Bohua supports truck, diesel, passenger-vehicle, and light-commercial intake manifold RFQs where runner geometry, flange flatness, port machining, sensor bosses, A356-T6 selection, and supplier comparison matter before tooling.
Technical reviewer: Junchi Li
RFQ evidence paths
Supplier evaluation
An intake manifold combines internal runner geometry, machined sealing faces, bolt and port location, core positioning, and launch validation. Ask every candidate to explain how its proposed manufacturing route controls those risks before tooling approval.
Ask why the proposed gravity, low-pressure, or other casting route fits the geometry, alloy, wall sections, annual volume, heat treatment, and validation scope. A process label without drawing-based reasoning is not enough.
Ask which runner, core, flange, bolt-hole, and port features are controlled in casting; which are finished by CNC; how machining stock and datums are defined; and how flange condition is checked after machining.
If A356-T6 or an equivalent is proposed, require the governing material requirement, heat-treatment route, property or record expectations, and any distortion risk that affects fixtures or machining—not a generic ‘similar material’ statement.
Make tooling ownership, first-sample scope, inspection output, correction responsibility, revision loops, CNC-fixture timing, and production-release approval visible before purchase order approval.
Same evidence for every candidate
Send the same controlled RFQ package to each supplier and record its answer in the same matrix. Treat unanswered fields as open risks; do not fill them with buyer assumptions.
| Shortlist area | Evidence to compare | Decision signal |
|---|---|---|
| Process and alloy | Written route and alloy rationale tied to geometry, volume, heat treatment, and function | Supplier explains trade-offs and identifies missing inputs |
| Runner, core, and flange control | Core-position strategy, machining stock, flange and port control, datum plan | Casting and CNC responsibilities are unambiguous |
| Tooling and sample workflow | Tool ownership, design review, first-sample output, correction path, fixture timing | Approval gates and change ownership are stated before award |
| Inspection and validation | Named CMM features, material or heat-treatment records, flange/port checks, FAI or PPAP scope | Records match the drawing and buyer acceptance plan |
| Commercial completeness | Casting, machining, finishing, packing, Incoterm, exclusions, and schedule dependencies | Quotes are comparable as delivered-part scopes |
| Repeat-production support | Revision control, lot traceability, change notification, corrective-action and ongoing inspection plan | Supplier describes control after first samples, not samples alone |
Shortlist gate
The shortlisted supplier should explain how the manifold will be cast and machined, which evidence accompanies samples, what remains open, and how repeat production will stay revision-controlled. A fast quotation alone does not pass this gate.
Intake manifold RFQ path
These product and guide pages help buyers define the drawing, tooling, alloy, machining, inspection, and supplier-comparison inputs needed before quotation.
Use this product page for diesel engine intake manifold RFQs involving A356-T6, gravity casting, runners, flanges, ports, and machining.
View RFQ pathUse this page for passenger or light-commercial intake manifold RFQs involving runner consistency, flange flatness, and drawing-based sourcing.
View RFQ pathUse this checklist to define flange flatness, port location, sensor bosses, datum strategy, machining fixture scope, and CMM records before supplier comparison.
Read machining checklistUse the cross-project supplier checklist alongside the intake-specific shortlist matrix on this page.
Open supplier checklistUse this quote route when buyers need one supplier conversation for A356-T6, runner geometry, flange machining, port accuracy, sensor bosses, tooling, inspection, and launch timing.
Prepare intake quote pathSend drawings, 3D model, runner and port requirements, flange flatness, sensor boss details, alloy target, heat-treatment expectations, machining scope, annual volume, and inspection requirements.
A356-T6 can be a strong discussion point when buyers need heat-treatable strength, stable gravity-cast sections, machining stock, and corrosion resistance, but the final alloy should be confirmed against the drawing and specification.
Ask about runner fill, flange machining, datum control, tooling ownership, sample approval, inspection records, export packaging, and how the supplier handles repeat production consistency.
Use it before price comparison when the drawing has tight flange flatness, port location, sensor boss, mounting datum, machining fixture, or CMM reporting requirements.
Give each supplier the same drawing package and compare its process rationale, runner and flange control plan, machining-datum strategy, tooling and sample workflow, named inspection outputs, exclusions, and repeat-production plan. Advance suppliers that connect engineering risks to a clear commercial scope rather than relying on a low casting-only price.
