Hudson Reference Sheet No. 34 – (January 1931)
Hudson Motor Car Co., Detroit, U. S. A.
REVISED JANUARY, 1931.
Mechanical Specifications for Essex
Super Six - 1931 Model
ENGINE
Make
Model
No. of cylinders
Cylinder arrangement
Bore
Stroke
Rated H. P.
Firing order
Hudson
Essex Super Six
6
Vertical
2 7/8”
4 1/2”
19.8
1-5-3-6-2-4
Piston displacement
Suspension
Type of head
Cylinder head
Cylinders in block
Crankcase
Material
Oil pan
175.28
4 Point
L
Detachable
6
Integral
Cast iron
Pressed steel
CAMSHAFT DRIVE
Type of drive
Make
Type
Width
Camshaft sprocket
Chain
Morse
No. 28
1 1/4”
38 Teeth
No. of links
Pitch
Adjustment
Sprocket material
57
1/2”
Adjustable eccentric
Cast iron
CAMSHAFT BEARINGS
Number of bearings
No. 1 front - diameter
No. 1 length
3
2”
1-1/16”
No. 2 diameter
No. 2 length
No. 3 diameter
No. 3 length
1 31/32”
1-1/16”
1-1/2”
15/16”
VALVES
Head material
Head diameter (outside)
Head diameter (opening)
Stem length
Stem diameter
Stem type of end
Tappet-type
Tappet clearance
Valve lift
Valve stem guides
Spring pressure
Inlet
Silicon steel
1-3/8”
1-1/4”
5-1/32”
5/16”
Grooved
Roller
.003”-.005”
5/16”
Removable
50 lbs.
Exhaust
Silicon steel
1-3/8”
1-1/4”
5-1/32”
5/16”
Grooved
Roller
.005” -.007”
21/64
Removable
50 lbs.
Page 1
Hudson Reference Sheet No. 34 – (January 1931)
Hudson Motor Car Co., Detroit, U. S. A.
CRANKCASE AND CRANKSHAFT
No. of main bearings
No. 1 (front) - diameter
No. 1 length
No. 2 diameter
No. 2 length
No. 3 diameter
No. 3 length
3
2-11/32”
1-5/8”
2-3/8”
1-3/4”
2-13/32”
1 3/4”
Crank pin diameter
Main bearing material
Main bearing clearance
Main bearing end play
End thrust on
Sprocket
Material
1-15/16”
Bronze & babbitt
.001” -.0015”
.006” -.012”
Center bearing
19 teeth
Steel
CONNECTING ROD
Material
Weight
Length C. to C.
Lower end bearing
diameter
D. F. Steel
1.7 lbs.
8-3/16”
Lower end bearing clearance
Length
Clearance (endwise)
Type
Material
1-15/16”
.001”
1 3/8”
.006” -.010”
Spun
Babbitt
PISTON
Type
Material
Weight
Length
Pin center to top
T Slot Trunk
Aluminum Alloy
9 ounces
3-1/16”
1-11/16”
Distance between bosses
Clearance at skirt
Depth of grooves
Lower grooves (2)
Number of holes
Diameter of holes
1-1/8”
.002” -.0025”
.156”
Drilled radially
8 and 8
1/8” and 3/32”
PISTON RINGS
Material
Type of joint
No. of compression rings
Width of compression rings
Cast Iron
Mitre
2
3/32”
Gap Clearance
No. of oil rings
Width of upper oil ring
Width of lower oil ring
.007” -.009”
2
1/8”
3/16”
PISTON PIN
Type
Diameter
Length
Floating
3/4”
2-1/8”
Bushing - outside diameter
Bushing - inside diameter
Bushing - length
15/16”
3/4”
15/16”
LUBRICATION SYSTEM
Type
Oil pump type
Stroke of pump
Capacity - Oil reservoir only
Capacity - Oil reservoir and troughs
Mesh of screen
Oil recommended
Circulating splash
Oscillating Plunger
Not adjustable
5 quarts
6 quarts
50
Medium heavy - Use low cold test in winter.
COOLING SYSTEM
Type
Radiator - make
Core - type
Page 2
Thermo-syphon
Harrison
Ribbon cellular
Hudson Reference Sheet No. 34 – (January 1931)
Hudson Motor Car Co., Detroit, U. S. A.
COOLING SYSTEM - (Cont’d)
Capacity of cooling system
Radiator hose, upper, diameter
Radiator hose, upper, length
Radiator hose, lower, diameter
Radiator hose, lower, length
Fan belt
Fan - make
Fan bearing type
4-5/8 gallons
2-1/4”
7-1/2”
2-1/4”
14-1/2”
“ V” type
Hudson
Plain
FUEL SYSTEM
Carburetor – make
Carburetor-size
Method of heating mixture
Make of vacuum tank
Gasoline tank capacity
Fuel feed-type
Air Cleaner
Marvel
1-1/8”
Marvel Heat Control
Stewart
11-1/2 gallons
Vacuum tank
A. C.
EXHAUST
Muffler - make Hudson
Exhaust pipe diameter 2”
IGNITION SYSTEM
Make
Auto-Lite Corporation
Current source
Battery and generator
Spark control type
Full automatic
Firing order
1-5-3-6-2-4
Timing
D. C.
Breaker point gap
.020
Ignition coil-make - Auto-Lite Corporation CE-4015
Spark plug-make
A. C.
Spark plug-type
G 10
Spark plug-size
Metric - 18 m/m, 1.5 m/m thread
Spark plug-gap .
022”
Note: Any other information must be obtained from the manufacturer.
STARTER MOTOR
Make - Auto-Lite Corporation
MAJ-4009
Drive-type
Bendix
No. of teeth on flywheel
107
Width of tooth face
3/8”
Pinion meshes from
Rear of flywheel
Note: Any other information must be obtained from the manufacturer.
GENERATOR
Make - Auto-Lite Corporation
GAM-4102
Normal charging rate - hot
10 Amps.
Normal charging rate-cold
13.5 Amps.
Note: Any other information must be obtained from the manufacturer.
Page 3
Hudson Reference Sheet No. 34 – (January 1931)
Hudson Motor Car Co., Detroit, U. S. A.
BATTERY
Make
Type
Voltage
No. of Plates
Where mounted
Exide
3-Xl-13-1-G
6
13
Under driver's seat
Terminal grounded
Length - overall
Width – overall
Height of box
Height over terminals
Negative
9”
7-1/8”
7-7/8”
9”
LIGHTING SYSTEM
Head and tail lamps - make John Brown Lamp Company
Head lamp reflector - make
Separately
Head lamp - type
Bullet
Side lamp - type
Bullet
Head lamp lens - type
Stabilite
Head lamp lens-diameter 8-1/16”
.
Head lamp dimmer method
John Brown Lamp Company
Separate Filament
Dash and tail lights connected
Ammeter - make
Dash light - make
Lighting switch control
Motometer Gauge & Equip. Co
Motometer Gauge & Equip. Co.
On steering wheel
LAMP BULB SPECIFICATIONS
Head
Side
Tail
Dash
Stop
Dome
Make
Mazda No.
C. P,
Base
Voltage
Mazda
Mazda
Mazda
Mazda
Mazda
Mazda
1110
63
63
63
87
63
21-21
3
3
3
12
3
D. C.
S. C.
S. C.
S. C.
S. C.
S. C.
6-8
6-8
6-8
6-8
6-8
6-8
HORN
E. A. Horn
Motor type
CHASSIS
Wheelbase
Lubricating system
Overall length with bumpers
Location of serial number
110-1/2”
Alemite
174-1/4”
On right hand side member – at rear
end of front spring
.
TRANSMISSION
Make
Location
Speeds
Gear ratio - low
Gear ratio – second
Gear ratio - high
Gear ratio - reverse
Type of lubricant
Oil capacity (approx.)
Pilot bearing in crankshaft
Page 4
Hudson
Unit
3 forward, 1 reverse
2.921 to 1
1.924 to 1
1 to 1
3.469 to 1
Light trans. oil
1-3/4 pounds
N. D. No. 1202
Pocket bearing
Reverse idler
Main shaft - front
Main shaft - rear
Countershaft
Bronze bushing
Bronze bushing
N. D. No. 1207
Hyatt No. N. C. 306
Stationary
Hudson Reference Sheet No. 34 – (January 1931)
Hudson Motor Car Co., Detroit, U. S. A.
CLUTCH
Make
Type
Facing material
No. of cork inserts
Hudson
Throwout bearing
Single disc in oil
Throwout
Cork inserts
Clearance at F/B
88
LUBRICATION – ½ pint light motor oil & 1/8 pint kerosene
Annular & thrust
1/8”
3/4”
UNIVERSALS
Front
Type
Metal
Make
Spicer
Make
Spicer
Rear
Type
Metal
TYPE OF DRIVE
Propulsion through rear springs.
REAR AXLE
Make
Type
Gear ratio
Type of drive
Minimum road clearance
Clearance for jack
Differential - make
Pinion
Pinion bearing
Hudson
Semi-floating
5 4/10 or 5 1/10
Spiral bevel
7-1/2”
9-1/2”
Hudson
Adjustable
Adjustable
Wheel bearing
Timken 415TV and 412A
Pinion bearing - front
Timken 2691V and 2620
Pinion bearing - rear
Timken 3188and 3120
Differential bearing - right Timken 336 and 3320
Differential bearing - left Timken 336 and 3320
No. of teeth in pinion
10
No. of teeth in gear
54 or 51
Oil capacity (approx.)
3 pounds
Type of lubricant
Differential oil
FRONT AXLE
Make
Section - type
End - type
King pin thrust bearing
King pin transverse
inclination
Hudson
I beam
Rev. Elliott
Ball bearing
Toe in
Castor angle
Minimum road clearance
Clearance for jack
Spindle transverse
inclination
7º
Zero to 1/8”
1º
8”
8”
1º
STANDARD BRAKES
Type
Bendix 4-wheel
SERVICE BRAKES
Location
Make
Type
Total braking area
Drum diameter
Front and Rear wheels
Bendix
Internal
147 sq. inches
11”
Lining length per wheel; 2 pieces, 24-1/2”
Width of lining
1-1/2”
Thickness of lining
5/32”
Clearance of lining
.010”
Method of application
Foot pedal
HAND BRAKE
The hand lever operates the front and rear wheel brakes independently of the foot pedal, and should be used for parking,
especially when car is standing on an incline.
Page 5
Hudson Reference Sheet No. 34 – (January 1931)
Hudson Motor Car Co., Detroit, U. S. A.
WHEELS
Type
Make
Wood-steel felloe
Motor Wheel Corporation
Front wheel inner bearing
Front wheel outer bearing
Timken No. 2554 and 2520
Timken No. 2382 and 2320
RIMS
Type
Make
Split
Jaxon
Diameter
Width
19”
4”
TIRES
Size
Make
Number of plies
Recommended pressure
29” x 5 balloon, straight side
Goodyear
4
Front 40 lbs., rear 40 lbs.
STEERING GEAR
Make
Type
Ratio
Steering wheel turns
Turning radius
Lubricant
Gemmer
Worm and sector
15 to 1
2-1/2 (full swing left to right)
20 feet
Steam cylinder oil
SPRINGS
Front Spring
Type
Length
Width
No. of leaves
Material
Front bushing
Rear bushing
Bushing material
Shackle type
Semi-elliptic
36”
2”
8
Alloy steel
5/8” diameter
5/8” diameter
Phosphor bronze
Adjustable
Rear Spring
Type
Length
Width
No. of leaves
Material
Front bushing
Rear bushing
Bushing material
Semi-elliptic
54-1/8”
2”
7, 8 or 10
Alloy steel
5/8” diameter
5/8” diameter
Phosphor bronze
FRAME
Make
Material
Depth
Page 6
Hudson
Steel
6-15/16”
Thickness
Width of flange
1/8”
2”
Hudson Reference Sheet No. 34 – (January 1931)
Hudson Motor Car Co., Detroit, U. S. A.
ESSEX SUPER SIX
Gear Ratios and Rules for Comparing Speed
in Miles per Hour with Motor R. P. M.
TO OBTAIN MOTOR R. P. M. FOR ANY DESIRED SPEED IN
MILES PER HOUR
Multiply the car speed in miles per hour by the “ Conversion Factor” corresponding to the
rear axle ratio with which the car is equipped. (See Conversion Table for “ Conversion Factor” ).
Example - What is the motor R. P. M. when an Essex Super Six equipped with 5.4
to 1
rear axle ratio is traveling at a speed of 40 miles per hour.
“ Conversion Factor”
for 5.4 to I rear axle ratio 62.5 (See Conversion Table).
Answer - 40 multiplied by 62.6 =2500 R. P. M. (approximately).
TO OBTAIN CAR SPEED IN MILES PER HOUR FOR A GIVEN MOTOR
SPEED IN R. P. M.
Divide the motor R. P. M. by the “ Conversion Factor” corresponding to the rear axle
ratio with which car is equipped. (See Conversion Table for “ Conversion Factor” ).
Example - What is the car speed of an Essex Super Six with 5.1 to 1 rear axle ratio
when the motor is turning at 2400 R. P. M.
“ Conversion Factor” for 5.1 to I rear axle ratio 59.0 (See Conversion Table).
Answer - 2400 divided by 59.0 = 40.7 Miles per Hour (approximately).
CONVERSION TABLE
(Cars equipped with 29' Tires)
Conversion Factor
59.0
62.5
Rear Axle Ratio
5.1
5.4
Gear Ratio - To obtain the number of revolutions of the motor required for one revolution of
the rear wheel, multiply the rear axle ratio by the ratio of the transmission in the gear desired.
Example - How many revolutions does the motor make for one revolution of the rear
wheels with a car equipped with 5.4 to 1 rear axle with the transmission in low gear?
Answer - 2.921 (low gear ratio) x 5.4 (rear axle ratio) = 15.773 revolutions of motor to one
revolution of rear wheels.
The following tabulation shows the various motor to wheel ratios worked out as above for
Essex Super Six cars with 5.4 to 1 rear axle ratios:
Transmission
Gear
Revs.
Low
Second
High
Reverse
Transmission
Ratio
Rear
Axle Ratio
2.921
1.924
1.
3.469
5.4
5.4
5.4
5.4
Motor
Revs.
15.773
10.390
5.4
18.732
Wheel
1
1
1
1
Page 7
Hudson Reference Sheet No. 34 – (January 1931)
Hudson Motor Car Co., Detroit, U. S. A.
REVISED JANUARY, 1931
Essex Super Six – Standard Equipment
Cowl lights
Cowl ventilator
Dome light
Gasoline and oil level gauge Electric - on instrument board
Headlamps-John Brown Lamp Co. - Stabilite
Heat Indicator-On instrument board
Horn-E. A. motor driven
Ignition lock-Electrolock
Rear Traffic Signal - John Brown Lamp Co
Shock absorber-Monroe Two Way Hydraulic
Spare Rim-One
Speedometer-Stewart-Warner
Storage Battery-Exide
Sun visor
Tire carrier-Rear
Tire Carrier-On Fender
Wheels--Wood
Windshield cleaner--Trico vacuum
ALL MODELS
ALL MODELS
ALL CLOSED MODELS
ALL MODELS
ALL MODELS
ALL MODELS
ALL MODELS
ALL MODELS
ALL MODELS
ALL MODELS
ALL MODELS
ALL MODELS
ALL MODELS
ALL CLOSED MODELS
ALL MODELS EXCEPT SPORT ROADSTER
SPORT ROADSTER
ALL MODELS
ALL MODELS
EXTRA EQUIPMENT
Bumpers ---Front and rear
Tire Cover
Page 8
ALL MODELS
ALL MODELS
Hudson Reference Sheet No. 34 – (January 1931)
Hudson Motor Car Co., Detroit, U. S. A.
REVISED JANUARY, 1931
Essex Super Six - Body Details
1931 Models
Std.
Sedan
Coach
Rumble
Coupe
2-Pass.
Coupe
Sport
Roadster
Touring
Sedan
Wheelbase
113
113
113
113
113
113
No. of doors
4
2
2
2
2
4
No. of passengers
5
5
4
2
4
5
Seating arrangement
Std.
Std.
Std.
Std.
Std.
Std.
Gear ratios
5 4/10
5 4/10
5 1/10
5 1/10
5 1/10
5 4/10
Windshield-type
One piece swing type
ALL MODELS
Windshield - make
Motor Products
ALL MODELS
Wheels - type
Wood
ALL MODELS
Tires - size
19 x 5.00
ALL MODELS
Weight
2750
2690
2645
2595
2400
2815
Page 9