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Below is copy written in the same style for “Aluminum Alloy Cast Automotive Engine Block Connecting Rods,” along with the product specifications.
Aluminum alloy-cast automotive engine blocks and connecting rods serve as the lightweight framework at the heart of the powertrain. Through precision processes such as vacuum high-pressure casting and die-casting, they maximize the lightweight and tough properties of aluminum-silicon alloys. The cylinder block integrates a thin-walled water jacket and oil return channels, while the connecting rods feature a breakaway design. This significantly reduces the overall weight of the engine while unlocking greater power-to-displacement ratio potential for the powertrain. The excellent thermal conductivity of the aluminum alloy matrix rapidly and evenly distributes heat between the combustion chamber and friction pairs, suppressing the tendency toward knocking and pre-ignition to achieve efficient thermal management. The dense and uniform microstructure resulting from precision casting ensures high pressure resistance and fatigue strength, enabling the lightweight structure to withstand powerful output and providing a solid, reliable foundation for every combustion cycle.
Product Name: Aluminum Alloy Cast Engine Block and Connecting Rods
Installation Location: Automotive Engine Powertrain / Crank-Connecting Rod Mechanism
Product usage scenarios
1. High-Performance Turbocharged Scenarios
Product Name: High-Pressure-Resistant Die-Cast Aluminum Alloy Cylinder Block and Extrusion-Cast Connecting Rod
Installation Location: 2.0T/3.0T high-output turbocharged direct-injection engines
Developed specifically for high-power-density engines, it features a vacuum die-cast aluminum alloy cylinder block and closed-die extrusion-cast connecting rods. The materials undergo microalloying treatment, resulting in a significant increase in tensile strength and fatigue limit. The cylinder block features an integrated cross-flow cooling jacket design that precisely controls the temperature of the combustion chamber’s top ring area, ensuring no warping or deformation occurs even under peak combustion pressures of up to 200 bar. The internal flow lines of the die-cast connecting rods are dense and free of porosity, and they feature high-precision serrated mating surfaces created through a expansion-breaking process. This maintains connection rigidity at high speeds of 8,000 rpm and under continuous alternating impact, enhancing engine responsiveness and durability limits.
2. High-Efficiency Scenarios for New Energy Hybrid Vehicles
Product Name: Ultra-Lightweight Aluminum Alloy Cylinder Block and Connecting Rod Assembly for Hybrid Vehicles
Installation Location: Engine Designed Specifically for Atkinson/Miller Cycle Hybrid Systems
Tailored for maximum thermal efficiency and frequent start-stop conditions, the cylinder block is made of high-strength, high-toughness, heat-treatment-free die-cast aluminum alloy, featuring an ultra-thin 2.5mm water jacket wall thickness and reducing the weight of a single engine by more than 15 kg. Lightweight short-skirt pistons, paired with fine-diameter die-cast aluminum alloy connecting rods, significantly reduce reciprocating inertia and optimize friction, enabling the engine to operate continuously within the hybrid system’s high-efficiency range. The rapid heat equalization capabilities of the aluminum alloy cylinder block and connecting rods allow the engine to reach its optimal operating temperature within an extremely short warm-up period, significantly reducing cold-start wear and fuel consumption, and helping to minimize the vehicle’s carbon emissions.
3. Commercial Applications Requiring High Durability and Long Service Life
Product Name: High-Reliability Cast Aluminum Alloy Cylinder Block and Reinforced Connecting Rods
Installation Location: Light Commercial Vehicles/Pickup Trucks; Diesel/Gasoline Engines
To meet the demands of commercial load-carrying applications, sustained high loads, and a full life cycle of one million kilometers, the cylinder block is made of a high-nickel aluminum-silicon alloy and features either plasma-sprayed cylinder bores or cast-iron liners, balancing lightweight construction with exceptional wear resistance. The connecting rods are made of high-strength Al-Cu aluminum alloy and formed through multi-directional forged extrusion, featuring continuous streamlines along the parting line. Their shear and fatigue resistance far exceed those of conventional castings. The deep bolt seats between the cylinder head and block have been thickened and stress-optimized to withstand long-term, high-frequency burst pressures without loosening or leaking, serving as a solid foundation for cost reduction, efficiency improvement, and reliable uptime in commercial vehicle powertrains.
Product Specifications
| Parameter Categories | Key Indicators |
|---|---|
| material (that sth is made of) | Cylinder block: A356/AlSi9Cu3(Fe)/AlSi10MnMg, etc.; Connecting rod: AlCu2Ni/AlSi7Mg, etc. (die-cast alloys) |
| Molding process | Cylinder block: vacuum high-pressure casting/low-pressure casting + heat treatment; connecting rods: die-casting/liquid die forging; connecting rod heads are produced using a swaging process |
| Tensile Strength (Cylinder Block) | ≥280 MPa (samples taken from the T6-conditioned body) |
| Yield Strength (Cylinder Block) | ≥210 MPa |
| Elongation (cylinder) | ≥5% |
| Connecting Rod Fatigue Strength | Symmetrical cyclic bending fatigue limit ≥220 MPa (1×10? cycles) |
| Cylinder block wall thickness | The water jacket wall thickness is 2.5 mm–3.5 mm, and the main bearing wall thickness is locally reinforced. |
| intensity | Approximately 2.68–2.75 g/cm3 |
| hot treatment (e.g. of metal) | T6/T7 solution treatment + artificial aging, or as-supplied |
| Cylinder Bore Treatment | Embedded Cast Iron Cylinder Liners / Arc-Sprayed Iron-Based Coatings / Laser Alloying |
| Main Bearing Housing | Cast Iron Insert-Type Bearing Cover / All-Aluminum Expandable Bearing Housing |
| Connecting Rod Breakage Process | C70S6 steel crack rod caps (mixed) or directly machined aluminum alloy; aluminum alloy connecting rods use a combination of serrated edges and tenon-and-mortise positioning |
| NVH Optimization | The cylinder block features integrated reinforcing ribs and a curved skirt design, reducing radiated noise by 3–5 dB. |
| Compatible Models | Three-cylinder, four-cylinder, or six-cylinder engines with displacements ranging from 1.0L to 3.5L and peak power output of 200kW or more |
| Certification Standards | Complies with ISO/TS 16949; materials are ROHS/ELV-compliant; cleanliness meets ISO 16232 |
Manufacturing & Services
Ningbo Hersin Moulding Co., Ltd. has accumulated profound experience in the field of aluminum alloy high-pressure casting and precision machining, and can provide full-process manufacturing solutions for engine front-end accessory brackets from mold development, die-casting molding, precision machining to surface treatment. The company is equipped with advanced die-casting units and high-precision machining centers, with perfect dimensional testing and material performance verification capabilities.
In response to the technical requirements of different OEMs and engine platforms, the company can provide customized co-development services covering topology optimization, material selection and verification, and large-scale mass production support. At the same time, we support a variety of functional surface treatment processes to meet the differentiated needs for corrosion and aging resistance in different service environments.
