This page provides a detailed comparison of the specifications for the Challenger MT645B and the Challenger MT665B.
| Challenger MT645B | Challenger MT665B | |
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| Engine | ||
| Engine Manufacturer | Sisu | Sisu |
| Engine Model | 74ETA | 84ETA |
| Engine Cooling Type | Liquid-cooled | Liquid |
| Engine Fuel Type | Diesel | Diesel |
| Engine Induction Type | Turbocharged | Turbocharged |
| Engine Cylinders | 6 | 6 |
| Engine Displacement Value | 449 ci (7.4 L) | 513 ci (8.4 L) |
| Engine Rated Rpm | 2200 | 2200 |
| Engine Power Output Value | 235 hp (175.2 kW) | 290 hp (216.3 kW) |
| Transmission | ||
| Transmission Type | continuously variable transmission (CVT) | Power Shift |
| Transmission Forward Gears | infinite | 18 |
| Transmission Reverse Gears | infinite | 9 |
| Dimensions | ||
| Length Value | 206 | 206 |
| Width Value | 118 | 118 |
| Operating Weight Value | 19595 lb (8888 kg) | 19550 lb (8868 kg) |
| Miscellaneous | ||
| Chassis | - | 4x4 |
| Drive Type | - | 4WD |
| Front Tire Type | - | - |
| Rear Tire Type | - | - |
| Hitch Type | Three-Point Hitch | Three-Point Hitch |
| Hitch Category | III | III |
| Hitch Position | Rear | Rear |
| Hydraulic System Type | Pressure Flow Compensated (PFC) | Open Center |
| Operator Station Type | - | Cab |
| Starter Type | Electric | Electric Starter |
