Diesel TDC Combustion Chamber Volume

Generate a single, watertight, solid 3D CAD part representing the closed combustion-chamber volume of a single-cylinder diesel engine at top dead centre (TDC), suitable for CFD simulation in SolidWorks Flow Simulation. Units: millimetres. Origin at the centre of the top face. The Z axis points upward. Build the part from these primitive operations only: 1. MAIN CYLINDER - Create a cylinder of diameter 87.5 mm (radius 43.75 mm). - Top face at Z = 0 (this represents the flat cylinder head). - Bottom face at Z = -3.5 mm (this represents the piston crown at TDC). - Height = 3.5 mm. 2. PISTON BOWL (centred cut in the bottom face) - On the bottom face (Z = -3.5 mm), cut a centred cylindrical recess. - Bowl diameter = 45 mm (radius 22.5 mm). - Bowl depth = 12 mm, so the bowl's flat bottom is at Z = -15.5 mm. - Bowl walls are vertical and its bottom is flat. 3. OPTIONAL INJECTOR SEAT (only if it does not break the solid) - On the top face (Z = 0), add a centred cylindrical protrusion of diameter 10 mm and height 2 mm, with a flat top. If this causes any non-manifold geometry, omit it. RULES - The final part must be ONE closed solid body. - All faces must be planar or cylindrical. No fillets, no chamfers, no threads, no blends. - Do not add intake ports, exhaust ports, valves, valve seats, pistons, or connecting rods. - Do not shell the part. Do not create surface bodies. - The part must be exportable as STEP (.step) or SolidWorks part (.sldprt). - Verify the solid is watertight (zero free edges) before finishing.

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.