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| This was a new compressed natural gas multi-point injection (CNG MPI) engine that was developed and mounted in the 2005 Isuzu Elf. This engine was the first to conform to the new long-term regulations in Japan for CNG commercial vehicles, and obtained type approval from the Ministry of Land, Infrastructure and Transport. |
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| Storage location | : | ISUZU MOTORS LIMITED | |
| Year manufactured | : | 2005 | |
| Manufacturer | : | Isuzu Motors Limited | |
| Classification | : | Mass-production product | |
| Current status | : | In use: open to the public | |
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| Model / Manufacture |
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| Model | : | 4HV1 (CNG) |  |
| Type | : | Compressed natural gas | |
| Company name | : | Isuzu Motors Limited | |
| Usage | : | Small trucks | |
| Location | : | Isuzu Motors Limited | |
| Installation model | : | Elf | |
| Year of manufacture | : | 2005 | |
| Designed by | : | Isuzu Motors Limited |
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| Specification |
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| Cylinder arrangement, number of cylinders | : | Inline 4-cylinder lateral layout | |
| Cycle / cooling method | : | 4/water-cooled | |
| Valve type / number | : | OHC/4-valve | |
| Combustion method | : | Combustion injection type | |
| Combustion chamber | : | Hemispherical | |
| Total displacement | : | 4.570 L | |
| Bore x stroke | : | φ115×110 | |
| Compression ratio | : | 12.5 | |
| Mass (weight) | : | 365 (M/T), 342 (AMT) | |
| Dimensions | : | 830×635×750 | |
| Ignition system | : | Full transistor type (battery ignition) |
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| Performance |
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| Max. output | : | 96 kW/3200 rpm | |
| Max. torque | : | 363 N・m/1400 rpm |
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| Exhaust emissions measures | : | Conforms to new long-term regulation | |
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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 | : | It promptly conformed to new long-term regulations and obtained type approval from the Ministry of Land, Infrastructure and Transport. | |
| Features | : | The engine achieved ultra-low emissions performance with both improved output and low fuel consumption. | |
| Reference materials | : | Isuzu Technical Journal No. 113 | |
| Introduction | : | The Isuzu Elf CNG vehicle was the top seller among CNG vehicles in Japan. Its new engine was further advanced by conformance with the new long-term regulations in April 2005, the achievement of ultra-low emissions performance, improved output torque, and reduced fuel consumption.
The new 4HV1 engine that used the MPI method for the fuel system precisely controlled fuel injection volume and injection timing using an injector laid out in each cylinder. The oxidation reduction performance of the three-way catalyst was maximized by creating the best combustion conditions through optimal electronic control of the air-fuel ratio. Consequently, NOx, HC, and CO emissions were minimized, and the Elf became the first CNG commercial vehicle to conform to the new long-term regulations (2003 CNG vehicle emission gas technical guidelines in) in Japan. It also realized the largest output and torque in its class while maintaining excellent fuel economy and quietness. | |
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