Renault 421 or Renault 51?
Which should you choose?
The data can’t decide this. Power at the PTO shaft cannot be compared: the 421 has only engine power (gross or net not stated), claimed — a different quantity from power at the shaft; the 51 has only engine power (gross or net not stated), claimed — a different quantity from power at the shaft.
Generated by rule set compare@4 from the figures on the side-by-side table, allowed by route “the same stated configuration”. Measured figures are compared only with measured, claimed only with claimed, at the same test condition; differences within each figure’s tolerance are not called.
What decides it, question by question?
| Question | 421 | 51 | Call |
|---|---|---|---|
| Which puts more power through the PTO shaft? | 30.9 kW (41.4 hp)Traktorenlexikon, “Renault 421 R7431” | 30.9 kW (41.4 hp)Traktorenlexikon, “Renault 51 R7256” | Not comparableNot comparable on power at the PTO shaft: the 421 has only engine power (gross or net not stated), claimed — a different quantity from power at the shaft; the 51 has only engine power (gross or net not stated), claimed — a different quantity from power at the shaft. |
| Which turns a litre of fuel into more work at the shaft? | — | — | No figureNo call on fuel efficiency at the shaft: no figure on record for the 421 and the 51. |
| Which pulls harder at the drawbar? | — | — | No figureNo call on drawbar power: no figure on record for the 421 and the 51. |
| Which pumps more oil for implements? | 25.9 L/min (6.8 gpm)Traktorenlexikon, “Renault 421 R7431” | — | No figureNo call on hydraulic flow: no figure on record for the 51. |
| Which lifts more on the three-point hitch? | 2,040 kg (4,497 lb)Traktorenlexikon, “Renault 421 R7431” | 2,000 kg (4,409 lb)Traktorenlexikon, “Renault 51 R7256” | EvenEven on three-point lift (both lift at the hitch ends, as stated by the source): the difference is under the 10% threshold, too small to call. |
| Which is heavier, for traction? | 2,185 kg (4,817 lb)Traktorenlexikon, “Renault 421 R7431” | 1,600 kg (3,527 lb)Traktorenlexikon, “Renault 51 R7256” | Ahead (a fact, not an advantage)The Renault 421 is 37% heavier (585 kg / 1,290 lb) than the Renault 51 (both unladen weight, as stated by the source). |
| Which may carry more ballast and load? | — | — | No figureNo call on maximum permissible mass: no figure on record for the 421 and the 51. |
| Which has the wider choice of gears? | 10Traktorenlexikon, “Renault 421 R7431” | 6 to 10Traktorenlexikon, “Renault 51 R7256” | EvenEven on forward gears (both forward gears, as stated by the source): the figures vary by configuration and the ranges overlap. |
| Which offers a creeper range? | YesTraktorenlexikon, “Renault 421 R7431” | — | No figureNo call on a creeper range: not stated for the 51. |
| Which is faster on the road? | 25 km/h (15.5 mph)Traktorenlexikon, “Renault 421 R7431” | 25 km/h (15.5 mph)Traktorenlexikon, “Renault 51 R7256” | EvenEven on top speed (both top speed forward, as stated by the source): the difference is under the 10% threshold, too small to call. |
| Which offers more PTO speeds? | 540 rpmTraktorenlexikon, “Renault 421 R7431” | 540 rpmTraktorenlexikon, “Renault 51 R7256” | EvenEven on PTO speeds: the same speeds (540 rpm). |
| Which PTO runs independently of the ground drive? | independentTraktorenlexikon, “Renault 421 R7431” | independentTraktorenlexikon, “Renault 51 R7256” | EvenEven on PTO independence: every PTO is independent. |
| Which drives on both axles? | 2WDTraktorenlexikon, “Renault 421 R7431” | 2WDTraktorenlexikon, “Renault 51 R7256” | EvenEven on drive: all two-wheel drive. |
| Which is newer, and what about parts? | 1972–1977 | 1968–1972 | EvenSame era: production began within 5 years of each other. We hold no parts-availability data, so there is no call on parts. |
What does this mean in plain words?
- The Renault 421 is 37% heavier (585 kg / 1,290 lb) than the Renault 51 (both unladen weight, as stated by the source).
- Even on three-point lift (both lift at the hitch ends, as stated by the source): the difference is under the 10% threshold, too small to call.
- Even on forward gears (both forward gears, as stated by the source): the figures vary by configuration and the ranges overlap.
- Even on top speed (both top speed forward, as stated by the source): the difference is under the 10% threshold, too small to call.
- Even on PTO speeds: the same speeds (540 rpm).
- Even on PTO independence: every PTO is independent.
- Even on drive: all two-wheel drive.
- Same era: production began within 5 years of each other. We hold no parts-availability data, so there is no call on parts.
- Not comparable on power at the PTO shaft: the 421 has only engine power (gross or net not stated), claimed — a different quantity from power at the shaft; the 51 has only engine power (gross or net not stated), claimed — a different quantity from power at the shaft.
- No figure on record for every machine, so no call on: fuel efficiency at the shaft, drawbar power, hydraulic flow, maximum permissible mass and a creeper range.
← Every figure for both machines, side by side, with sources