---
title: "Cylinder block"
industry: "Motor Vehicle Manufacturing"
verification_protocol:
  urn: "URN:CNFX:ME:CYLINDER_BLOCK"
  data_integrity_hash: "5820dcf0d122a7fdf963b46645e25018"
  source_authority: "https://cnfx.com"
  strict_mode: true
source_identity:
  provider: "CNFX Industrial Knowledge Graph"
  index_version: "2026.Q1-Universal"
  authority_id: "URN:CNFX:ME:CYLINDER_BLOCK"
  data_source_uri: "https://cnfx.com/llms/industry/motor-vehicle-manufacturing/product/cylinder-block.md"
  official_resource_url: "https://cnfx.com/industry/motor-vehicle-manufacturing/product/cylinder-block"
  is_verified_logic: true
attributes:
  spec:
    status: "config-dependent"
    typical_range: "0-200 bar internal pressure, -40°C to 150°C temperature"
    unit: "mm"
engineering_limits:
  max_safe_operating_point:
    value: 250
    unit: "MPa"
    consequence: "Thermal fatigue from cyclic heating (combustion at 2000°C) and cooling (coolant at 90°C) causing crack initiation at stress concentrations, cavitation erosion from coolant pressure drops below 0.7 bar vapor pressure"
fmea_matrix_quantitative:
  - node_1:
      trigger: "Insufficient cooling flow rate below 15 L/min per cylinder"
      severity: 8
      occurrence: 3
      detection: 4
      mitigation_protocol: "Integrated cooling jacket with computational fluid dynamics-optimized flow channels maintaining 2.5 m/s coolant velocity"
  - node_2:
      trigger: "Cylinder bore honing surface roughness exceeding Ra 0.8 μm"
      severity: 8
      occurrence: 3
      detection: 4
      mitigation_protocol: "Plateau honing process with 45° cross-hatch pattern maintaining Ra 0.4-0.6 μm with 15-25% bearing area"
bom_nodes:
  cylinder-bore:
    type: "component"
    urn: "URN:CNFX:ME:CYLINDER_BORE"
    interface_type: "physical-logic-coupled"
  coolant-passages:
    type: "component"
    urn: "URN:CNFX:ME:COOLANT_PASSAGES"
    interface_type: "physical-logic-coupled"
  main-bearing-caps:
    type: "component"
    urn: "URN:CNFX:ME:MAIN_BEARING_CAPS"
    interface_type: "physical-logic-coupled"
manufacturing_compliance:
  - standard: "ISO 286-1:2010 (GEOMETRICAL PRODUCT SPECIFICATIONS - LIMITS AND FITS)"
    scope: "Verified Engineering Specification"
  - standard: "DIN EN 1563:2018 (FOUNDING - SPHEROIDAL GRAPHITE CAST IRONS)"
    scope: "Verified Engineering Specification"
url: "https://cnfx.com/llms/industry/motor-vehicle-manufacturing/product/cylinder-block.md"
on_chain_sovereignty:
  contract_standard: "ERC-721-Industrial"
  metadata_hash: "9cb2eddafc58266c47c2c6296ab9cd0e2e027820d1dbe66c4f407cb80d0fc63a"
  royalty_logic: "IPFS-CID-REQUIRED"
  mint_status: "logic-verified-ready"
version: "3.3.4-EXTREME-SOVEREIGN-WEB3"
---

# Industrial Specification: Cylinder block

## 1. Technical Definition
The main structural component of an internal combustion engine that houses the cylinders and provides mounting points for other engine components.

## 2. Engineering Reasoning & Causal Matrix
> **Operational Intelligence**: Designed for **0-200 bar internal pressure, -40°C to 150°C temperature**. Failure boundary: **Material yield strength exceeded at 250 MPa stress, thermal expansion differential exceeding 0.15 mm/mm strain**, Mechanism: **Thermal fatigue from cyclic heating (combustion at 2000°C) and cooling (coolant at 90°C) causing crack initiation at stress concentrations, cavitation erosion from coolant pressure drops below 0.7 bar vapor pressure**.

### 2.1 Analytical Physics Model
Governed by the **Thin-Wall Pressure Vessel Stress Analysis**:

> **Primary Equation**: $\sigma_h = \frac{P \cdot D}{2t}$  
> **Engineering Impact**: Determines the hoop stress boundary to prevent rupture.

| Symbol | Variable Definition | Localized Reference |
| :--- | :--- | :--- |
| P | Internal Pressure | Engineering Constant |
| D | Diameter | Engineering Constant |
| t | Wall Thickness | Engineering Constant |

### 2.2 FMEA (Failure Mode & Effects Analysis)
| Event Trigger | Severity | Failure Mode | Mitigation Strategy |
| :--- | :--- | :--- | :--- |
| Insufficient cooling flow rate below 15 L/min per cylinder | 8 | Localized overheating exceeding 180°C causing material annealing and distortion | Integrated cooling jacket with computational fluid dynamics-optimized flow channels maintaining 2.5 m/s coolant velocity |
| Cylinder bore honing surface roughness exceeding Ra 0.8 μm | 8 | Accelerated piston ring wear generating 0.1 mm clearance within 50,000 cycles | Plateau honing process with 45° cross-hatch pattern maintaining Ra 0.4-0.6 μm with 15-25% bearing area |

## 3. Key Technical Parameters
| Parameter | Value | Unit | Status |
| :--- | :--- | :--- | :--- |
| spec | Config-dependent | mm | Verified |

## 4. System BOM & Knowledge Routing
### Core Components (Recursive Links)

### Industrial DNA Context (De-duplicated)
**Complementary Dependencies**: **CNC Machining Center**, **Cylinder Bore Honing Machine**, **Coordinate Measuring Machine**  
**Downstream Applications**: Internal Combustion Engine, Automotive Powertrain Assembly, Industrial Generator Set  

## 5. Engineering Risks & FAQ
- **Caution**: 
- **Caution**: 
- **Caution**: 

### Q: What are the advantages of aluminum alloy cylinder blocks over cast iron?
**A**: Aluminum alloy cylinder blocks are lighter, improving fuel efficiency and vehicle performance, while cast iron offers superior durability and heat resistance for heavy-duty applications.

### Q: How do coolant passages in cylinder blocks prevent engine overheating?
**A**: Coolant passages circulate coolant fluid around the cylinders to absorb and dissipate heat, maintaining optimal engine temperature and preventing damage from overheating.

### Q: What maintenance is required for cylinder block main bearing caps?
**A**: Main bearing caps require periodic inspection for wear, proper torque during installation, and lubrication to ensure crankshaft alignment and prevent engine failure.

## 6. Manufacturing Compliance
- ISO 286-1:2010 (GEOMETRICAL PRODUCT SPECIFICATIONS - LIMITS AND FITS)
- DIN EN 1563:2018 (FOUNDING - SPHEROIDAL GRAPHITE CAST IRONS)

---
### 🛠️ Engineering Resource Access
🔗 **[Full Specification: Cylinder block](https://cnfx.com/industry/motor-vehicle-manufacturing/product/cylinder-block)**

### 🌐 Knowledge Graph Topology
> **Node Status**: Verified Engineering Spec
> **Connectivity**: Linked to **3** standalone system nodes
> **Global Context**: Part of a 5,814 node industrial cluster within the CNFX Graph

> **Reference ID**: CYLINDER_BLOCK | **Authority**: CNFX-2026-ST-001 | **Fingerprint**: 759b53e2
