100cc_Cylinder_Block

Please create a fully parametric 3D CAD model of a 100cc motorcycle engine cylinder block (OEM Part Number: 12100-KFM-900). Prior to modeling, ensure the system unit is strictly set to millimeters (mm). Proceed with the following exact specifications: Core Geometry: The cylinder bore diameter is 50.00 mm. The main aluminum cylinder body must have a face-to-face deck height of 72.50 mm. Spigot Dimension: The cast iron sleeve (spigot) must protrude past the bottom mating surface to achieve a total overall height of 94.00 mm. Apply an interference fit tolerance (0.04 - 0.06 mm) between the outer diameter of the cast iron sleeve and the aluminum block. Bolt Pattern: Create four clearance holes for the mounting stud bolts with a diagonal center-to-center spacing of 69.50 mm. Include standard counterbores for 8x14 mm alignment dowel pins on the mating flanges. Timing Chain Cavity: Cut an obround/slot cavity on the left side of the cylinder for the timing chain clearance. Apply a 1.5 to 2-degree draft angle to all vertical inner walls for manufacturability (die-casting). Include a threaded M8 boss on the outer wall for the cam chain guide roller pin. Cooling Fins: Extrude a linear array of 5 to 7 horizontal cooling fins. The groove width between the fins must be 2.50 mm. Taper the fins towards the edges and apply generous fillets at the root to prevent stress concentration."

Parameters

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.