Engine Turbocharged 4-Cylinder working belt driven Model - Easy Print

thingiverse

Hi there! Welcome to my second large-scale project! **Do you hate models that are a nightmare to print? Because I do!** Easily printable models is an attribute that I want my name to stand for! I designed this engine model from scratch and kept 3d-printing in mind during every design step. Therefor everything prints very easily, no need to generate supports. The parts that need supports have them integrated directly in the models. I chose the layer orientation of the parts to reduce friction, as I wanted it not only to look cool. With the hand-crank the engine spins very easily and I could sit there and watch the parts moving for ages! I am really happy with the result, and I am sure you will appreciate my work! After all, designing this took waayyy too long, but the outcome is incredibly satisfying! You are planning to make one? Awesome! Dont forget to share it with us! **Highlights:** - mechanically working model - designed from scratch with 3d-printing in mind - all parts printable without figuring out supports - easy assembly and disassembly, no glue or screws - great to show how an engine cycle works - turbo can spin (with enough airflow, not through normal operation) - all parts oriented correctly out of the box - insert electric motor in starter case to power the engine without handcrank - huge explosion diagram https://i.imgur.com/wy98hDl.jpg But see for yourself: https://www.youtube.com/watch?v=YMe8UYA_d_Y **Aww man, I dont have flexible filament!** Dont worry, I got you covered! I made a remixed version that is driven by gears instead of a belt. Works almost as good as this one! Otherwise this may be an opportunity to try out flexible filament. I got one with hardness 85A, which is relatively soft, from a brand called "Pxmalion". Cheap and worked perfectly for me. **I dont have that particular electric motor...** Not sure if this is a standard size, but I had it laying around. The drawing should help you to find the right one. The belt-driven engine needs the starter motor to tension the belt. If you dont have the electric motor, simply print the dummy gear part. If you want to turn the engine through the hand crank, do the same. The gear ratio is around 17.4 which makes it very hard to turn when the motor is not powered. **I had one single goal when I decided to start this project:** I did not want to simply design an engine, I wanted to have a turbocharger mounted to it with all the pipes form exhaust to intake. The turbo should prove, that the entire mechanical system with the valves works, by spinning when the engine revs high enough. Well, it did not exactly spin fast, but the direction of rotation was correct and the engine was not fully optimized yet (had no bearings on the crankshaft and it partially melted due to friction). This was enough proof for me, as I calculated the revs and came to the result that I tested it around 2000rpm. For real cars this is approximately the speed at which the turbo starts whistling, while additionally my turbo only gets fed by the exact displacement volume of every cylinder, whereas on a real engine the that volume is much greater than the actual displacement due to the gas expansion during the ignition. If you really want to know yourself, feel free to print the parts labeled with "_tight" (tighter, but increased friction, not meant for use other than testing purposes). With proper lubrication I am sure you can get some results. If you try, let me know! I am curious about that. Happy Printing! ~Steiner3D