The Hyundai O-302 bus, produced under license from Mercedes-Benz between 1972 and 1982, is a masterpiece of mechanical endurance. This bus was the backbone of long-distance travel, known for its rigid construction and high-torque diesel engines. Below are the comprehensive technical specifications for this legendary model.
Engine and Powertrain:
The Hyundai O-302 was primarily equipped with the Mercedes-Benz OM352 or OM355 diesel engines. The OM355 variant featured an 11.6-liter naturally aspirated Inline-6 engine, delivering approximately 230 to 240 horsepower and a massive 800 Nm of torque at low RPMs. This engine was mated to a 5-speed synchronized manual transmission (ZF or Mercedes-Benz type), ensuring reliable power delivery under full load. The fuel tank capacity typically ranged from 200 to 400 liters to support long-haul journeys.
Chassis and Suspension:
Built on a heavy-duty ladder-frame chassis, the O-302 utilized a semi-elliptic leaf spring suspension system combined with hydraulic telescopic shock absorbers on both front and rear axles. This setup was specifically engineered to handle uneven road surfaces while maintaining stability. The braking system used a dual-circuit air brake (Pneumatic) on all wheels, which was a significant safety standard for large vehicles in the 1970s.
Dimensions and Capacity:
- Overall Length: Approximately 10 to 12 meters depending on the wheelbase version.
- Overall Width: 2.5 meters.
- Overall Height: 3.1 to 3.2 meters.
- Wheelbase: 5.2 to 5.9 meters.
- Seating Capacity: Standard configuration offered 41 to 45 seats plus the driver.
- Gross Vehicle Weight (GVW): Around 14,000 kg to 16,000 kg.
Interior Features and Comfort:
The O-302 was designed for long-distance comfort, featuring an interior ceiling height of approximately 1.9 meters to allow easy movement. The bus included overhead ventilation ducts and high-back upholstered seats. Advanced versions for the time featured a forced-air heating system and large panoramic side windows for enhanced visibility. The dashboard was equipped with essential gauges for air pressure, engine temperature, and an analog tachograph.
Performance and Reliability:
The maximum speed of the Hyundai O-302 was rated at approximately 100 to 110 km/h, which was ideal for highway cruising at the time. Its real strength lay in its ability to operate in extreme temperatures and difficult terrains with minimal maintenance. The simplicity of its mechanical fuel injection system meant it could run on various grades of diesel without the complexity of modern electronic sensors.