| Mitsubishi 3G8 engine | |
|---|---|
 | |
| Overview | |
| Manufacturer | Mitsubishi Motors |
| Production | 1987–present |
| Layout | |
| Configuration | Straight-3 |
| Displacement | 548 cc (33.4 cu in) 657 cc (40.1 cu in) 796 cc (48.6 cu in) 1,061 cc (64.7 cu in) |
| Cylinder bore |
|
| Piston stroke |
|
| Cylinder block material | Cast iron |
| Valvetrain | SOHC 2 Valves x Cyl.DOHC5 Valves x Cyl. |
| Compression ratio | 8.5:1, 9.8:1, 10.0:1 |
| Combustion | |
| Supercharger | Available 1987–1990 |
| Turbocharger | with air-to-airintercooler (on 1989-1990 models) |
| Fuel system | Carburetor Electronic fuel injection |
| Fuel type | Gasoline |
| Cooling system | Water cooled |
| Output | |
| Power output | 22–47 kW (30–64 PS; 30–63 hp) |
| Torque output | 41–96 N⋅m (30–71 lb⋅ft) |
TheMitsubishi 3G8 engine is a range of three-cylinderpowerplant fromMitsubishi Motors, introduced in the fifth generation of theirMitsubishi Minicakei car. In common with other contemporary engines in the class, it could be specified with many advanced technologies despite its diminutive size, includingmulti-valvecylinder heads anddouble overhead camshafts. The top-of-the-lineDangan ZZ variant was also the first kei car to benefit fromturbocharging. In 1987 Mitsubishi was the first manufacturer to supercharge a kei vehicle, and in 1989 became the world's first production car to feature five valves per cylinder, ahead of similar developments byBugatti,Audi,Ferrari andToyota.[1][2]
Its 3G81 three-cylinder engine has adisplacement of 548 cc (33.4 cu in) and the 15-valve versions feature three intake valves and two exhaust valves incorporated into each cylinder. The valves are controlled bytwin overhead camshafts through rollercam followers on finger rockers with hydraulic automatic lash adjusters. Gasoline is electronically injected through triple-jet nozzles (also a technological first). Thewater-cooled turbocharger operates through an air-to-airintercooler. The ignition timing advance is also controlled electronically, and a knock-sensing system is included.[1]
Originally a 548 cc (33.4 cu in) engine, it was enlarged to 657 cc (40.1 cu in) in 1990 following changes in the class regulations. The four-cylinder4A3 engine is derived from the 3G8, sharing a 72 mm (2.8 in)bore pitch.[3]
.JPG)
Engine dimensions — 548 cc (33.4 cu in) inline three-cylinder
Bore — 62.3 mm (2.45 in)
Stroke — 60.0 mm (2.36 in)
Fuel type — Unleaded regular gasoline
Versions
| Valvetrain | Fuel feed | Comp. | Power (JIS net) | Torque | Fitment | Notes | |||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| PS | kW | at rpm | kgm | Nm | lbft | at rpm | |||||
| SOHC 6-valve | Single-barrel, downdraught carburetor | 9.8:1 | 30 | 22 | 6,500 | 4.2 | 41 | 30 | 3,000 | Mitsubishi Minica Econo H14V/15V (87.01–88.12) Mitsubishi Minica H21V/26V (89.01–90.02) | Commercial vehicle emissions standards |
| Single-barrel, sidedraught variable venturi carburetor | 30 | 22 | 5,500 | 4.4 | 43 | 32 | 4,000 | Mitsubishi Minicab U14T/V, U15T/V (87.06–90.02) Mitsubishi Bravo U14V/15V (89.02–90.02) | |||
| Double-barrel, downdraught carburetor | 32 | 24 | 6,500 | 4.3 | 42 | 31 | 4,000 | Mitsubishi Minica H14A/15A (87.01–88.12) Mitsubishi Minica H21A/26A (89.01–90.02) | |||
| Single-barrel, sidedraught variable venturi carburetor, Supercharger | 8.5:1 | 46 | 34 | 6,000 | 6.0 | 59 | 43 | 4,000 | Mitsubishi Minicab U14T/V, U15T/V (87.06–91.02) Mitsubishi Bravo U14V/15V (89.02–91.02) | ||
| Single-barrel, downdraught carburetor,turbocharger | 50 | 37 | 6,500 | 6.7 | 66 | 48 | 3,500 | Mitsubishi Minica/Econo H14A/V (87.01–88.12) | |||
| DOHC 15-valve | Double-barrel, downdraught carburetor | 10.0:1 | 38 | 28 | 7,000 | 4.4 | 43 | 32 | 4,500 | Mitsubishi Minica H21/26 (89.08–90.02) | |
| EFI | 46 | 34 | 7,500 | 4.7 | 46 | 34 | 5,500 | ||||
| EFI, turbocharger,IC | 8.5:1 | 64 | 47 | 7,500 | 7.6 | 75 | 55 | 4,500 | Mitsubishi Minica Dangan ZZ H21/26 (89.01–90.08) | ||
Displacement — 796 cc (48.6 cu in)
Bore — 65 mm (2.56 in)
Stroke — 80 mm (3.15 in)
Engine type — Inline three-cylinder SOHC 6 valves
Power — 33 kW (45 PS; 44 hp) at unknown rpm
This was built only for the Taiwanese marketMitsubishi Towny (Minica) andMinicab 800, from 01.87 - 11.88. Most specifications are unknown.
Displacement — 657 cc (40.1 cu in)
Bore — 65 mm (2.56 in)
Stroke — 66 mm (2.6 in)
Fuel type — Unleaded regular gasoline
Displacement — 1,061 cc (64.7 cu in)
Bore — 65 mm (2.56 in)
Stroke — 80 mm (3.15 in)
Engine type — Inline four-cylinder SOHC
Power — 43 kW (58 PS; 58 hp)JIS at 5,500 rpm
Torque — 9.1 kg⋅m (89 N⋅m; 66 lb⋅ft) at 3,500 rpm[4]
Of the same dimensions as the3G82 but with a fourth cylinder, this was built in Taiwan byCMC (China Motor Corporation). Used in the Mitsubishi Varica (LWB version of fourth generationMitsubishi Minicab).
