Head to head · Utility

Allis Chalmers 8550 vs Challenger MT665D

Allis Chalmers 8550 Tractor
Allis ChalmersModel A

Allis Chalmers 8550

Utility

power
300 hp
displacement
731 ci
Cylinders
6
Forward gears
20
Full 8550 specs
Challenger MT665D Tractor
ChallengerModel B

Challenger MT665D

Agricultural

power
299 hp
displacement
514 ci
Cylinders
6
Forward gears
Not recorded
Full MT665D specs
Allis ChalmersAllis Chalmers 8550
vs
ChallengerChallenger MT665D

How they compare

Headline specs vs. the whole Utility

n = 4,321–5,720

Engine Power

▲ 8550 higher · +1 hp (<1%)
8550300 hp
MT665D299 hp
Median Utility Tractor55 hp

8550 is in the 97th percentile; MT665D is in the 96th · 5,383 models

Engine Displacement

▲ 8550 higher · +217 ci (+42%)
8550731 ci
MT665D514 ci
Median Utility Tractor183 ci

8550 is in the 96th percentile; MT665D is in the 94th · 5,580 models

Cylinders

= Effectively tied
85506
MT665D6
Median Utility Tractor4

8550 is in the 93rd percentile; MT665D is in the 93rd · 5,720 models

Operating Weight

▲ 8550 higher · +1,675 lb (+7%)
855027,040 lb
MT665D25,365 lb
Median Utility Tractor5,303 lb

8550 is in the 96th percentile; MT665D is in the 96th · 5,107 models

8550 (A)MT665D (B)Median Utility Tractor

Full comparison

Every spec, side by side

General Information

SpecAllis Chalmers 8550Challenger MT665DDifference
ManufacturerAllis ChalmersChallenger—
Model8550MT665D—
CategoryUtilityAgricultural—

Engine

SpecAllis Chalmers 8550Challenger MT665DDifference
ManufacturerAllis ChalmersSisu Diesel—
Model6120TNot recorded—
Power Output300hp299hp▲ 8550+1 hp · <1%
Rated RPM2,500RPM2,100RPM▲ 8550+400 RPM · +19%
Cylinders66Same
Displacement731ci514ci▲ 8550+217 ci · +42%
Bore5.3in4.4in▲ 8550+0.9 in · +20%
Stroke6.3in5.7in▲ 8550+0.6 in · +11%

Transmission

SpecAllis Chalmers 8550Challenger MT665DDifference
TypePartial Power ShiftContinuously Variable Transmission—

Dimensions & Weight

SpecAllis Chalmers 8550Challenger MT665DDifference
Length285in216in▲ 8550+69 in · +32%
Width95.5inNot recorded—
Height139in141in▲ MT665D+2 in · +1%
Operating Weight27,040lb25,365lb▲ 8550+1,675 lb · +7%

Hydraulics

SpecAllis Chalmers 8550Challenger MT665DDifference
System TypeClosed CenterClosed Center Load Sensing (CCLS)—
Steering TypeHydrostatic PowerHydrostatic PowerSame

Power Take-off (PTO)

SpecAllis Chalmers 8550Challenger MT665DDifference
TypeIndependentNot recorded—
Speed 11,000rpmNot recorded—

Hitch & Towing

SpecAllis Chalmers 8550Challenger MT665DDifference
Hitch TypeThree-Point HitchNot recorded—
Hitch CategoryIV/IIIIII—
Hitch PositionNot recordedRear—

Chassis & Drive

SpecAllis Chalmers 8550Challenger MT665DDifference
Chassis Type4x4 Articulated 4WD4WD—
Drive Type4WD4 Wheel Drive—
Steering TypeHydrostatic PowerHydrostatic PowerSame
Brake TypeHydraulic Wet DiscsNot recorded—

Electrical

SpecAllis Chalmers 8550Challenger MT665DDifference
Starter TypeElectricElectricSame

Capacities

SpecAllis Chalmers 8550Challenger MT665DDifference
Coolant18galNot recorded—

Operator Station

SpecAllis Chalmers 8550Challenger MT665DDifference
TypeAcousta Cab II with heat and air-conditioningCab—

Category context

Both models against the field

Engine Power

median 55 hp
A · 97th percentile (300 hp)B · 96th percentile (299 hp)

Engine Displacement

median 183 ci
A · 96th percentile (731 ci)B · 94th percentile (514 ci)

Cylinders

median 4
A · 93rd percentile (6)B · 93rd percentile (6)

Operating Weight

median 5,303 lb
A · 96th percentile (27,040 lb)B · 96th percentile (25,365 lb)

Length

median 137 in
A · 99th percentile (285 in)B · 95th percentile (216 in)
A · 8550B · MT665DMedian Utility Tractor
Full spec pageAllis Chalmers 8550Full spec pageChallenger MT665D