This small compressor isn't very powerful, with a 0.5 hp motor that reaches just 0.7 CFM at 90 PSI, and its 1-gallon tank takes about a minute to fill. It is, however, extremely quiet. At just 57 ...

However, with the right mods, it’s possible to turn one into a functioning internal combustion engine. The build starts by disassembling the compressor ... tubing and a small square section ...