Yes this is a working combustion engine!Using the cannon part, I came up with the idea to use cannons instead of the pistons to make a working engine! It took a little work to make the first prototype but now I have the 4 cylinder or the first model and the the 8 cylinder the newer model I was planning on making a v-8 engine but I do not have the time to work on it or any of the other ones for that matter so instead of letting these ideas go to waste I thought it would be better to post it and let other builders try to put these engines to their test, or just make their own engines using the cannon method.A little on how they work.This does use the funky tree code / variables to make the engine run.How the code works is that it checks the rotator position and will only let the cannon fire if it is between the key position example: BRP<50.0 & BRP>-45.0The suspension is acting as a sliding track to hold the cannons in line.The 4 cylinder model is set to air to ground and uses the funky tree in the cannons activation group to tell the position of the rotator and the rotator is set to output the BRP, or Bar Rotation Position to the cannon, note BRP is just what I called it.While the 8 cylinder model is set to air to air and uses more of the variables and less of activation group to tell the bar position this is almost the same as the 4 cylinder it just is easier to adjust it, note the arm group does not matter it just so I could test both engines separately. I was planning on making a speed sensor so I could tell how fast the engine was going and so the engine could change when the cannons fire to get the maximum speed and strength but as I said no time and I am not that familiar with the funky tree but I would love to see if anyone else could do these thing.And most importantly leave me some credit if you use this idea and if you have any questions or you have made something using this please let me know in the comments down below!