7 material differences · fewer than 12
Tractor oneDavid Brown 990 Implematic1961–1965No measured PTO figureTractor twoFiat 500 Spezial (DT)1971–1980No measured PTO figure
Which should you choose?
We will not advise between these two machines, because the drive differs (2WD; Two-wheel or four-wheel drive); they were not built in overlapping years (1961–1965; 1971–1980). 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
7 material differences · 5 fields identical or within 5%, which is not counted as material
| Field | 990 Implematic | 500 Spezial (DT) | Gap |
|---|---|---|---|
| Engine | |||
| Engine power, claimed claimed | 52.0 hp | 49.3 hp | +5% 990 Implematic |
| Engine declared | DAVID BROWN AD 4/47 A | FIAT-IVECO 8035.02.204 | differs |
| Displacement declared | 3.04 L | 2.59 L | +17% 990 Implematic |
| Maximum torque declared | 141 lb·ft · 191 N·m | 116 lb·ft · 157 N·m | +22% 990 Implematic |
| Transmission | |||
| Top speed declared | 13.7 mph · 22 km/h | 15.5 mph · 25 km/h | +14% 500 Spezial (DT) |
| Clutch declared | — | Dry LuK double clutch with 279.4 mm disc diameter | — |
| Hydraulics & hitch | |||
| Pump flow declared | 6.0 gpm · 22.7 L/min | — | — |
| Pressure declared | — | 2,843 psi · 196 bar | — |
| Rear PTO speeds declared | 540 rpm | 540 rpm | — |
| Weight & dimensions | |||
| Unladen weight declared | 4,771 lb · 2,164 kg | 4,145 lb · 1,880 kg | +15% 990 Implematic |
| Wheelbase declared | 76.7–78.7 in · 1,948–1,999 mm | 75.6 in · 1,920 mm | — |
| Length declared | 118.0–121.0 in · 2,997–3,073 mm | 119.7 in · 3,041 mm | — |
| Width declared | 64.0 in · 1,626 mm | 62.4 in · 1,585 mm | — |
| Ground clearance declared | 20.0 in · 508 mm | 18.1 in · 459 mm | +11% 990 Implematic |
| Turning radius, braked declared | 10.5 ft · 3.20 m | 9.7 ft · 2.95 m | +8% 990 Implematic |
| Fuel tank declared | 55.2 qt · 52.2 L | 57.1 qt · 54.0 L | — |
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.
David Brown 990 Implematic sources
- Source: Traktorenlexikon, “David Brown 990 Implematic”
Fiat 500 Spezial (DT) sources
- Source: Traktorenlexikon, “Fiat 500 Special/500 Special DT”