The eK Custom, eK Space, eK Wagon, and comparable Nissan Dayz and Dayz Roox kei vehicles were equipped with the 0.7-liter, three-cylinder Mitsubishi 3B20 engine, which was manufactured in Japan between 2006 and 2020. The i model and the eK family of Kei cars are the two generations of this power unit.
The engines 3B20T, 3B21, and 3B21T are also part of the 3B2 family.
The engine was mounted 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.
Specifications
| 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 |
5.2 3.2 4.0 |
| Engine lifespan, km | ~200 000 |
| Weight, kg | 67 (without attachments) |
Disadvantages of the Mitsubishi 3B20 engine
This unit is very dependable for such a volume and operates flawlessly for up to 200,000 kilometers.
Long runs frequently result in timing chain stretching or oil consumption.
Maintain a clean cooling system to prevent head overheating.
Grease may seep into spark plug wells due to hardened o-rings.
Every 100,000 kilometers, valve clearances must be changed because there are no hydraulic lifters.