10 material differences · fewer than 12
Tractor oneLamborghini R-904 (DT)1976–1982No measured PTO figureTractor twoRenault 921-41977–1980No measured PTO figure
Which should you choose?
Read our verdict on the R-904 (DT) and the 921-4 → It is generated from the rows below by a fixed, versioned rule set, and names the figure behind every call.
Field by field
10 material differences · 3 fields identical or within 5%, which is not counted as material
| Field | R-904 (DT) | 921-4 | Gap |
|---|---|---|---|
| Engine | |||
| Engine power, claimed claimed | 90.8 hp | 90.8 hp | — |
| Engine declared | LAMBORGHINI FL-1154/2 | MWM D 227-6 | differs |
| Displacement declared | 4.99 L | 5.66 L | +13% 921-4 |
| Maximum torque declared | — | 249 lb·ft · 337 N·m | — |
| Transmission | |||
| Top speed declared | 15.5 mph · 25 km/h | 15.5 mph · 25 km/h | — |
| Clutch declared | Dry LuK double clutch | Dry LuK double clutch type 310/310 G | differs |
| Hydraulics & hitch | |||
| Pump flow declared | 6.4 gpm · 24.2 L/min | 8.6 gpm · 32.6 L/min | +35% 921-4 |
| Pressure declared | 2,418 psi · 167 bar | 2,321 psi · 160 bar | — |
| Rear PTO speeds declared | 540 rpm | 540/1000 rpm | differs |
| Weight & dimensions | |||
| Unladen weight declared | 6,636 lb · 3,010 kg | 10,847 lb · 4,920 kg | +63% 921-4 |
| Maximum permissible mass declared | — | 17,637 lb · 8,000 kg | — |
| Wheelbase declared | — | 105.6 in · 2,683 mm | — |
| Length declared | 139.0 in · 3,530 mm | 174.9 in · 4,442 mm | +26% 921-4 |
| Width declared | 70.1–97.6 in · 1,780–2,480 mm | 77.2 in · 1,960 mm | differs |
| Ground clearance declared | 18.1 in · 460 mm | 16.9 in · 430 mm | +7% R-904 (DT) |
| Turning radius, braked declared | — | 15.6 ft · 4.75 m | — |
| Fuel tank declared | 63.4 qt · 60.0 L | 216.6 qt · 205.0 L | +242% 921-4 |
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.
Lamborghini R-904 (DT) sources
- Source: Traktorenlexikon, “Lamborghini R 904 DT”
Renault 921-4 sources
- Source: Traktorenlexikon, “Renault 921-4 R7684”
- Source: Traktorenlexikon, “Renault 891 R7681”