8 material differences · fewer than 12
Tractor oneDavid Brown 990 Implematic1961–1965No measured PTO figureTractor twoJ.I. Case 511-B1958–1960No measured PTO figure
Which should you choose?
We will not advise between these two machines, because they were not built in overlapping years (1961–1965; 1958–1960). 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
8 material differences · 3 fields identical or within 5%, which is not counted as material
| Field | 990 Implematic | 511-B | Gap |
|---|---|---|---|
| Engine | |||
| Engine power, claimed claimed | 52.0 hp | 44.4 hp | +17% 990 Implematic |
| Engine declared | DAVID BROWN AD 4/47 A | CASE 164 | differs |
| Displacement declared | 3.04 L | 2.70 L | +13% 990 Implematic |
| Maximum torque declared | 141 lb·ft · 191 N·m | — | — |
| Transmission | |||
| Top speed declared | 13.7 mph · 22 km/h | 12.4–18.6 mph · 20–30 km/h | differs |
| Clutch declared | — | pedal-operated CASE single-plate clutch | — |
| Hydraulics & hitch | |||
| Pump flow declared | 6.0 gpm · 22.7 L/min | 3.0 gpm · 11.4 L/min | +99% 990 Implematic |
| Rear PTO speeds declared | 540 rpm | 540 rpm | — |
| Weight & dimensions | |||
| Unladen weight declared | 4,771 lb · 2,164 kg | 4,720 lb · 2,141 kg | — |
| Wheelbase declared | 76.7–78.7 in · 1,948–1,999 mm | 87.0 in · 2,210 mm | differs |
| Length declared | 118.0–121.0 in · 2,997–3,073 mm | 138.0 in · 3,505 mm | differs |
| Width declared | 64.0 in · 1,626 mm | 80.7 in · 2,051 mm | +26% 511-B |
| Height, over the bonnet declared | 56.0 in · 1,422 mm | 65.5 in · 1,664 mm | +17% 511-B |
| Ground clearance declared | 20.0 in · 508 mm | — | — |
| Turning radius, braked declared | 10.5 ft · 3.20 m | — | — |
| Fuel tank declared | 55.2 qt · 52.2 L | 55.2 qt · 52.2 L | — |
David Brown 990 Implematic sources
Source
- Source: Traktorenlexikon, “David Brown 990 Implematic”
J.I. Case 511-B sources
Source
- Source: Traktorenlexikon, “Case 511-B”