Engine Mitsubishi 3B20

The 0.7-liter 3-cylinder Mitsubishi 3B20 engine was produced in Japan from 2006 to 2020 and was installed on the eK Custom, eK Space, eK Wagon and similar Nissan Dayz and Dayz Roox kei cars. This power unit exists in two generations: for the i model and for the eK family of kei cars.

The 3B2 family also includes engines: 3B20T, 3B21 and 3B21T.

The engine was installed on:

  • Mitsubishi i 1 (HA1) in 2006 – 2013;
  • Mitsubishi eK Custom 1 (B11) in 2013 – 2019;
  • Mitsubishi eK Space 1 (B11) in 2014 – 2020;
  • Mitsubishi eK Wagon 1 (B11) in 2013 – 2019;
  • Nissan Dayz 1 (B21) in 2013 – 2019;
  • Nissan Dayz Roox 1 (B21) in 2014 – 2020.


Production years 2006-2020
Displacement, cc 659
Fuel system distributed injection
Power output, hp 49 – 52
Torque output, Nm 56 – 59
Cylinder block aluminum R3
Block head aluminum 12v
Cylinder bore, mm 65.4
Piston stroke, mm 65.4
Compression ratio 10.8 – 12.0
Features DOHC
Hydraulic lifters no
Timing drive chain
Phase regulator MIVEC
Turbocharging no
Recommended engine oil 5W-30
Engine oil capacity, liter 3.4
Fuel type petrol
Euro standards EURO 4/5
Fuel consumption, L/100 km (for Mitsubishi eK Custom 2014)
— city
— highway
— combined
Engine lifespan, km ~200 000
Weight, kg 67 (without attachments)

Disadvantages of the Mitsubishi 3B20 engine

  • For such a volume, this unit is quite reliable and serves up to 200,000 km without problems.
  • On long runs, oil consumption or timing chain stretching is often encountered.
  • Keep the cooling system clean, from any overheating here leads the head.
  • Hardened o-rings can cause grease to seep into spark plug wells.
  • There are no hydraulic lifters and valve clearances will have to be adjusted every 100,000 km.

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