Automotive Castings
From cylinder head covers and engine blocks to exhaust manifolds and EV motor housings — cast and machined under one roof in Ningbo, China.
Years Die Casting Experience
160T–2500T
Die Casting Machines
±0.1 mm
OEM-Grade Tolerances
12 hrs
RFQ Response Time
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From DFM to mould — all under one roof
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DFM review before tooling starts
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Thin walls, internal channels, tight ribs
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Full QC & traceability
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Global Export
Europe · N. America · SE Asia
Gravity / Die Cast · A356, ADC12
Sand / Gravity Cast · A356, GG25
Die Cast / Gravity Cast · Aluminum
Aluminum Die Cast
Gravity / Sand Cast · Aluminum, Iron
Sand Cast · Ductile Iron GGG40
Aluminum Die Cast · ADC12
Investment / Sand Cast · Alloy Steel
Aluminum Die Cast
Investment Cast · SS304 / Alloy Steel
Aluminum Die / Gravity Cast
Sand Cast · Ductile Iron
Gravity Cast · A356-T6
Aluminum Die Cast · ADC12
Aluminum Die Cast · A380
Cylinder Head Cover
The cylinder head cover (valve cover) seals the top of the engine cylinder head, protecting the valve train from contamination while retaining engine oil. Cast from lightweight aluminum alloys for reduced weight without sacrificing structural rigidity.
Renyi produces cylinder head covers via gravity casting (A356) and aluminum die casting (ADC12 / A380). Both processes achieve the flatness tolerances required for oil-tight gasket sealing. Every cover undergoes a CNC-machined sealing surface and optional air or water leak test before shipment.
Lightweight Aluminum
CNC Gasket Surface Finish
T6 Heat Treatment Available
Leak-Tested Before Shipment
Complex Internal Geometry
Tight Flatness Tolerance
Lightweight Aluminum
| Specification | Details |
|---|---|
| Typical Alloy | A356, ADC12, A380 |
| Process | Gravity Casting / Aluminum Die Casting |
| Minimum Wall Thickness | 2.5 mm (gravity) / 1.5 mm (die cast) |
| Dimensional Tolerance | ±0.1 – ±0.3 mm (CNC machined surfaces) |
| Surface Finish | As-cast / CNC milled / Powder coat / Anodize |
| Pressure Test | Air or water leak test available |
The cylinder block (engine block) is the core structural component of an internal combustion engine — housing the cylinders, coolant passages, oil galleries, and crankshaft bearing seats. Renyi produces both aluminum and gray iron blocks using gravity casting and sand casting processes for prototyping through mid-volume production.
Engine blocks demand exceptional stiffness to withstand cylinder pressures exceeding 100 bar. Our sand and gravity cast blocks meet automotive structural requirements with FEA-validated wall sections.
Critical bore locations, bearing housings, and deck surfaces are held to tight positional tolerances — supported by in-house CNC machining for cylinder bore and crankshaft tunnel finishes.
Available in aluminum alloys (A356, A319) for weight-sensitive applications, or gray iron (GG25) for durability-critical diesel and commercial vehicle engines.
Aluminum or Gray Iron — project dependent
Suitable for prototyping to mid-volume runs
Deck surface, bores, bearing tunnels, thread tapping
Exhaust manifolds collect combustion gases from every cylinder and channel them into the exhaust system — running continuously at 700–900 °C under thermal cycling and vibration. Intake manifolds distribute incoming air evenly across all cylinders for consistent combustion efficiency. Both parts live or die on gas-tight integrity and complex internal passage geometry.
Renyi produces exhaust manifolds in ductile iron (GGG40) or high-silicon aluminum for sustained high-temperature service. Intake manifolds are aluminum die cast for lightweight, corrosion-resistant construction with smooth, flow-optimised internal surfaces. All manifolds receive pressure or helium leak testing before shipment.
High Heat Tolerance (up to 900 °C)
Ductile Iron or Aluminum
Pressure & Leak Tested
CNC Flange Finish Available
Smooth Flow Surfaces
Complex Internal Channels
High Heat Tolerance (up to 900 °C)
| Specification | Exhaust Manifold |
|---|---|
| Typical Material | Ductile Iron (GGG40) / High-Si Aluminum |
| Operating Temperature | 700 – 900 °C continuous service |
| Process | Sand Casting / Shell Mold Casting |
| Pressure Test | Helium or air-pressure leak test standard |
| Flange Tolerance | ±0.15 mm (CNC machined) |
| Surface Finish | As-cast / Shot-blasted / Ceramic coated |
Exhaust & Intake Manifold
01
In-house engineers review drawings for cast-ability and optimal parting line
02
Metal moulds or sand patterns machined and verified against 3D data
03
Molten metal poured or injected under controlled temperature and pressure
04
Gates and risers removed; shot blasting for clean, uniform surface
05
Critical mating surfaces, bores, threads and flanges machined to drawing
06
CMM, leak test, visual and dimensional checks — full PPAP available
– Cylinder head covers
– Cylinder blocks
– Oil pans & sumps
– Timing chain covers
– Engine brackets & mounts
– Gearbox housings
– Differential carriers
– Clutch housings
– Transfer case bodies
– Torque converter covers
– Exhaust manifolds
– Intake manifolds
– Turbocharger housings
– EGR valve bodies
– Catalytic converter flanges
– Battery pack enclosures
– Motor housings
– Inverter brackets
– Cooling plate castings
– Charging port housings
It depends on part geometry, volume, and material. Die casting suits high-volume aluminum parts with thin walls (head covers, intake manifolds). Gravity casting works well for medium-complexity parts with thicker sections. Sand casting is preferred for iron parts or low-volume prototypes of complex geometry like cylinder blocks and exhaust manifolds. Our team provides a free process recommendation with every RFQ.
Yes. Renyi offers a complete cast-to-finish service: casting, CNC machining of critical surfaces and bores, pressure/leak testing, shot blasting, and coating. We can supply parts in whatever stage suits your assembly process — raw castings, semi-machined, or fully finished.
Yes. As an IATF 16949 certified facility we can deliver PPAP Level 1–3 packages: dimensional reports (CMM / FAI), material certifications (OES spectrographic analysis), process flow diagrams, control plans, and FMEA. CPK data is available upon request. Please specify your required PPAP level in your RFQ.
Send your drawings (2D/3D), material grade, surface finish requirements, and target quantity. Our engineering team will review manufacturability and return a full quotation within 12–48 hours.
Send your 2D/3D drawings and we’ll return a DFM review, process recommendation, and detailed quotation within 12 hours — casting, machining, and leak testing all under one roof in Ningbo, China.