This page provides a detailed comparison of the specifications for the Allis Chalmers Unknown and the Valmet 6250.
| Allis Chalmers Unknown | Valmet 6250 | |
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| Engine | ||
| Engine Manufacturer | Le Roi | Valmet |
| Engine Model | 2-C | 420 DSRE |
| Engine Cooling Type | Liquid-cooled | Liquid-cooled |
| Engine Fuel Type | Gasoline | Diesel |
| Engine Induction Type | Naturally aspirated | Turbocharged |
| Engine Cylinders | 4 | 4 |
| Engine Displacement Value | 138 ci (2.3 L) | 268 ci (4.4 L) |
| Engine Rated Rpm | 1200 | 2200 |
| Engine Power Output Value | - | 79 hp (59.0 kW) |
| Transmission | ||
| Transmission Type | Gear | Three-speed power shift |
| Transmission Forward Gears | 1 | 36 |
| Transmission Reverse Gears | 1 | 36 |
| Dimensions | ||
| Length Value | 156 | 176.2 |
| Width Value | 54 | 85.8 |
| Operating Weight Value | 2500 lb (1134 kg) | 9700 lb (4400 kg) |
| Miscellaneous | ||
| Chassis | 4x2 2WD | 4x4 MFWD 4WD |
| Drive Type | 2WD | Four-wheel drive (4WD) |
| Front Tire Type | - | - |
| Rear Tire Type | - | - |
| Hitch Type | - | Category 2 |
| Hitch Category | - | II |
| Hitch Position | - | Rear |
| Starter Type | - | Electric |
