Brackets and mounts
2-Stroke Engine Crankcase Left Half
- Bounding box
- 160.0 × 142.0 × 140.0 mm
- Engine
- Precision B-rep
- Parameters
- 30
- Published
- September 19, 2026
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The prompt
Mechanical parametric 3D CAD model of a 2-stroke engine crankcase (left half). Clean engineering B-Rep geometry with flat faces, sharp edges, and exact technical features, suitable for STEP export. Main specifications: 1. Crankcase chamber: internal diameter 106mm, depth 24.05mm. 2. Main hub: bearing bore diameter 72mm (depth 19mm), oil seal counterbore diameter 40mm (depth 7mm), shaft through-hole diameter 32mm. 3. Cylinder mounting flange (top plate): top flat pad with an 81.5mm bore for the cylinder sleeve, featuring 4x M10 bolt bosses arranged in an 88x88mm square grid symmetry. 4. Direct intake manifold: rectangular inlet box housing for a reed valve with cut dimensions 48mm height, 33.5mm width, and 35mm seating depth. Includes 4x M6 mounting bosses arranged in a 84x62mm bolt pattern. No organic, sculptured, or artistic shapes. Strict mechanical design for manufacturing.
Parameters
| Name | Value | Range |
|---|---|---|
| Crankcase Chamber ID | 106 mm | 50 – 200 |
| Chamber Depth | 24.05 mm | 10 – 60 |
| Crankcase Wall Thickness | 12 mm | 5 – 30 |
| Crankcase Body Length | 35 mm | 20 – 80 |
| Bearing Bore Diameter | 72 mm | 30 – 100 |
| Bearing Bore Depth | 19 mm | 5 – 40 |
| Oil Seal Counterbore Diameter | 40 mm | 20 – 80 |
| Oil Seal Counterbore Depth | 7 mm | 2 – 20 |
| Shaft Through-Hole Diameter | 32 mm | 10 – 60 |
| Main Hub OD | 96 mm | 50 – 150 |
| Hub Protrusion | 28 mm | 10 – 80 |
| Cylinder Sleeve Bore | 81.5 mm | 40 – 120 |
| Flange X Size | 140 mm | 80 – 250 |
| Flange Z Size | 140 mm | 80 – 250 |
| Flange Thickness | 15 mm | 5 – 30 |
| M10 Boss Square Spacing | 88 mm | 50 – 180 |
| M10 Boss Diameter | 16 mm | 10 – 40 |
| M10 Hole Diameter | 10.5 mm | 6 – 20 |
| M10 Boss Height | 15 mm | 5 – 40 |
| Intake Box Protrusion | 16 mm | 5 – 100 |
| Reed Valve Port Height | 48 mm | 20 – 100 |
| Reed Valve Port Width | 33.5 mm | 15 – 80 |
| Reed Valve Seating Depth | 35 mm | 10 – 80 |
| Intake Flange Y Size | 100 mm | 50 – 200 |
| Intake Flange Z Size | 80 mm | 40 – 160 |
| M6 Boss Spacing X/Y | 84 mm | 40 – 150 |
| M6 Boss Spacing Z | 62 mm | 30 – 120 |
| M6 Boss Diameter | 13 mm | 8 – 30 |
| M6 Hole Diameter | 6.6 mm | 4 – 12 |
| M6 Boss Height | 12 mm | 4 – 30 |
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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