 mm (3.31 in)
Block materialAluminium
Head materialAluminium
ValvetrainDOHC 4 valves x cyl. with VVT-i
TurbochargerOn 1KR-VET only
Fuel systemMulti-point fuel injection
Fuel typeGasoline
Cooling systemWater-cooled
Power output48–72 kW (64–97 bhp; 65–98 PS)
Torque output85–140 N⋅m (63–103 lb⋅ft)
Dry weight69 kg (152 lb)
PredecessorDaihatsu EJ engine
1SZ-FE (I4)


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

The 1KR-FE is a 1.0 L (998 cc) version built in Japan and Poland. Bore and stroke is 71 mm × 84 mm (2.80 in × 3.31 in), with a compression ratio of 10.5:1. Output is 67 PS (49 kW; 66 bhp) at 6000 rpm with 91 N⋅m (67 lb⋅ft) of torque at 4800 rpm - and a rev-limit of 6500 rpm - or 71 PS (52 kW; 70 bhp) 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
levels of 109 g/km, but current applications meet European emission standard EU5 and can have CO
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.

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



1KR-DE engine in the Wigo.

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; 64 bhp) at 6000 rpm and 85 N⋅m (63 lb⋅ft) of torque at 3600 rpm. Bore and stroke is 71 mm × 84 mm (2.80 in × 3.31 in), while the engine displacement is 1.0 L (998 cc).[3][4]

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 (22 lb) of weight. The exhaust manifold is integrated to the cylinder head together with the catalytic converter and oxygen sensor to save even more weight.[5]



The 1KR-DE2 is the more powerful variant of the 1KR-DE engine which is redesigned by Perodua. It produces 66 PS (49 kW; 65 bhp) at 6000 rpm and 90 N⋅m (66 lb⋅ft) of torque at 3600 rpm. Like the 1KR-DE, bore and stroke are at 71 mm × 84 mm (2.80 in × 3.31 in), respectively and engine displacement remains at 1.0 L (998 cc)[7][8] The 1KR-DE2 achieves Euro IV emission standard and it is very fuel efficient due to the ECO Mode, where the engine will exchange drop one cylinder for every two cycles, effectively achieving the economy of a 0.6 L (600 cc) engine, surpasses the 1KR-DE. The compression ratio for this engine is 11:1.[9]



1KR-VE engine on a Perodua Bezza

The 1KR-VE is a more powerful variant made by Perodua specifically improved version from the 1KR-DE2 which is made for the newest edition in the Perodua family. New 1.0-litre VVT-i engine is lighter & compact for better fuel consumption, better performance, reduced vibration & noise level. It was specifically made for the 1.0-litre variant for Perodua's first solely in-house manufactured car which is the Perodua Bezza. It is a modified and refined version of the 1KR-DE2 engine from the Perodua Axia. The new 1KR-VE engine produces 68 PS (50 kW; 67 bhp) at 6,000 rpm and 91 N⋅m (67 lb⋅ft) at 4,400 rpm, offering a mild 1 hp (0.75 kW) and 1 N⋅m (0.74 lb⋅ft) increase over the Axia's 1KR-DE2 plant. Perodua claims ECE fuel consumption figures of 22.8 km/L (64 mpg‑imp; 54 mpg‑US) for the manual variant and 21.3 km/L (60 mpg‑imp; 50 mpg‑US) with the automatic, both exhibiting a 1.2 km/L (3.4 mpg‑imp; 2.8 mpg‑US) improvement over the old 1KR-DE2. The new 1KR-VE engine now features variable-valve timing with intelligence (VVT-i) on the intake valves. Several minor changes and refinements were also introduced for increased fuel efficiency and more linear power delivery. Notable changes include a higher 11.5:1 compression ratio, a high-tumble intake port, a longer intake manifold, micro fuel spray injection and low-friction valve lifters.



The 1KR-VET (996 cc) is a turbocharged version of the 1KR-FE that is produced by Daihatsu for use in the top-of-the-range version of the Daihatsu Thor and all variants of the A200 series Rocky. It delivers 98 PS (72 kW; 97 bhp) and 140 N⋅m (103 lb⋅ft) of torque.


See alsoEdit


  1. ^ "PEUGEOT 108: 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. ^ "Toyota Agya - Specifications". Retrieved 2014-09-17.
  4. ^ "Daihatsu Ayla - Specifications". Retrieved 2014-09-17.
  5. ^ "7 Agya Engineering Excellence - Ayla" [7 Keunggulan Mesin Agya - Ayla]. (in Indonesian). 2012-09-24. Retrieved 2014-03-04.
  6. ^ "Astra Daihatsu Indonesia - Daihatsu Hi-Max specification". Astra Daihatsu Motor. Retrieved 2016-11-11.
  7. ^ Tan, Paul (2014-09-15). "Perodua Axia Launched". Retrieved 2014-09-17.
  8. ^ "Perodua Axia Specifications". 2014-09-15. Retrieved 2014-09-17.
  9. ^ Tan, Paul (2014-09-15). "Perodua Axia Launched". Retrieved 2014-09-17.