9 material differences · fewer than 12
Tractor oneInternational Harvester 41661972–1976No measured PTO figureTractor twoInternational Harvester 65881978–1981No measured PTO figure
Which should you choose?
We will not advise between these two machines, because they were not built in overlapping years (1972–1976; 1978–1981). The figures below are side by side so you can judge them yourself; each says whether it was measured, claimed or declared by its source.
Field by field
9 material differences · 3 fields identical or within 5%, which is not counted as material
| Field | 4166 | 6588 | Gap |
|---|---|---|---|
| Engine | |||
| Engine power, claimed claimed | 150.9 hp | 149.9 hp | — |
| Engine declared | INTERNATIONAL HARVESTER DT-436 | INTERNATIONAL HARVESTER DT-466 B | differs |
| Displacement declared | 7.14 L | 7.64 L | +7% 6588 |
| Maximum torque declared | — | 450 lb·ft · 610 N·m | — |
| Transmission | |||
| Top speed declared | 18.6 mph · 30 km/h | 18.6 mph · 30 km/h | — |
| Clutch declared | Pedal operated dry single plate clutch | — | — |
| Hydraulics & hitch | |||
| Pump flow declared | 16.5 gpm · 62.5 L/min | 18.0 gpm · 68.1 L/min | +9% 6588 |
| Rear PTO speeds declared | 1000 rpm | 540/1000 rpm | differs |
| Weight & dimensions | |||
| Unladen weight declared | 16,325 lb · 7,405 kg | 17,619 lb · 7,992 kg | +8% 6588 |
| Wheelbase declared | 102.0 in · 2,591 mm | 110.0 in · 2,794 mm | +8% 6588 |
| Length declared | 194.0 in · 4,928 mm | 228.3 in · 5,799 mm | +18% 6588 |
| Width declared | 103.0 in · 2,616 mm | 101.6 in · 2,581 mm | — |
| Ground clearance declared | 17.0 in · 432 mm | 28.4 in · 721 mm | +67% 6588 |
| Fuel tank declared | 400.0 qt · 378.5 L | 360.0 qt · 340.7 L | +11% 4166 |
Height is not in this table. It is not one measurement: the sources measure it to different points — over the cab on some machines, over the steering wheel or the exhaust on others — and the same tractor measured two ways can differ by most of a metre. It appears here only when both machines' figures carry the point they were measured to and it is the same point, which is not the case for these two. Each machine's own page prints its height as its source gives it.
International Harvester 4166 sources
- Source: Traktorenlexikon, “IHC 4166”
- Source: Traktorenlexikon, “IHC 1466”
International Harvester 6588 sources
- Source: Traktorenlexikon, “IHC 6588”
- Source: Traktorenlexikon, “IHC 3588”