Brackets and mounts
2-Stroke Engine Crankcase (Left Half)
- Bounding box
- 169.0 × 164.0 × 144.0 mm
- Engine
- Precision B-rep
- Parameters
- 34
- Published
- September 19, 2026
Download
Free to download and use. See the terms.
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 |
|---|---|---|
| Body Width (X) | 140 mm | 100 – 200 |
| Body Depth (Y) | 120 mm | 80 – 180 |
| Body Height (Z) | 130 mm | 100 – 200 |
| Chamber Diameter | 106 mm | 80 – 150 |
| Chamber Depth | 24.05 mm | 10 – 40 |
| Chamber Center Z | 65 mm | 40 – 100 |
| Hub Outer Diameter | 90 mm | 70 – 120 |
| Hub Length | 30 mm | 20 – 50 |
| Hub Center Z | 65 mm | 40 – 100 |
| Bearing Bore Diameter | 72 mm | 50 – 100 |
| Bearing Bore Depth | 19 mm | 10 – 30 |
| Seal Counterbore Diameter | 40 mm | 25 – 60 |
| Seal Counterbore Depth | 7 mm | 3 – 15 |
| Shaft Through Hole Diameter | 32 mm | 20 – 50 |
| Top Flange Width (X) | 110 mm | 80 – 160 |
| Top Flange Depth (Y) | 110 mm | 80 – 160 |
| Top Flange Thickness | 10 mm | 5 – 20 |
| Cylinder Sleeve Bore Diameter | 81.5 mm | 60 – 100 |
| Top Bolt Pattern X | 88 mm | 60 – 120 |
| Top Bolt Pattern Y | 88 mm | 60 – 120 |
| Top Bolt Hole Diameter | 10.5 mm | 6 – 16 |
| Top Boss Diameter | 18 mm | 12 – 30 |
| Top Boss Height | 5 mm | 2 – 15 |
| Intake Box Width (X) | 100 mm | 70 – 140 |
| Intake Box Depth (Y) | 40 mm | 25 – 70 |
| Intake Box Height (Z) | 70 mm | 50 – 100 |
| Intake Cut Width | 33.5 mm | 20 – 60 |
| Intake Cut Depth | 35 mm | 20 – 60 |
| Intake Cut Height | 48 mm | 30 – 80 |
| Intake Bolt Pattern X | 84 mm | 60 – 120 |
| Intake Bolt Pattern Z | 62 mm | 40 – 90 |
| Intake Bolt Hole Diameter | 6.5 mm | 4 – 12 |
| Intake Boss Diameter | 12 mm | 8 – 20 |
| Intake Boss Height | 5 mm | 2 – 15 |
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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