Precision Custom Engine Valve Springs
High-performance valve springs for OEM and racing engines. Manufactured under an IATF 16949-certified quality management system, with tight dimensional tolerances and high fatigue strength to help prevent valve float at high RPM.
- Wire diameter 1.3–6 mm
- IATF 16949 & ISO 9001 certified
- 10,000+ m² production facility, 300+ machines
- Fatigue life validated via in-house spin testing
标准样品3-5天内交付 · 批量生产15-25天内交付 · 最低起订量500件 · 提供工程支持
What Is a Valve Spring?
A valve spring is a critical elastic component in an engine's valvetrain system. It ensures that each valve closes promptly and maintains a reliable seal against the valve seat during every cycle. Valve springs operate under high-frequency reciprocating motion, alternating loads, and elevated temperatures, so they must retain stable spring force and fatigue life over extended service. Most are made from high-quality spring steel and go through coiling, heat treatment, end grinding, and surface treatment to control wire diameter, coil count, free length, spring rate, and end squareness. Spring selection should consider valve lift, RPM range, installation space, and operating temperature. Consistent wire diameter, correct model identification, and traceable material information are key to confirming valve spring fit and reliability.
Valve Spring Types
Single Valve Springs
Single-spring design for stock and mild performance engines. Provides simple, cost-effective valve control and reliable sealing for standard applications.
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Dual Valve Springs
Nested inner and outer springs designed for increased seat pressure and frictional damping. Ideal for high-lift and high-RPM racing applications.
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Beehive Springs
Tapered coil design that reduces upper valvetrain mass and helps prevent spring surge. Suited for lightweight, high-RPM performance.
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Conical Springs
Conical coil profile that raises the natural frequency of the spring, helping control valvetrain harmonics for stable high-RPM operation.
Request a QuoteCustomizable Parameters
Key specifications can be tailored to your application. Contact our engineering team to confirm the achievable range for your project.
The values above are typical reference values. Final specifications are confirmed against the customer drawing and datasheet.
Engineering Support for Your Spring Design
Whether you have a sample, a drawing or only a set of operating conditions, our engineers review the design with you before production begins.
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[ 01 ]
Sample Reverse Engineering
Send us a sample without a drawing. Our engineers measure it and rebuild the design, including wire diameter, outer diameter, free length and coil count.
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[ 02 ]
CAD Drawing for Approval
Based on your sample or specification, we prepare CAD drawings and send them to you for confirmation before any production starts.
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[ 03 ]
Design Support
To start the design, we need your installation space, target engine speed, valve lift, installed height, and seat and open pressure requirements.
Materials & Finishes
Valve Spring Wire
Oil-tempered chromium-silicon and chromium-silicon-vanadium wire designed for high-cycle fatigue loads in valve springs, with good relaxation resistance at working temperatures up to about 250 °C.
High-Strength Spring Steel
High-strength spring steels with good fatigue resistance for heavy-duty spring applications.
Stainless & High-Temperature Alloys
Corrosion-resistant stainless for springs in humid and chemical environments, and Inconel X-750 for high-temperature springs with long-term service at 700–800 °C.
Surface Treatment
Shot peening and stress control improve fatigue life. Oil coating and VCI packaging protect against corrosion during storage and transport.
Quality Control
Each batch is checked against the customer drawing and datasheet before shipment, from raw material to finished part.
Incoming Quality Control (IQC)
Raw materials are checked for chemical composition and properties before they enter production.
In-Process Quality Control (IPQC)
Dimensions and performance are monitored during coiling, heat treatment and finishing.
Outgoing Quality Control (OQC)
Finished springs are re-inspected against the drawing before shipment, with data kept on record.
Test Items
- Load at installed height (seat pressure)Measured on the compression tester
- Load at maximum lift (open pressure)Measured on the compression tester
- Spring rateCalculated from load at two heights on the compression tester
- Wire diameter, outer diameter and free lengthMeasured on the 2.5D / 2D video measuring instrument and optical projector
- End squareness and coil gapChecked on the optical projector
- Chemical compositionAnalyzed on the optical spectrometer
- Microstructure and decarburizationExamined on the metallographic analysis system
- Fatigue lifeTested on the compression–tension–torsion life testing equipment
Your Customization Journey
From your first inquiry to delivery, we follow a clear process so that every step is confirmed before production begins.
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01
Inquiry & Spec
Define material, dimensions, and MOQ targets.
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02
Design & Tooling
Mould design, CAD approval, and initial mould production.
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03
Sample Trial
Physical sample production and customer performance testing.
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04
Mass Production
High-volume manufacturing under strict ISO control.
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05
Logistics
Secure packaging and container loading.
Lead Time & MOQ
Clear sample lead times and flexible project coordination help OEM buyers plan custom engine valve spring development and production.
| Item | Lead Time / MOQ | Details |
|---|---|---|
| Standard Sample Lead Time | 3–5 Days | Standard samples delivered within 3–5 days. |
| Mass Production Lead Time | 15–25 Days | Confirmed according to order quantity, spring specifications, and production schedule. |
| Minimum Order Quantity (MOQ) | 500 Pieces | Minimum order quantity for production orders: 500 pieces. |
| Trade Terms | EXW, FOB, CIF, DDP | Shipping terms and delivery arrangements are confirmed during quotation. |
Planning a custom valve spring project? Share your drawings, target quantity, and delivery requirements to receive a project-specific quotation and lead-time confirmation.
Packaging Solutions
Protected against corrosion and damage in transit, with batch traceability on every shipment.
Rust Protection
Valve springs are oil-coated or protected with VCI anti-rust packaging, selected according to storage time, transport conditions, and customer requirements.
Transport Packaging
Inner PE bags, cartons, or color boxes on pallets or in wooden crates. Pallets are wrapped in film to seal out moisture and sea air during shipment.
Batch Traceability
Each batch is tracked from wire heat lot through production traveler card, inspection records, and shipping label, so every delivery can be traced back to its source records.
Custom Packaging on Request
Packaging can be adapted to customer requirements, including carton labeling, quantity per box, inner separation method, pallet or crate type, and oil-free VCI packaging where required.
Certification
Frequently Asked Questions About Valve Springs
01 How Do Wire Diameter and Free Length Affect Valve Spring Fit and Performance?
Wire diameter, free length, coil count, and installed height directly affect valve spring load, stiffness, and coil-bind clearance. Even small differences in wire diameter or free length can change seat load and open load, which may influence valve float risk, fatigue life, and valvetrain stability at high RPM. For accurate evaluation, provide a drawing or the key specifications, including wire diameter, free length, installed height, load at installed height, material, and application details.
02 What Materials Are Used for High-Temperature Valve Springs?
Valve spring material is selected according to operating temperature, stress level, fatigue requirements, and the engine application. Common options include high-quality spring steels such as chrome-silicon and other oil-tempered spring wire grades, with surface treatment or shot peening where required. Because material choice affects fatigue resistance and load retention at high temperature, the final specification should be confirmed against the valve spring drawing, working conditions, and expected service life.
03 How Can I Tell If a Valve Spring Needs Replacement?
A valve spring should not be judged by appearance alone. Useful checks include free length, installed height load, perpendicularity, surface wear, corrosion, cracks, and signs of fatigue. Engine symptoms such as valve float, misfire, reduced power, or unstable high-RPM operation may also indicate a spring issue, but these symptoms can have other causes. Replacement intervals and inspection criteria should follow the OEM specification or the agreed maintenance plan for the engine.
04 How Do I Match the Mould Number or Part Number to My Engine Application?
The OEM part number, engine model, and valve spring drawing are the most reliable references for matching a valve spring to an engine application. A mould number or tooling number may identify the manufacturing tool used for a spring, but it does not always confirm the final engine application by itself. To avoid mismatches, cross-check the part number with dimensions, wire diameter, free length, installed height, load specifications, and material requirements before approval.
05 Can You Produce Custom Valve Springs from a Sample or Drawing?
Yes. A technical drawing is the preferred starting point for custom valve spring production. If a drawing is not available, a physical sample can help our engineering team evaluate the spring and determine whether reverse engineering is feasible. Useful information includes wire diameter, free length, coil count, installed height load, material, surface treatment, and estimated order quantity. Confidential drawings and specifications can be reviewed under an NDA before sensitive files are shared.
Looking for a Custom Spring Solution?
Let's Discuss Your Requirements.
Share your drawings, specifications, or sample requirements with our team. We'll help you evaluate the right spring solution for your application.
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