Mechanical parts
Motorcycle Cylinder Block 12100-KFM-900
- Bounding box
- 90.0 × 85.0 × 94.0 mm
- Engine
- Precision B-rep
- Parameters
- 5
- Published
- November 4, 2026
Download
Free to download and use. See the terms.
The prompt
Act as a precise mechanical 3D CAD generator. Create a parametric 3D model of a motorcycle engine cylinder block (OEM 12100-KFM-900) by strictly following these step-by-step geometric Boolean operations in millimeters (mm): Base Body: Create a main rectangular block that is roughly 90.0 mm wide (X-axis) and 85.0 mm deep (Y-axis), extruded to an exact Z-axis height of 72.5 mm. Central Bore: Cut a central cylindrical hole with a diameter of exactly 50.0 mm completely through the Z-axis of the base body. Bottom Spigot: From the bottom face of the base body, extrude a cylinder downwards by exactly 21.5 mm. This bottom cylinder must have an inner diameter of 50.0 mm (matching the bore) and an outer diameter of 56.0 mm. Total Z-height is now 94.0 mm. Bolt Pattern: Cut four vertical clearance holes, each 7.0 mm in diameter, completely through the 72.5 mm base body. Position them in a rectangular pattern measuring 48.0 mm by 50.0 mm, perfectly centered around the main bore. Timing Chain Cavity: On the extreme left side of the base body, cut a large vertical slot (obround shape) measuring approximately 25.0 mm wide and 55.0 mm long, completely through the Z-axis, to create the hollow cavity for the timing chain. Cooling Fins: Apply a horizontal rib pattern to the outer exterior of the base body. Create 6 horizontal cooling fins across the Z-axis. The empty grooves between each fin must be exactly 2.5 mm wide. Apply fillets to the roots of the fins.
Parameters
| Name | Value | Range |
|---|---|---|
| Bore Diameter | 50 mm | 40 – 60 |
| Deck Height | 72.5 mm | 50 – 100 |
| Spigot Protrusion | 21.5 mm | 10 – 30 |
| Cooling Fin Count | 6 count | 3 – 10 |
| Fin Thickness | 2 mm | 1 – 5 |
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.
More models
Browse the full gallery →Plastic Bottle with Screw Cap
A plastic bottle with a twist-on screw cap. Adjustable bottle diameter, height, and cap height.
Copper Cold-Plate Base with Fin Channels and Face-Seal Groove
1. Copper Base Create a rectangular copper base 84 × 84 mm. Use C110 ETP copper. Finished overall base thickness is 5.70 mm. The bottom floor thickness below the channels is 2.50 m
Spring Cup
"Create a cylindrical spring cup. The main body has an outer diameter of 14 mm and a total height of 5 mm. Cut a centered recessed pocket into the top face that is 8.5 mm in diamet
M6 Thumb Screw
Create ONLY a mechanical thumb screw. This is NOT a knob. Create a real M6 thumb screw used in industrial machinery. Features: • Circular head 22 mm diameter • Head height 12 m
Engine Piston
make me a cylinder/piston for an engine. The bottom hole to connect to the cranckshaft needs to be 24 mm in diameter
Nuclear Medicine Center Functional Floor Plan (Parametric Wall Model)
Create a **2D architectural floor plan in DWG format** for a new **Nuclear Medicine Center**. This is a **generic conceptual functional layout**, NOT a construction-ready project.