My friend personal design and make one four-cylinder engine. How to make it? Its very details from the beginning. The video will show how he make all the parts by his idea. How he managed to get some parts. He will test the engine in this video. This is part 1. I got the feedback for the part 1 video i posted last time. It was very confused because of the fast forward . I edited again . and this video look better. You can leave a comment There is part 2 of how he assemble the engine. click the l