Miniature V4 engine by dickinohio. 5:54 video.
https://www.youtube.com/watch?v=ALL-oLq9zeY
Previously:
https://www.homemadetools.net/forum/...131#post138215
https://www.homemadetools.net/forum/...901#post137416
https://www.homemadetools.net/forum/...873#post137314
https://www.homemadetools.net/forum/...687#post178488
https://www.homemadetools.net/forum/...088#post157364
https://www.homemadetools.net/forum/...828#post175237
