In 1911, the company introduced its first six-cylinder engine. Two more cylinders were added to the basic Type 5 / Type 10 motor. Although bore and stroke remained unchanged at 5-1/2 by 6 inches (ca. 15 cm), horsepower was increased to 100 – powerful enough to drive an 800 gpm gear pump.
The first Type 12 (1911-1925) pumper was delivered to West Orange, New Jersey, later that year. The Type 12s pumping capacity was later increased to 900, then 1000 gpm. The second decade of the new century was one of furious product development and innovation at American LaFrance.
By 1915 the Elmira, New York, factory was turning out a complete range of motor-driven fire apparatus including rotary gear, piston and centrifugal pumpers of from 250 to 1,400 gallons-per-minute, chemical engines, hose wagons and speedy salvage and rescue squad cars. For the Submarine Boat Co. were made 2 pcs of Type 20 with 65 hp engine.
- Type 45 had 750 gpm rotary pumper and hoses.
- Type 75 (1915-1927) was one of the most popular model of American LaFrance of those time and had 750 gpm rotary pump.
- Type 48 was between Type 40 and Type 75, and had a 75-hp six-cylinder machine with a 600-gpm pump.
- The Types 34 and 35 with 120 horsepower engine were equipped with piston 900 gpm and centrifugal 800-850 gpm pumps, respectively.
- The Type 38 with 6-cylinder 75 hp engine received 650 gpm rotary pump.
- Type 42 was a triple combination with a rotary 800 gpm pump.
- Type 43 was a triple combination with a piston 750 gpm pump.
- Type 44 had centrifugal 900 gpm pump, water tank and was equipped with 120 hp engine.
- Type 47 is a service truck with 75 hp engine and 600 gpm rotor pump.
- Type 53 was a triple combination with 120 hp engine and 800 gpm rotary pump.
- Type 55 was the same model, but with 1000 gpm rotary pump.
- Type 56 had a 105 hp engine and 750 gpm piston pump.
- Type 69 with 105 hp engine was equipped with 600 or 800 gpm, or even 1000 gpm pump. Type 70 (1925) was a service truck with double bank.
- Type 80 (1919) was built on the chassis of Type 45, but had squirrel-tail suction.
- Type 82 (1922) was almost the same as Type 48.
- Type 85 (1916) was a triple combination with 800 gpm rotor pump.
- Type 90 (1919) was a modified variant of Type 80 with less road clearance.
Successor: American LaFrance 100 Series Metropolitan