Why does my pneumatic engine run slower?

The first 20 seconds of the video show a four-cylinder engine that I designed myself, incorporating some inspiration and design elements from YouTube. The final 20 seconds show a single-cylinder engine built by closely following a tutorial. Why does the four-cylinder engine run significantly slower than the single-cylinder engine when both are supplied with similar air pressure (approximately 30 psi)? submitted by /u/Takadoo75 [link] [comments]