Mechanical parts
Four-Stroke Gasoline Piston, 86 mm Bore
- Bounding box
- 86.1 × 86.1 × 60.1 mm
- Engine
- Precision B-rep
- Parameters
- 18
- Published
- October 17, 2026
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The prompt
Create a detailed 3D model of a four-stroke gasoline engine piston, designed as a realistic mechanical component. REFERENCE DIMENSIONS — millimeters Outer piston diameter: 86 mm Overall piston height: 60 mm Crown: flat circular top surface Upper compression ring groove: 1.2 mm wide, positioned 6 mm below the crown Second compression ring groove: 1.5 mm wide, positioned 9 mm below the crown Oil control ring groove: 3 mm wide, positioned 13 mm below the crown Wrist-pin bore: 22 mm diameter, passing horizontally through both internal pin bosses Wrist-pin axis: 30 mm below the crown GEOMETRY Create a cylindrical aluminum piston with a flat crown, three continuous circumferential ring grooves, a slightly tapered skirt, and realistic internal pin bosses. The underside must be hollow and must include structurally plausible internal support ribs. The wrist-pin bore must be aligned across both pin bosses and must remain open through the component. Keep the ring grooves evenly circumferential and geometrically clean. Preserve the specified dimensions and relative positions. Do not add bolts, connecting rods, rings, text, logos, or unrelated parts. MESH REQUIREMENTS Generate clean geometry with smooth curved surfaces, sharp and well-defined groove edges, sufficient polygon density, and no overlapping surfaces. Keep the piston as one coherent, closed mesh wherever the physical geometry permits. Create a separate isolated view of the component. The model is for visual prototyping and 3D-printing experimentation, not a certified functional engine replacement. Do not claim OEM-level accuracy. Dimensions and clearances must be verified in CAD before manufacturing.
Parameters
| Name | Value | Range |
|---|---|---|
| Outer Diameter | 86 mm | 50 – 140 |
| Overall Height | 60 mm | 35 – 110 |
| Crown Thickness | 10 mm | 4 – 22 |
| Skirt Wall Thickness | 5 mm | 3 – 12 |
| Skirt Taper (radial) | 1 mm | 0 – 3 |
| Ring Groove Depth | 2.5 mm | 1 – 4 |
| Top Compression Ring Width | 1.2 mm | 0.8 – 3 |
| Top Ring Below Crown | 6 mm | 3 – 14 |
| Second Compression Ring Width | 1.5 mm | 0.8 – 3 |
| Second Ring Below Crown | 9 mm | 4 – 20 |
| Oil Control Ring Width | 3 mm | 1.5 – 5 |
| Oil Ring Below Crown | 13 mm | 6 – 28 |
| Wrist-Pin Bore Diameter | 22 mm | 12 – 34 |
| Pin Axis Below Crown | 30 mm | 15 – 45 |
| Pin Boss Column Diameter | 44 mm | 26 – 62 |
| Support Rib Count | 4 ea | 0 – 8 |
| Rib Width | 6 mm | 3 – 12 |
| Rib Height | 38 mm | 10 – 44 |
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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