Allis ChalmersModel A
Allis Chalmers HD21
Agricultural
- power
- 225 hp
- displacement
- 844 ci
- Cylinders
- 6
- Forward gears
- 2
Head to head · Agricultural
Allis Chalmers HD21 vs Deutz-Fahr AgroStar 8.31
Image not recorded
Deutz-FahrModel B
Deutz-Fahr AgroStar 8.31
Agricultural
- power
- 230 hp
- displacement
- 584 ci
- Cylinders
- 6
- Forward gears
- 18
Allis ChalmersAllis Chalmers HD21
vs
Deutz-FahrDeutz-Fahr AgroStar 8.31
How they compare
Headline specs vs. the whole Agricultural
Engine Power
▲ AgroStar 8.31 higher · +5 hp (+2%)HD21225 hp
AgroStar 8.31230 hp
Median Agricultural Tractor110 hp
HD21 is in the 84th percentile; AgroStar 8.31 is in the 85th · 1,028 models
Engine Displacement
▲ HD21 higher · +260 ci (+45%)HD21844 ci
AgroStar 8.31584 ci
Median Agricultural Tractor336 ci
HD21 is in the 96th percentile; AgroStar 8.31 is in the 92nd · 1,083 models
Cylinders
= Effectively tiedHD216
AgroStar 8.316
Median Agricultural Tractor5.5
HD21 is in the 74th percentile; AgroStar 8.31 is in the 74th · 1,130 models
Forward Gears
▲ AgroStar 8.31 higher · +16 (+800%)HD212
AgroStar 8.3118
Median Agricultural Tractor16
HD21 is in the 1st percentile; AgroStar 8.31 is in the 68th · 972 models
HD21 (A)AgroStar 8.31 (B)Median Agricultural Tractor
Full comparison
Every spec, side by side
General Information
| Spec | Allis Chalmers HD21 | Deutz-Fahr AgroStar 8.31 | Difference |
|---|---|---|---|
| Manufacturer | Allis Chalmers | Deutz-Fahr | — |
| Model | HD21 | AgroStar 8.31 | — |
| Category | Agricultural | Agricultural | Same |
Engine
| Spec | Allis Chalmers HD21 | Deutz-Fahr AgroStar 8.31 | Difference |
|---|---|---|---|
| Manufacturer | Allis-Chalmers | Deutz | — |
| Power Output | 225hp | 230hp | ▲ AgroStar 8.31+5 hp · +2% |
| Rated RPM | 1,800RPM | 2,300RPM | ▲ AgroStar 8.31+500 RPM · +28% |
| Cylinders | 6 | 6 | Same |
| Displacement | 844ci | 584ci | ▲ HD21+260 ci · +45% |
| Bore | 5.3in | 4.9in | ▲ HD21+0.4 in · +8% |
| Stroke | 6.5in | 5.1in | ▲ HD21+1.4 in · +27% |
Transmission
| Spec | Allis Chalmers HD21 | Deutz-Fahr AgroStar 8.31 | Difference |
|---|---|---|---|
| Type | Torque Converter | Manual | — |
Dimensions & Weight
| Spec | Allis Chalmers HD21 | Deutz-Fahr AgroStar 8.31 | Difference |
|---|---|---|---|
| Length | 198in | 200in | ▲ AgroStar 8.31+2 in · +1% |
| Height | 99in | 121in | ▲ AgroStar 8.31+22 in · +22% |
| Operating Weight | 45,500lb | 19,293lb | ▲ HD21+26,207 lb · +136% |
Chassis & Drive
| Spec | Allis Chalmers HD21 | Deutz-Fahr AgroStar 8.31 | Difference |
|---|---|---|---|
| Chassis Type | Not recorded | 4x4 MFWD 4WD | — |
| Drive Type | Not recorded | 4WD | — |
Electrical
| Spec | Allis Chalmers HD21 | Deutz-Fahr AgroStar 8.31 | Difference |
|---|---|---|---|
| Starter Type | Electric | Not recorded | — |
Capacities
| Spec | Allis Chalmers HD21 | Deutz-Fahr AgroStar 8.31 | Difference |
|---|---|---|---|
| Coolant | 20gal | Not recorded | — |
Category context
Both models against the field
Engine Power
median 110 hpA · 84th percentile (225 hp)B · 85th percentile (230 hp)
Engine Displacement
median 336 ciA · 96th percentile (844 ci)B · 92nd percentile (584 ci)
Cylinders
median 5.5A · 74th percentile (6)B · 74th percentile (6)
Forward Gears
median 16A · 1st percentile (2)B · 68th percentile (18)
Operating Weight
median 10,914 lbA · 99th percentile (45,500 lb)B · 81st percentile (19,293 lb)
A · HD21B · AgroStar 8.31Median Agricultural Tractor