This page provides a detailed comparison of the specifications for the Hart-Parr Oil King 23-35 and the Twin City 25-45.
| Hart-Parr Oil King 23-35 | Twin City 25-45 | |
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| Engine | ||
| Engine Manufacturer | Hart-Parr | - |
| Engine Cooling Type | Liquid-cooled | Liquid |
| Engine Fuel Type | Kerosene | Kerosene |
| Engine Induction Type | Naturally aspirated | - |
| Engine Cylinders | 1 | 4 |
| Engine Displacement Value | 785 ci (12.9 L) | 905 ci (14.8 L) |
| Engine Rated Rpm | 500 | 600 |
| Transmission | ||
| Transmission Type | Gear | Gear |
| Transmission Forward Gears | 2 | 2 |
| Transmission Reverse Gears | 1 | 1 |
| Dimensions | ||
| Length Value | 107.75 | 220 |
| Width Value | 72 | 80 |
| Operating Weight Value | 12000 lb (5443 kg) | 15500 lb (7031 kg) |
| Miscellaneous | ||
| Chassis | 4x2 2WD | 4x2 2WD |
| Drive Type | 2WD | 2WD |
