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Technical Features:
* Shot Peening for improved fatigue life
* Magnaflux Inspection guarantees the consistency of the forged material meets our high quality standard
* Multi Stage Heat Treat for maximum strength, dimensional stability, and fatigue life.
* CNC machining for superior tolerances as tight as 0.0003"
* Optimal balancing for weight matched sets (+/- 1g)
* Max. center to center length is 180mm
| Specifications | |
| Part name |
Connecting rod |
| Certification | ISO 9001:2015; SGS |
| Process | Forging, Cnc Machining, Cnc Milling, Drilling,Turning etc |
| Material | Forged Steel |
| Material | High Tensile Forged 4340 Steel |
| Surface Treatment | 0.3-0.5mm Shot Peening |
| Balanced Weight | Optimal +/- 1g per Set |
| B.E and S.E Tolerance | ≤+/-0.00017" |
| Verticality, Parallelism and Distortion | ≤+/-0.00018" |
| Center to Center Distance Tolerance | ≤+/-0.001" |
| HRC | 33-38 |
| Horse Power | 200hp per Cylinder |
| Torque of Bolt | 3/8"-75N.M; 7/16"-95N.M |
| Rate of NL GROUP Bolt | 226,000psi |
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Place of Origin
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China
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Shandong
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Brand Name
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OEM
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Car Model
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car parts
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Material
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Steel
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Service
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OEM ODM
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Surface treatment
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Customers' Demand
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Tolerance
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Drawing Request
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Equipment
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4station Cold Forging
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Standard
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Non Standard Parts
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Certification
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ISO
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| Mininum of Quantity | 100 Piece/Pieces |
| Unit Weight | 0.5kg~5kg |
| Price | FOB Qingdao,China |
| Packing Details | Paper Box in Wooden Pallet |
| Delivery Time | One month |
| Payment Terms | L/C, T/T |
| Machining | CNC or |
| Supply Capacity | 50 Metric Tons per Month |
| Standard | DIN,ASTM,GOST,B |
Q1: What is a connecting rod?
A connecting rod is a precision engine component that links the piston to the crankshaft, converting the piston's reciprocating motion into the crankshaft's rotational motion.
Q2: What are the main parts of a connecting rod?
Big End: Larger circular end that attaches to the crankshaft journal
Small End: Smaller end that connects to the piston pin (wrist pin)
Rod Shaft/Beam: The central structural member
Bearing Surfaces: Precision surfaces for crank and piston pin bearings
Bolt Holes: For connecting rod cap assembly
Q3: What materials are connecting rods made from?
Forged Steel: Most common in production engines (high strength, durability)
Cast Iron: Older or lower-performance engines
Aluminum: Racing applications (lighter but less durable)
Titanium: High-performance racing (excellent strength-to-weight ratio)
Powdered Metal: Modern manufacturing technique for complex shapes
Q4: What are the different types of connecting rods?
I-beam Rods: Standard design, good strength-to-weight ratio
H-beam Rods: Wider design for high RPM/high horsepower applications
Billet Rods: Machined from solid material (custom applications)
Cracked Cap Rods: Fracture-split design for perfect cap alignment
Q5: Why are connecting rods balanced?
Proper balancing prevents:
Engine vibration
Premature bearing wear
Reduced engine life
Potential catastrophic failure
All rods in an engine must be weight-matched within tight tolerances.
Q6: What causes connecting rod failure?
Fatigue: Repeated stress cycles
Over-revving: Exceeding RPM limits
Detonation/Knock: Abnormal combustion pressures
Oil Starvation: Insufficient lubrication
Improper Installation: Wrong torque specs or alignment
Material Defects: Manufacturing flaws
Q7: What are the signs of connecting rod problems?
Loud knocking noise from engine (especially under load)
Low oil pressure
Metal particles in oil
Engine vibration
Loss of power
Visible damage or bending upon inspection
Q8: How do I measure connecting rod wear?
Critical measurements include:
Big End Bore Diameter: Check for ovality and taper
Small End Bore Diameter: Wear assessment
Center-to-Center Distance: Rod length consistency
Bearing Clearance: Using plastigage or micrometers
Straightness and Twist Alignment: Using specialized fixtures
Q9: What maintenance do connecting rods require?
Regular oil changes with proper viscosity oil
Inspection during engine rebuilds
Bearing replacement at rebuild intervals
Checking bolt torque specifications
Visual inspection for cracks or bending
Q10: How are connecting rods manufactured?
Forging/Casting: Initial shape formation
Machining: Precision milling of all surfaces
Heat Treatment: Enhancing material properties
Balancing: Weight matching to specifications
Surface Finishing: Polishing or shot peening
Quality Inspection: Dimensional verification and crack testing
Q11: What are ARP bolts and why are they important?
ARP (Automotive Racing Products) bolts are high-strength fasteners that:
Provide more consistent clamping force
Resist stretching under load
Reduce the risk of rod cap separation
Are essential in high-performance applications
Q12: Can connecting rods be reused or should they always be replaced?
Reuse if:
Within manufacturer's specifications
No visible damage or wear
Proper cleaning and inspection
Original equipment in stock applications
Replace when:
Building a performance engine
Visible damage or wear
Uncertain history
Upgrading engine components
High-mileage engines
Q13: What are "stroker" connecting rods?
Special rods designed for stroker engine kits that:
Have different lengths than stock rods
Accommodate increased stroke crankshafts
Maintain proper piston placement and compression height
Require matching piston and crank components
Q14: How does rod length affect engine performance?
Longer Rods: Reduce piston side loading, potentially higher RPM capability
Shorter Rods: Increase piston speed, change combustion characteristics
Rod/Stroke Ratio: Affects piston motion, torque curve, and engine balance
Q15: What are torque-to-yield bolts?
One-time-use bolts that:
Are stretched to yield point during installation
Provide extremely consistent clamping force
Must ALWAYS be replaced during reassembly
Are common in modern engines
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