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 John Deere 8450
Image not recorded
John DeereModel B
John Deere 8450
Utility
- power
- 225 hp
- displacement
- 466 ci
- Cylinders
- 6
- Forward gears
- 16
Allis ChalmersAllis Chalmers HD21
vs
John DeereJohn Deere 8450
How they compare
Headline specs vs. the whole Agricultural
Engine Power
= Effectively tiedHD21225 hp
8450225 hp
Median Agricultural Tractor110 hp
HD21 is in the 84th percentile; 8450 is in the 84th · 1,028 models
Engine Displacement
▲ HD21 higher · +378 ci (+81%)HD21844 ci
8450466 ci
Median Agricultural Tractor336 ci
HD21 is in the 96th percentile; 8450 is in the 84th · 1,083 models
Cylinders
= Effectively tiedHD216
84506
Median Agricultural Tractor5.5
HD21 is in the 74th percentile; 8450 is in the 74th · 1,130 models
Forward Gears
▲ 8450 higher · +14 (+700%)HD212
845016
Median Agricultural Tractor16
HD21 is in the 1st percentile; 8450 is in the 50th · 972 models
HD21 (A)8450 (B)Median Agricultural Tractor
Full comparison
Every spec, side by side
General Information
| Spec | Allis Chalmers HD21 | John Deere 8450 | Difference |
|---|---|---|---|
| Manufacturer | Allis Chalmers | John Deere | — |
| Model | HD21 | 8450 | — |
| Category | Agricultural | Utility | — |
Engine
| Spec | Allis Chalmers HD21 | John Deere 8450 | Difference |
|---|---|---|---|
| Manufacturer | Allis-Chalmers | John Deere | — |
| Power Output | 225hp | 225hp | Same |
| Rated RPM | 1,800RPM | 2,100RPM | ▲ 8450+300 RPM · +17% |
| Cylinders | 6 | 6 | Same |
| Displacement | 844ci | 466ci | ▲ HD21+378 ci · +81% |
| Bore | 5.3in | 4.6in | ▲ HD21+0.7 in · +15% |
| Stroke | 6.5in | 4.8in | ▲ HD21+1.7 in · +35% |
Transmission
| Spec | Allis Chalmers HD21 | John Deere 8450 | Difference |
|---|---|---|---|
| Type | Torque Converter | Partial power shift | — |
Dimensions & Weight
| Spec | Allis Chalmers HD21 | John Deere 8450 | Difference |
|---|---|---|---|
| Length | 198in | 224in | ▲ 8450+26 in · +13% |
| Height | 99in | Not recorded | — |
| Operating Weight | 45,500lb | 29,150lb | ▲ HD21+16,350 lb · +56% |
Hydraulics
| Spec | Allis Chalmers HD21 | John Deere 8450 | Difference |
|---|---|---|---|
| System Type | Not recorded | Closed-center constant pressure | — |
| Steering Type | Not recorded | Articulated power | — |
Hitch & Towing
| Spec | Allis Chalmers HD21 | John Deere 8450 | Difference |
|---|---|---|---|
| Hitch Type | Not recorded | Three-Point Hitch | — |
| Hitch Category | Not recorded | Category 3 | — |
| Hitch Capacity | Not recorded | 9,262lb | — |
Chassis & Drive
| Spec | Allis Chalmers HD21 | John Deere 8450 | Difference |
|---|---|---|---|
| Chassis Type | Not recorded | 4x4 articulated 4WD | — |
| Drive Type | Not recorded | 4WD | — |
| Steering Type | Not recorded | Articulated power | — |
Electrical
| Spec | Allis Chalmers HD21 | John Deere 8450 | Difference |
|---|---|---|---|
| Starter Type | Electric | 12 volts | — |
Capacities
| Spec | Allis Chalmers HD21 | John Deere 8450 | Difference |
|---|---|---|---|
| Coolant | 20gal | 10.5gal | ▲ HD21+9.5 gal · +90% |
Category context
Both models against the field
Engine Power
median 110 hpA · 84th percentile (225 hp)B · 84th percentile (225 hp)
Engine Displacement
median 336 ciA · 96th percentile (844 ci)B · 84th percentile (466 ci)
Cylinders
median 5.5A · 74th percentile (6)B · 74th percentile (6)
Forward Gears
median 16A · 1st percentile (2)B · 50th percentile (16)
Operating Weight
median 10,914 lbA · 99th percentile (45,500 lb)B · 94th percentile (29,150 lb)
A · HD21B · 8450Median Agricultural Tractor