Allis ChalmersModel A
Allis Chalmers HD11
Crawler
- power
- 110 hp
- displacement
- 516 ci
- Cylinders
- 6
- Forward gears
- 6
Head to head · Agricultural
Allis Chalmers HD11 vs Allis Chalmers HD21
Allis ChalmersModel B
Allis Chalmers HD21
Agricultural
- power
- 225 hp
- displacement
- 844 ci
- Cylinders
- 6
- Forward gears
- 2
Allis ChalmersAllis Chalmers HD11
vs
Allis ChalmersAllis Chalmers HD21
How they compare
Headline specs vs. the whole Agricultural
Engine Power
▲ HD21 higher · +115 hp (+105%)HD11110 hp
HD21225 hp
Median Agricultural Tractor110 hp
HD11 is in the 50th percentile; HD21 is in the 84th · 1,028 models
Engine Displacement
▲ HD21 higher · +328 ci (+64%)HD11516 ci
HD21844 ci
Median Agricultural Tractor336 ci
HD11 is in the 89th percentile; HD21 is in the 96th · 1,083 models
Cylinders
= Effectively tiedHD116
HD216
Median Agricultural Tractor5.5
HD11 is in the 74th percentile; HD21 is in the 74th · 1,130 models
Forward Gears
▲ HD11 higher · +4 (+200%)HD116
HD212
Median Agricultural Tractor16
HD11 is in the 11th percentile; HD21 is in the 1st · 972 models
HD11 (A)HD21 (B)Median Agricultural Tractor
Full comparison
Every spec, side by side
General Information
| Spec | Allis Chalmers HD11 | Allis Chalmers HD21 | Difference |
|---|---|---|---|
| Manufacturer | Allis Chalmers | Allis Chalmers | Same |
| Model | HD11 | HD21 | — |
| Category | Crawler, Agricultural | Agricultural | — |
Engine
| Spec | Allis Chalmers HD11 | Allis Chalmers HD21 | Difference |
|---|---|---|---|
| Manufacturer | Allis Chalmers | Allis-Chalmers | — |
| Model | HD-516 | Not recorded | — |
| Power Output | 110hp | 225hp | ▲ HD21+115 hp · +105% |
| Rated RPM | 1,800RPM | 1,800RPM | Same |
| Cylinders | 6 | 6 | Same |
| Displacement | 516ci | 844ci | ▲ HD21+328 ci · +64% |
| Bore | 4.5in | 5.3in | ▲ HD21+0.8 in · +18% |
| Stroke | 5.6in | 6.5in | ▲ HD21+1 in · +18% |
Transmission
| Spec | Allis Chalmers HD11 | Allis Chalmers HD21 | Difference |
|---|---|---|---|
| Type | Sliding Gear | Torque Converter | — |
Dimensions & Weight
| Spec | Allis Chalmers HD11 | Allis Chalmers HD21 | Difference |
|---|---|---|---|
| Length | 154in | 198in | ▲ HD21+44 in · +29% |
| Width | 40in | Not recorded | — |
| Height | 84in | 99in | ▲ HD21+15 in · +18% |
| Operating Weight | 21,000lb | 45,500lb | ▲ HD21+24,500 lb · +117% |
Chassis & Drive
| Spec | Allis Chalmers HD11 | Allis Chalmers HD21 | Difference |
|---|---|---|---|
| Chassis Type | Crawler | Not recorded | — |
| Brake Type | Contracting band | Not recorded | — |
Electrical
| Spec | Allis Chalmers HD11 | Allis Chalmers HD21 | Difference |
|---|---|---|---|
| Starter Type | Electric | Electric | Same |
Capacities
| Spec | Allis Chalmers HD11 | Allis Chalmers HD21 | Difference |
|---|---|---|---|
| Coolant | 11gal | 20gal | ▲ HD21+9 gal · +82% |
Operator Station
| Spec | Allis Chalmers HD11 | Allis Chalmers HD21 | Difference |
|---|---|---|---|
| Type | Open operator station | Not recorded | — |
Category context
Both models against the field
Engine Power
median 110 hpA · 50th percentile (110 hp)B · 84th percentile (225 hp)
Engine Displacement
median 336 ciA · 89th percentile (516 ci)B · 96th percentile (844 ci)
Cylinders
median 5.5A · 74th percentile (6)B · 74th percentile (6)
Forward Gears
median 16A · 11th percentile (6)B · 1st percentile (2)
Operating Weight
median 10,914 lbA · 87th percentile (21,000 lb)B · 99th percentile (45,500 lb)
A · HD11B · HD21Median Agricultural Tractor