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Antique Engine Database
Chicago Pneumatic Tool Company
In 1915, Chicago Pneumatic Tool Co. placed a two-cycle oil engine on the market. Single-cylinder engines were built in sizes from 12 to 45 horsepower – double-cylinder air models were available up to 90 horsepower size. Intake air was first drawn into the crankcase. On the return stroke of the piston, the crankcase pressure rose to 6 PSI. As the bottom cylinder port opened this pressurized air rushed into the cylinder and was then compressed to 150 PSI prior to fuel injection.
history
As late as 1935 Chicago Pneumatic was building engines from 80 to 600 horsepower in units of four to six cylinders. This well-known manufacturer of air compressors and electric and pneumatic tools also got into the truck business. In 1910, it was marketed under the name “Duntley” a 3/4-ton delivery truck powered with its own 2-cylinder air-cooled opposed engine of 20 horsepower. The Duntley was on the market until 1912 when the company came out with a new line of light trucks under the name “Little Giant”. These were on the market through 1918 but were powered by Continental engines. A limited run of passenger cars was also made during this time, bearing the names “Chicago” and “C.P.T” The company still exists, but no longer builds engines or motor vehicles.
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