Fiat 420 (DT) or Renault 421 M?
Which should you choose?
The data can’t decide this. Power at the PTO shaft cannot be compared: the 420 (DT) has only engine power (gross or net not stated), claimed — a different quantity from power at the shaft; the 421 M 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 | 420 (DT) | 421 M | Call |
|---|---|---|---|
| Which puts more power through the PTO shaft? | 30.9 kW (41.4 hp)Traktorenlexikon, “Fiat 420/420 DT” | 30.9 kW (41.4 hp)Traktorenlexikon, “Renault 421 M / R 7421” | Not comparableNot comparable on power at the PTO shaft: the 420 (DT) has only engine power (gross or net not stated), claimed — a different quantity from power at the shaft; the 421 M 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 420 (DT) and the 421 M. |
| Which pulls harder at the drawbar? | — | — | No figureNo call on drawbar power: no figure on record for the 420 (DT) and the 421 M. |
| Which pumps more oil for implements? | — | 25.9 L/min (6.8 gpm)Traktorenlexikon, “Renault 421 M / R 7421” | No figureNo call on hydraulic flow: no figure on record for the 420 (DT). |
| Which lifts more on the three-point hitch? | 1,080 kg (2,381 lb)Traktorenlexikon, “Fiat 420/420 DT” | — | No figureNo call on three-point lift: no figure on record for the 421 M. |
| Which is heavier, for traction? | 1,650 kg (3,638 lb)Traktorenlexikon, “Fiat 420/420 DT” | 1,995 kg (4,398 lb)Traktorenlexikon, “Renault 421 M / R 7421” | Ahead (a fact, not an advantage)The Renault 421M is 21% heavier (345 kg / 761 lb) than the Fiat 420 (DT) (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 420 (DT) and the 421 M. |
| Which has the wider choice of gears? | 6 to 9Traktorenlexikon, “Fiat 420/420 DT” | 10Traktorenlexikon, “Renault 421 M / R 7421” | EvenEven on forward gears (both forward gears, as stated by the source): the difference is under the 25% threshold, too small to call. |
| Which offers a creeper range? | — | YesTraktorenlexikon, “Renault 421 M / R 7421” | No figureNo call on a creeper range: not stated for the 420 (DT). |
| Which is faster on the road? | 25 km/h (15.5 mph)Traktorenlexikon, “Fiat 420/420 DT” | 25 km/h (15.5 mph)Traktorenlexikon, “Renault 421 M / R 7421” | 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, “Fiat 420/420 DT” | 540 rpmTraktorenlexikon, “Renault 421 M / R 7421” | EvenEven on PTO speeds: the same speeds (540 rpm). |
| Which PTO runs independently of the ground drive? | independentTraktorenlexikon, “Fiat 420/420 DT” | independentTraktorenlexikon, “Renault 421 M / R 7421” | EvenEven on PTO independence: every PTO is independent. |
| Which drives on both axles? | Two-wheel or four-wheel driveTraktorenlexikon, “Fiat 420/420 DT” | 2WDTraktorenlexikon, “Renault 421 M / R 7421” | AheadThe Fiat 420 (DT) is available with four-wheel drive; the Renault 421M is two-wheel drive (as stated by the sources). |
| Which is newer, and what about parts? | 1978–1985 | 1977–1985 | 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 421M is 21% heavier (345 kg / 761 lb) than the Fiat 420 (DT) (both unladen weight, as stated by the source).
- The Fiat 420 (DT) is available with four-wheel drive; the Renault 421M is two-wheel drive (as stated by the sources).
- Even on forward gears (both forward gears, as stated by the source): the difference is under the 25% threshold, too small to call.
- 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.
- 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 420 (DT) has only engine power (gross or net not stated), claimed — a different quantity from power at the shaft; the 421 M 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, three-point lift, maximum permissible mass and a creeper range.
← Every figure for both machines, side by side, with sources