Gears and transmission
500cc Two-Stroke Engine - Exploded Sub-Assemblies
- Bounding box
- 3733.0 × 151.8 × 327.0 mm
- Engine
- Precision B-rep
- Parameters
- 25
- Published
- October 23, 2026
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The prompt
Create a complete, mechanically assembled 3D CAD model of a 500 cc single-cylinder two-stroke engine. **Main dimensions:** - Bore: 90 mm - Stroke: 78.59 mm - Crank radius: 39.295 mm - Connecting rod length: 150 mm (provisional) - Vertical cylinder, crankshaft mounted horizontally below it. **Main components:** Model the cylinder liner, piston, piston rings, wrist pin, connecting rod, crankshaft, two-piece crankcase, cylinder head, bearings, seals, fasteners and mounting brackets as separate parts. **Air and exhaust system:** Use an external mechanically driven compressor to supply fresh air through a separate duct to a piston-controlled inlet port. The crankcase must not be used as a scavenging pump. Place a rotating rotary valve directly at the exhaust outlet. The valve must open and close the exhaust passage and be driven from the crankshaft by a toothed belt and pulleys. Include the valve shaft, housing, bearings and belt tension adjustment. **Fuel and lubrication:** Place a direct fuel injector and spark plug in the cylinder head, pointing into the combustion chamber. Include a separate pressure-fed lubrication system with oil sump, pickup, oil pump, filter, oil galleries, bearing feeds and oil-return passages. **Assembly and movement:** Connect all components using realistic CAD mates. The piston must move vertically while the crankshaft rotates. The connecting rod must pivot correctly. The exhaust rotary valve and compressor must rotate through their respective mechanical drives. Check clearances through a complete crankshaft revolution and detect collisions. **Gas exchange:** During scavenging, the compressor pushes fresh air through the cylinder while the exhaust rotary valve is open. During compression, the inlet and exhaust paths must close appropriately. Fuel is injected directly into the combustion chamber after the gas-exchange paths are sufficiently closed, followed by ignition. **Deliverables:** Generate the complete assembly, separate editable parts, exploded view, sectional views, parts list, basic dimensions and a STEP export if supported. Mark uncalculated dimensions, valve timing, belt ratios, compressor specifications, clearances and material choices as provisional. Do not invent validated values or claim the design is production-ready. Preserve the specified architecture and do not replace the exhaust rotary valve with a conventional valve.
Parameters
| Name | Value | Range |
|---|---|---|
| Cylinder Bore | 90 mm | 60 – 120 |
| Stroke | 78.59 mm | 50 – 110 |
| Crank Radius | 39.3 mm | 25 – 55 |
| Con-Rod Length (c-c, provisional) | 150 mm | 110 – 200 |
| Exploded Layout Gap | 60 mm | 10 – 200 |
| Liner Wall Thickness | 8 mm | 4 – 16 |
| Liner Height | 150 mm | 100 – 220 |
| Inlet Port Width | 40 mm | 15 – 60 |
| Inlet Port Height | 30 mm | 10 – 50 |
| Exhaust Port Diameter | 32 mm | 16 – 50 |
| Cylinder Head Height | 40 mm | 20 – 70 |
| Combustion Chamber Depth | 14 mm | 5 – 30 |
| Injector / Plug Angle | 30 deg | 10 – 60 |
| Piston Height | 55 mm | 35 – 80 |
| Wrist Pin Diameter | 22 mm | 12 – 32 |
| Crankpin Diameter | 30 mm | 18 – 45 |
| Main Journal Diameter | 32 mm | 20 – 50 |
| Crankcase Wall Thickness | 8 mm | 4 – 16 |
| Rotary Valve Disc Diameter | 34 mm | 20 – 60 |
| Crankshaft Pulley Diameter | 60 mm | 30 – 110 |
| Rotary Valve Pulley Diameter | 30 mm | 16 – 60 |
| Compressor Pulley Diameter | 40 mm | 20 – 80 |
| Compressor Body Diameter | 50 mm | 30 – 90 |
| Intake Duct Diameter | 26 mm | 12 – 50 |
| Oil Filter Diameter | 50 mm | 25 – 90 |
Every value above is a live dimension. Open a model like this in the editor and each one becomes a slider you can drag before exporting.
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