After an inauspicious trial in the luxury car field, and recognizing the disappearing market for the single cylinder cars which made their reputation, Cadillac settled down with a design which had originated in 1906 (the 1907-1908 Model G). With in-house mass production of a single line, Cadillac was able to offer a high quality automobile at a moderate price: $1400 for the Model “Thirty” as compared to $2000 for the Model G.
Cadillac offered three models: 2-door Touring 5-passenger; 2-door Demi-Tonneau 4-passenger; and Roadster 3-passenger. The “Thirty” differed from the Model G as follows:
No closed bodies were offered. A detachable tonneau was once again available. It also had steel doors and cowl on the roadster and Demi-tonneau. Flared, twisted front fenders replaced the bulky flat fenders with filler between the fender and frame. Full running boards and running board dust shields were available on all bodies. There were no louvers in the hood. The bodies were finished (painted) by Cadillac
3/4 platform rear spring system. Single dropped frame. Wheelbase lengthened to 106 in. In mid-year, brake drum diameter was increased to 12 in.
Transmission refined and mounted at three points to frame cross members rather than at the four points to frame side rails. Universal joint was housed in the ball joint at rear of the transmission. Rear axle with bevel gear differential made by American Ball Bearing
Drive for water pump (gear type) and oiler changed from external belt to internal gears. Gear driven accessory shaft allows for optional magneto. Speed governor no longer used.
I. D. DATA
Serial numbers were located on a plate on the rear of the body or on the dash (with the engine no.). Engine numbers were stamped on top surface of crankcase — in front of and to the left of the number one (front) cylinder. Starting: 32002. Ending 37904.
Vertical in-line, L-head. Four cylinder. Individual cast iron cylinder, copper water jacket
Bore & stroke
4.00″ x 4.50″ (101.6mm x 114.3mm)
226.2 cubic inches (3.707)
30 A.L.A.M.; 25.6 Advertised H.P.
Five main bearings
Mechanical push rod roller cam followers
Float feed carburetor made by Cadillac.
56 in. (61″ opt.)
32 x 3-1/2.
Selective sliding gear transmission
3 Forward/1 Reverse
Right hand drive, controls to right
Leather faced cone clutch
Plain live rear axle, bevel drive; bevel gear differential
Touring and Demi-Tonneau = 3.50:1; Roadster=3.00:1
Optional Final drive ratios
3.00:1, 3.50:1, 4.00:1
Mechanical brakes on two wheels — service/foot/contracting — emergency/lever/expanding