In 1904, Cadillac offered two models. The Model A was a continuation of the 1903. It had a delivery body with detachable top. Horsepower increased to 8.25. Clincher tires became standard equipment. An optional 60 inch tread was available. A pressure fed multiple oiler was introduced.
The Model B was the same as the Model A except the chassis had a pressed steel frame and axles. It featured front axle girder style (which was not available in the wide tread option) and single transverse half-elliptic front spring. Cranking (counterclockwise) was only on the left side; but a decompression device was provided to facilitate cranking. A safety device was introduced to prevent the crank from being inserted when the spark control lever was in the advanced position. Horsepower rating increased to 8.25; but this was more an issue of confidence in the engine rather than any engine design changes.
The body of the Model B was an inverted box rather than the sloping, curved dash. The radiator was vertical and below frame instead of the front mounted sloping unit on the Model A. A joint in body at dash allowed the body to be slid off without lifting. A surrey body style was added with a side entrance detachable tonneau. The delivery top was no longer detachable. The weight of all body styles was reduced by as much as 70 pounds. Prices increased $50. When the street was muddy, cars with rear entrance tonneau were backed in perpendicular to the sidewalk so passengers did not have to walk in the mud. The side entrance surrey ended this inconvenience.
Once again serial numbers were not used for Model A or B. The engine numbers were stamped two places on crankcase: top, right edge of cylinder flange, near the water outlet; and right, front face, just below top cover. The blank spaces on patent plate was for additional patent dates, not engine number. Model A engine numbers ranged from 3500 to 4018. Model B numbers were 2500 to 3500.
STYLE: MODEL A
Model No.
Body type
Seating
Price
Weight
N/A
Runabout
2
$750
1370 lb
N/A
Runabout with Tonneau
4
$850
1450 lb
N/A
Delivery
2
$850
1525 lb
STYLE: MODEL B
Model No.
Body type
Seating
Price
Weight
N/A
Runabout
2
$800
1300 lb
N/A
Touring
4
$900
1420 lb
N/A
Surrey
4
$900
1400 lb
N/A
Delivery
2
$900
1525 lb
ENGINE
Engine type
Horizontal single-cylinder with cylinder facing to the rear.
Engine composition
Cast iron cylinder, with copper water jacket
Bore and stroke
5.00 x 5.00 in. (127mm x 127mm)
Capacity
98.2 cu. in. (1.6 liters)
Brake H.P.
8.25
Main bearings
Two
Valve lifters
Mechanical
Carburetor
Updraft mixer, manufactured by Cadillac
MODEL A CHASSIS
Wheelbase
72 in. (1.8 meters)
Overall length
111 in. (2.82 meters)
Height
5 ft. (1.5 meters)
Front/Rear Tread
54.5 in. (1.28 meters) (60″ (1.5 meters) optional)
Tires
28 x 3″ (711 mm x 76 mm) Clincher
MODEL B DELIVERY CHASSIS
Wheelbase
72 in. (1.8 meters)
Overall length
111 in. (2.82 meters)
Height
7 ft., 1 in. (2.2 meters)
Front/Rear Tread
54.5 in. (1.28 meters)
Tires
28 x 3 (711 mm x 76 mm)Clincher
MODEL B CHASSIS
Wheelbase
76 in. (1.9 meters)
Overall Length
112 in. (2.85 meters)
Height
5 ft. (1.5 meters)
Front/Rear Tread
54.5 in. (1.28 meters)
Tires
30 x 3 (762 mm x 76 mm) Clincher.
MODEL B DELIVERY
Wheelbase
76 in. (1.9 meters)
Overall Length
112 in. (2.85 meters)
Height: Approx.
7 ft. (2.1 meters)
Front/Rear Tread
54.5 in. (1.28 meters)
Tires
30 x 3.5″ (762 mm x 89 mm) Clincher.
TECHNICAL
Transmission
Planetary Transmission
Speeds
2 Forward and 1 Reverse (3:1 low, 1:1 high)
Drive
Chain
Differential
Spur gear
Overall ratio
3.1:1 to 5:1
Brakes
Mechanical on two rear wheels — contracting on inboard drums
Wood wheels
12 spoke
Model A Wheel size
22 in. (559 mm)
Model B Wheel size
24 in. (610 mm)
Delivery Wheel size
23 in. (584 mm)
Drivetrain Options
Different combinations of 9 or 10 tooth driving sprocket with 31, 34, 38, 41, or 45 tooth driven sprocket gave ten possible ratios from 3:1 to 5:1.
The transmission had two forward speeds (3:1 and 1:1) and one reverse with a disc clutch and chain drive. The overall ratio was 3.1:1 to 5:1 depending on the combination of the size of the sprockets. The drive sprocket had 9 or 10 teeth and the driven sprocket had 31, 34, 38, 41, or 45 teeth. The lower ratios were used on the runabouts used on smooth, level roads; but the higher ratios were used on hilly roads and for delivery vehicles. Owners were instructed how to change the sprockets, but it involved the disassembly of the transmission and rear axle — hardly a job for the average motorist.
MODEL A OPTIONS
Tonneau
$100.00
Leather top with side curtains and storm apron
$50.00
Rubber top ;with side curtains and storm apron
$30.00
Lights
—
MODEL B OPTIONS
Bulb horn, lights, leather top with side and storm apron
$50.00
Rubber top with sides and storm apron
$30.00
Deck to replace tonneau on Touring or Surrey
$10.00
HISTORICAL NOTES
The Model B was introduced in January, 1904.
Calendar year sales and production for both Model A and B totalled 2,319.
The president of Cadillac continued to be C. A. Black.
The factory burned in the Spring of 1904, reducing capacity to almost nothing for 45 days.
Deposits on 1500 orders were returned to prospective customers.
However, the volume of sales still exceeded those of any other make in the country.