Completed a standalone, parametric exact-solid aluminum velocity stack, one barrel only. Best validated CAD candidate; NOT released for machining or installation. The model uses publicly documented nominal flush-flange geometry; compatibility with the user's actual Weber 45 DCOE variant remains unverified. No PCB, electronics, carburetor model, inserted sleeve, or mounting hardware assembly was added.

The model card download menu supplies the editable build123d source and pipeline-derived exact STEP/BREP or tessellated STL/GLB. STEP is not a mesh conversion.

Stored pre-CAD concept sketch

Concept caption: proposed mechanical form, not a dimensional drawing; schematic arrows and perspective are illustrative. It shows the requested open trumpet, two ears, rounded lip and aluminum intent. No board is present or mocked up.

Actual CAD render

Rendered from the pipeline GLB, not generated from the reference image. Geometry, scale and transforms were preserved.

All dimensions mm unless stated. Public nominal values are not toleranced inspection data for the user's carburetor.

The reproduced mating drawing labels a small fixing-hole dimension inconsistent with the current sourced M6 stud; its hole diameter was not used. The model uses Webcon's M6 nominal thread and a separate design clearance. The EFI PDF's searchable technical content was retrieved, but a direct full PDF download stalled and was incomplete; no detailed visual tolerance interpretation is claimed. Reproduced drawings show the 65 mm stud line centered about the bore. For reference, rotation of local +X to 115 degrees gives left-barrel hole coordinates approximately (-13.735,+29.455) and (+13.735,-29.455); the opposite barrel uses 65 degrees. These advisory angles do not lock the standalone model's installation orientation.

For 0.2 <= z <=12, r=22.5. For 12 <= z <=39.091665098:

This meridian is an exact degree-2 Bezier, revolved 360 degrees, not a polyline or conical approximation. Its controls in (r,z) are (22.5,12), (22.5,25.545832549), (31.324211435,39.091665098). The derivative is zero at the cylindrical throat, giving a tangent-continuous join.

The entry circle is centered at (r,z)=(33,38), radius2. The inlet touches it at (31.324211435,39.091665098), slope dr/dz=0.651433672. The circle reaches z=40 and r=35, then joins the outer cubic at (34.675788565,36.908334902). The outer cubic is a smooth fairing, not part of the claimed parabolic flow surface. The straight throat, parabola and lip are G1 tangent-continuous, not G2 curvature-continuous; the lip is intentionally circular rather than parabolic. The inner bottom edge has a 0.2 mm handling break.

Warning — axial socket access is blocked by the 70 mm lip. At65 mm stud pitch each stud lies at radius32.5, beneath the bell. A Ø14 mm cylindrical tool envelope from nut level through the top intersects approximately737 mm³ of trumpet. Do not plan straight axial socket tightening or drilling from the lip side.

The modeled flange allows nominal M6 stud, Ø12 washer and10 AF nut envelopes without interference: washer at z5..6.6; nut at z6.6..11.8; exposed stud through z15. Calculated washer-to-root radial margin at the flange is0.5 mm. Outward lateral14 mm-wide x5.5 mm-high tool corridors at nut height have zero overlap with the standalone stack, so a slim lateral open-ended wrench is plausible. Actual wrench-head shape, rotation sweep, neighboring carburetor/airbox access and assembly sequence remain unverified. Install the flange over studs, feed hardware laterally under the lip, and verify a real wrench before committing machining. Stock 23 mm stud overall length is not its installed protrusion; gasket and shoulder stack-up must be measured. Nominal washer+nut+flange stack is11.8 mm, excluding any gasket.

Hardware is assessed only by test envelopes: no screws, nuts, washers or sleeve are part of the delivered single-solid model. Do not use the clearance analysis as a torque or vibration-locking specification.

CNC plan: profile the bore and outer bell on a lathe/mill-turn; finish the underside datum, flange perimeter and drill/chamfer the two holes from the underside on a supported fixture. Target two workholding setups on suitable mill-turn equipment; separate lathe/mill equipment may require additional setups. Machining access under the lip, chuck/fixture contact and tools require shop CAM approval. A profiled/sacrificial support or soft-jaw/mandrel strategy is needed: unsupported height35 / minimum wall2.5 =14, above the10x chatter guideline. Preserve the parabolic bore during polishing; do not sand to an unspecified curve. No flow, structural, vibration, fatigue or engine performance testing was performed.

The open bore is not an enclosed cavity. Flange outline has tangent transitions; R1 neck root and0.2 flange/bore/hole edge breaks are explicitly modeled. No internal square pocket corners or tapped holes are present. Final dimensional tolerances, surface roughness, material certification, coating allowance, flatness and inspection gauges are NOT SPECIFIED pending shop/user agreement. A cosmetic print is not suitable evidence for engine-service material compatibility.

Completed: research with differentiated flush/inserted interfaces; concept stored before CAD;40/70 parametric quadratic inlet; integral nominal two-hole flange; exact-solid pipeline upload and download card; standalone aluminum root model; source/STEP validation; nominal pair and hardware-envelope checks; actual render and turntable; descriptive project name and this design record.

Failed/blocked: unconditional direct bolt-on/installation qualification (items1–7 above); browser focus acknowledgement (frontend timeout). Neither blocks downloading/editing the candidate CAD.

Unattempted / not claimed: manufacturing, physical trial fit, actual carburetor/passages collision model, optional retention sleeve geometry, full installed hardware assembly, shop CAM/toolpath, CFD or engine-power optimization, strength/fatigue qualification, and ordering. Completion of this CAD batch is separate from manufacture-ready approval.