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1904 CADILLAC Cadillac Index
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.

1904
Cadillac runabout with tonneau

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.


1904 Cadillac Model B 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.

1904 Cadillac Model B 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.


Model A
Model No. Body type Seating Price Weight
N/ARunabout2$7501370 lb
N/ARunabout with Tonneau4$8501450 lb
N/ADelivery2$8501525 lb
Model B
Model No. Body type Seating Price Weight
N/ARunabout2$8001300 lb
N/ATouring4$9001420 lb
N/ASurrey4$9001400 lb
N/ADelivery2$9001525 lb


1904 Cadillac Model B runabout

ENGINE
Engine typeHorizontal single-cylinder with cylinder facing to the rear.
Engine compositionCast iron cylinder, with copper water jacket
Bore and stroke5.00 x 5.00 in. (127mm x 127mm)
Capacity98.2 cu. in. (1.6 liters)
Brake H.P.8.25
Main bearingsTwo
Valve liftersMechanical
CarburetorUpdraft mixer, manufactured by Cadillac


MODEL A CHASSIS
Wheelbase72 in. (1.8 meters)
Overall length111 in. (2.82 meters)
Height5 ft. (1.5 meters)
Front/Rear Tread54.5 in. (1.28 meters) (60" (1.5 meters) optional)
Tires28 x 3" (711 mm x 76 mm) Clincher
MODEL A DELIVERY CHASSIS
Wheelbase72 in. (1.8 meters)
Overall length111 in. (2.82 meters)
Height7 ft., 1 in. (2.2 meters)
Front/Rear Tread54.5 in. (1.28 meters)
Tires28 x 3 (711 mm x 76 mm)Clincher
MODEL B CHASSIS
Wheelbase76 in. (1.9 meters)
Overall Length112 in. (2.85 meters)
Height5 ft. (1.5 meters)
Front/Rear Tread54.5 in. (1.28 meters)
Tires30 x 3 (762 mm x 76 mm) Clincher.
MODEL B DELIVERY
Wheelbase76 in. (1.9 meters)
Overall Length112 in. (2.85 meters)
Height: Approx.7 ft. (2.1 meters)
Front/Rear Tread54.5 in. (1.28 meters)
Tires30 x 3.5" (762 mm x 89 mm) Clincher.


TECHNICAL
TransmissionPlanetary Transmission
Speeds2 Forward and 1 Reverse (3:1 low, 1:1 high)
DriveChain
DifferentialSpur gear
Overall ratio3.1:1 to 5:1
BrakesMechanical on two rear wheels — contracting on inboard drums
Wood wheels12 spoke
Model A Wheel size22 in. (559 mm)
Model B Wheel size24 in. (610 mm)
Delivery Wheel size23 in. (584 mm)
Drivetrain OptionsDifferent 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


NEXT: History of the 1905 Cadillac

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1903 1905 1906 1907 1908 1909 1910 1911 1912 1913 1914 1915 1916 1917 1918 1919

Caddy Index

June 18, 2000; Feb 7, 2001; March 8/03

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