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･ The world's smallest direct injection medium truck diesel engine with 0.9 L displacement per cylinder.
･A unique square toroidal shape was used for the combustion chamber, which allowed appropriate swirl matching in a wide rotation area, contributing to the improvement of emissions performance.
･ For the cylinder liner, a dry type 1.5 mm-thick chromard liner with high durability was used.
･ Glow plugs were set to the cylinder heads to aid starting for the first time in the world in a direct injection engine. This realized good startability even in cold weather at –25 degrees.
･ It marked the beginning of the shift to direct injection type engines for small to medium size trucks.
･ The 6B series engine was developed and manufactured as a 4-/6-cylinder series engine, and widely used for Isuzu small-sized trucks (Elf), medium-sized trucks (Forward), and industrial and marine use. |
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| Storage location | : | ISUZU MOTORS LIMITED, DEVELOPMENT ADMINISTRATION DEPT., TECHNICAL INFORMATION ADMINISTRATION (3-25-1 Tonomachi, Kawasaki-ku, Kawasaki-shi, Kanagawa 210-8524) | |
| Year manufactured | : | 1972 | |
| Manufacturer | : | Isuzu Motors Limited | |
| Classification | : | Design drawings, literature | |
| Current status | : | In storage: not open to the public | |
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| Model / Manufacture |
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| Model | : | 6BB1 type |  |
| Type | : | Diesel | |
| Company name | : | Isuzu Motors Limited | |
| Location | : | None | |
| Installation model | : | Forward trucks, Medium-sized trucks, buses | |
| Year of manufacture | : | 1972 | |
| Designed by | : | Yasuhei Arai, Masashi Matsushita |
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| Specification |
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| Cylinder arrangement, number of cylinders | : | Inline 6-cylinder | |
| Cycle / cooling method | : | 4-stroke/water-cooled | |
| Valve type / number | : | OHV/ 2-valve | |
| Combustion method | : | Direct injection | |
| Combustion chamber | : | Square combustion chamber | |
| Total displacement | : | 5.393 L | |
| Bore x stroke | : | 102×110 mm | |
| Compression ratio | : | 17.5 | |
| Mass (weight) | : | 475 kg | |
| Body / Size | : | 1088×772×760mm | |
| Injection nozzle | : | Multi-hole type |
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| Performance |
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| Max. power / r.p.m. | : | 107 kW (145 ps)/3200 rpm | |
| Max. torque / r.p.m. | : | 343 N・m (35 kgm)/2000 rpm | |
| Rate of fuel consumption | : | 231 g/kWh (170 g/PSh)/2000 rpm |
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| Exhaust emissions measures | : | None | |
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| Device |
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| Supercharger type | : | None | |
| Intercooler | : | None | |
| Variable device | : | None |
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| Points of interest, topicality | : | ･ The shape of the piston combustion chamber was a patented special square toroidal type. It allowed appropriate swirl matching in a wide rotation area and excellent emissions performance, marking the beginning of the adoption of anomalously shaped combustion chambers.
･ The engine received the JSME Award in 1973 as the direct injection engine with the smallest displacement per cylinder in the world | |
| Features | : | ･ Direct injection type diesel engine
･ Square toroidal type combustion chamber
- Glow plugs were used in the starting system for the first time in a direct injection engine.
･ 4-/6-cylinder series engine | |
| Reference materials | : | ・ Tsunehiro Ito, Yoshitaka Yoshida, "Isuzu Nyu Forward 6BB1 Dizeru Kikan", Nainen Kikan Vol. 12, No. 133, pp. 55-62, Jan. 1973.1
・ Isuzu Diesel 50 Nenshi, May 1987 | |
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