[12] Air Pressure Engine (Pneumatic) - 6 cylinder (axial) - 409 ccm

thingiverse

This is an axial engine model with 6 cylinders.Warning:Due to the high displacement you'll need a huge compressor. Otherwise it may only spin at low speeds. (Example: 300 rpm × 409 ccm × 2 strokes per revolution ≈ 245 liter/min).Note:The exploded view of the engine is not quite correct. The O-ring should be inserted into the cylinder head and not directly onto the valves.Specs:Version: 12Type: axial 6 - two strokeDisplacement: 409 ccm (68 ccm per cylinder)Materials:PETG → piston ringsTPU → head sealsPLA → all other partsParts:Bearings (inner diameter x outer diameter x width)4x 25x37x7mm 4x 15x21x4mm18x 6x17x6mmO-Rings (inner ø x width)12x 10x2mm (valves)12x 8x2mm (valve caps)Springs (inner ø x outer ø x height)12x 6.5x10mm (max: ø7.5mm | solid height min: 4mm)Fittings1x 1/4" pneumatic fittingScrews (M3 socket screws)6x 6mm (flywheel mass)6x 8mm (exhaust)10x 12mm (crankcase, camshaft)12x 14mm (piston rods)6x 16mm (piston rods)6x 18mm (crankcase cover)1x 20mm (camshaft)1x 25mm (flywheel)30x 30mm (cylinder head, valves, pistons)Some screws can be a bit shorter/longer. Please check the dimensions using your CAD software. I'd recommend buying a set of these screws.Insertsmin. 54x M3 threaded insert (max. height: 6mm)