This engine is constructed with 3D printed parts. It is designed using Autocad 123D and printed on an Ender-2. The solenoids are Arduino controlled, with Hall sensor crankshaft position pick up. Main power to the solenoids is switched with MOSFET's in the 'cilinderheads'. It has an auto-start sequence, and speed is controled with a 'gas pedal' in the panel. The crankshaft took two attempts. The first one was completely 3D printed, but turned out to wobbely. The second, still printed side pieces but now with brass shafts and pinn's, was succesfull.
Parts used:
8x JF-0530B 12V solenoids
2x Arduino Nano (1 dedicated sensor read and timing control, 1 for the display's)
1x ACS712 Amp sensor
4x SS461A latching Hall sensor
8x LR7843 MOSFET's
8x SS310 Diode
2x TM1637 LED display 4 digit
6x bearing 9x5x3mm (crankshaft)
8x bearing 7x4x2.5mm (connecting rods)
5x M8 nut (flywheel weight)
1x Oak wood base
Several pieces universal PCB board and connectors
Various resistors, wiring, M3 Allen bolts,
3D Printed parts:
Engine housing
Crankshaft (connected with brass shafts and pins)
Connecting rods
'Piston' connectors
Sensor parts
Cilinder heads (MOSFET covers)
Flywheel
Panel
Throttle pedal
Detailed buildlog available at Modelbouwforum.nl: www.modelbouwforum.nl/threads... . This is In Dutch, but with lots of pictures.