International Harvester D-440 or Porsche-Diesel S 309?
Which should you choose?
The data can’t decide this. Power at the PTO shaft cannot be compared: the D-440 has only engine power (gross or net not stated), claimed — a different quantity from power at the shaft; the S 309 has only engine power (gross or net not stated), claimed — a different quantity from power at the shaft.
- The International Harvester D-440 suits loader and hydraulic implement work better on this data: 60% (9.0 L/min / 2.4 gpm) more hydraulic flow.
- The Porsche-Diesel S 309 suits road haulage better on this data: 18% (3.6 km/h / 2.2 mph) more top speed.
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 | D-440 | S 309 | Call |
|---|---|---|---|
| Which puts more power through the PTO shaft? | 29.4 kW (39.4 hp)Traktorenlexikon, “McCormick D-440 Standard” | 29.5 kW (39.6 hp)Traktorenlexikon, “Porsche-Diesel Super S309” | Not comparableNot comparable on power at the PTO shaft: the D-440 has only engine power (gross or net not stated), claimed — a different quantity from power at the shaft; the S 309 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 D-440 and the S 309. |
| Which pulls harder at the drawbar? | — | — | No figureNo call on drawbar power: no figure on record for the D-440 and the S 309. |
| Which pumps more oil for implements? | 24.0 L/min (6.3 gpm)Traktorenlexikon, “McCormick D-440 Standard” | 15.0 L/min (4.0 gpm)Traktorenlexikon, “Porsche-Diesel Super S309” | AheadThe International Harvester D-440 has 60% more hydraulic flow (9.0 L/min / 2.4 gpm) than the Porsche-Diesel S 309 (both pump flow, as stated by the source). |
| Which lifts more on the three-point hitch? | 2,000 kg (4,409 lb)Traktorenlexikon, “McCormick D-440 Standard” | — | No figureNo call on three-point lift: no figure on record for the S 309. |
| Which is heavier, for traction? | 1,940 kg (4,277 lb)Traktorenlexikon, “McCormick D-440 Standard” | 1,450 kg (3,197 lb)Traktorenlexikon, “Porsche-Diesel Super S309” | Ahead (a fact, not an advantage)The International Harvester D-440 is 34% heavier (490 kg / 1,080 lb) than the Porsche-Diesel S 309 (both unladen weight, as stated by the source). |
| Which may carry more ballast and load? | 3,190 kg (7,033 lb)Traktorenlexikon, “McCormick D-440 Standard” | — | No figureNo call on maximum permissible mass: no figure on record for the S 309. |
| Which has the wider choice of gears? | 8Traktorenlexikon, “McCormick D-440 Standard” | 5Traktorenlexikon, “Porsche-Diesel Super S309” | AheadThe International Harvester D-440 has 60% more forward gears (3 gears) than the Porsche-Diesel S 309 (both forward gears, as stated by the source). |
| Which offers a creeper range? | — | — | No figureNo call on a creeper range: not stated for the D-440 and the S 309. |
| Which is faster on the road? | 20 km/h (12.4 mph)Traktorenlexikon, “McCormick D-440 Standard” | 23.6 km/h (14.7 mph)Traktorenlexikon, “Porsche-Diesel Super S309” | AheadThe Porsche-Diesel S 309 has 18% more top speed (3.6 km/h / 2.2 mph) than the International Harvester D-440 (both top speed forward, as stated by the source). |
| Which offers more PTO speeds? | 540 rpmTraktorenlexikon, “McCormick D-440 Standard” | 540 rpmTraktorenlexikon, “Porsche-Diesel Super S309” | EvenEven on PTO speeds: the same speeds (540 rpm). |
| Which PTO runs independently of the ground drive? | independentTraktorenlexikon, “McCormick D-440 Standard” | — | No figureNo call on PTO independence: not stated for the S 309. |
| Which drives on both axles? | 2WDTraktorenlexikon, “McCormick D-440 Standard” | 2WDTraktorenlexikon, “Porsche-Diesel Super S309” | EvenEven on drive: all two-wheel drive. |
| Which is newer, and what about parts? | 1958–1959 | 1961–1963 | 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 International Harvester D-440 has 60% more hydraulic flow (9.0 L/min / 2.4 gpm) than the Porsche-Diesel S 309 (both pump flow, as stated by the source).
- The International Harvester D-440 is 34% heavier (490 kg / 1,080 lb) than the Porsche-Diesel S 309 (both unladen weight, as stated by the source).
- The International Harvester D-440 has 60% more forward gears (3 gears) than the Porsche-Diesel S 309 (both forward gears, as stated by the source).
- The Porsche-Diesel S 309 has 18% more top speed (3.6 km/h / 2.2 mph) than the International Harvester D-440 (both top speed forward, as stated by the source).
- Even on PTO speeds: the same speeds (540 rpm).
- 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 D-440 has only engine power (gross or net not stated), claimed — a different quantity from power at the shaft; the S 309 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, three-point lift, maximum permissible mass, a creeper range and PTO independence.
← Every figure for both machines, side by side, with sources