Stefan Gasparin, of Czech Republic, began building CO2 engines in 1972. He designed and built over 60 variations from 1 through 18 cylinders including single-cylinder, inline, opposed flat, “V,” rotary, and radial configurations. He was registered in the Guinness Book of World Records in 1989 for producing the world’s smallest CO2 engine.

The G24NN two-row 18-cylinder radial engine features a bore in each cylinder of 3.175mm and the stroke is 3mm. It weights 53 grams. Only 19 of these engines were built before the company was closed in 2006. This one (#20), was custom built by Mr. Gasparin just for Paul Knapp’s Miniature Engineering Museum in 2011.

All three of Mr. Gasparin's small CO2 engines are on custom wooden stands with a pressure tank mounted to the base.
All three of Mr. Gasparin’s small CO2 engines are on custom wooden stands with a pressure tank mounted to the base.

Exhibit added: October 1, 2011 - Last modified: February 1, 2023

Presented by The Joe Martin Foundation for Exceptional Craftsmanship