The Eagle Specialty Products H-Beam Connecting Rod (CRS5394H3D-1) is a high-performance forged connecting rod engineered for Honda D16 and compatible ZC engines. Manufactured from premium SAE 4340 forged chromoly steel, this connecting rod offers the strength, durability, and precision required for demanding naturally aspirated, turbocharged, supercharged, and competition engine builds.

Designed as a direct replacement for a compatible D16/ZC connecting rod, the Eagle CRS5394H3D-1 features a 5.394-inch (137mm) center-to-center length, an H-beam construction, and premium 3/8-inch ARP 2000 connecting rod bolts.

Eagle utilizes a two-piece forging process that optimizes the grain structure of the connecting rod and cap. The rod is fully machined and shot-peened to improve surface characteristics and fatigue resistance under demanding engine loads.

Unlike conventional factory connecting rods, which may become a limiting factor as cylinder pressure and engine output increase, Eagle's forged H-beam design is engineered for performance applications requiring greater connecting rod strength.

The CRS5394H3D-1 also features a bushed small end designed for a 19mm full-floating wrist pin, making it suitable for compatible aftermarket piston assemblies.

Each rod is manufactured to precise dimensional tolerances to support proper bearing fitment, piston alignment, and rotating assembly operation.

This particular part number is sold as one individual connecting rod, making it an excellent option for engine builders replacing a damaged rod or servicing an existing Eagle H-beam rotating assembly.

For complete four-cylinder engine builds, Eagle also offers the corresponding four-piece connecting rod set under part number CRS5394H3D.

Whether rebuilding a Honda D16, upgrading a turbocharged D-Series engine, or maintaining a competition-built ZC engine, the Eagle CRS5394H3D-1 Forged H-Beam Connecting Rod provides proven construction, premium fasteners, and precision manufacturing for serious performance applications.

Features

• Genuine Eagle Specialty Products: Manufactured for high-performance Honda D16 and ZC engines.

• Forged SAE 4340 Chromoly Steel: Provides excellent strength and durability under demanding engine loads.

• H-Beam Construction: Designed to resist bending and deformation under increased cylinder pressure.

• Two-Piece Forging Process: Optimizes grain orientation in the connecting rod and cap.

• 5.394-Inch Center-to-Center Length: Factory-style rod length for compatible D16/ZC applications.

• 137mm Connecting Rod Length: Metric equivalent of the nominal connecting rod length.

• 3/8-Inch ARP 2000 Rod Bolts: Premium connecting rod fasteners designed for high-performance use.

• Fully Machined Construction: Precision machining supports consistent dimensions and bearing fitment.

• Shot-Peened Surface: Helps improve fatigue resistance by introducing beneficial compressive surface stresses.

• Full-Floating Wrist Pin Design: Bushed small end accommodates compatible floating piston pins.

• 19mm Wrist Pin Compatibility: Designed for a nominal 0.748-inch piston pin diameter.

• Precision-Machined Big End: Provides the proper housing dimensions for compatible rod bearings.

• Alignment Sleeves: Help maintain accurate connecting rod cap positioning.

• High-Strength Rod Cap: Designed to withstand demanding combustion and inertial loads.

• Competition-Oriented Design: Suitable for properly engineered high-performance engine combinations.

• Turbocharger Applications: Supports the increased cylinder pressures associated with forced induction.

• Supercharged Applications: Suitable for compatible performance supercharger builds.

• High-Compression Naturally Aspirated Builds: Supports performance-oriented D-Series engine configurations.

• Precision Manufacturing Tolerances: Designed for consistent dimensions and reliable assembly.

• Individual Replacement Rod: Ideal for replacing one rod in an existing compatible Eagle rotating assembly.

• Approximately 535-Gram Typical Weight: Manufacturer-listed reference weight.

• Honda D16/ZC Engine Compatibility: Designed for the specified Honda engine family.

• Eagle Part Number CRS5394H3D-1: Ensures accurate identification and ordering.

Additional Information

• Manufacturer: Eagle Specialty Products
• Part Number: CRS5394H3D-1
• Product Type: Performance Connecting Rod
• Product Series: ESP H-Beam
• Engine Application: Honda D16 / ZC
• Material: Forged SAE 4340 Steel
• Connecting Rod Design: H-Beam
• Manufacturing Process: Two-Piece Forging
• Surface Finish: Fully Machined and Shot-Peened
• Center-to-Center Length: 5.394 Inches / 137mm
• Wrist Pin Diameter: 0.748 Inches / Approximately 19mm
• Wrist Pin Configuration: Bushed for Full-Floating Piston Pin
• Pin End Width: 0.716 Inches
• Big End Width: 0.892 Inches
• Big End Housing Bore: 1.890 Inches
• Rod Journal Diameter: 1.771 Inches
• Rod Bolt Size: 3/8 Inch
• Rod Bolt Material: ARP 2000
• Typical Connecting Rod Weight: 535 Grams
• Recommended Rod Bolt Torque: 43 ft-lbs with ARP Moly Lubricant
• Quantity: One Individual Connecting Rod
• UPC: 793348000336

Forged 4340 Chromoly Steel Construction

The Eagle CRS5394H3D-1 is manufactured from forged SAE 4340 steel, a high-strength alloy commonly used in performance engine components.

4340 steel contains alloying elements that contribute to its strength, toughness, and fatigue resistance.

These characteristics make it suitable for connecting rods exposed to increased cylinder pressure, high engine speeds, and demanding operating conditions.

Eagle's forging process produces a strong foundation for the rod before precision machining and finishing.

H-Beam Connecting Rod Design

The H-beam design features a reinforced beam cross-section intended to provide excellent structural strength.

This construction helps the connecting rod withstand the forces generated during combustion and the rapid changes in direction experienced by the piston and rotating assembly.

H-beam connecting rods are popular in turbocharged and competition engines where factory connecting rods may not provide sufficient strength for the intended power level.

Two-Piece Forging Process

Eagle manufactures its H-beam connecting rods using a two-piece forging process.

This method allows the connecting rod and cap to be forged with grain orientation appropriate for their respective loading conditions.

The resulting components are then machined to the required dimensions.

This manufacturing approach contributes to the strength and durability of the finished connecting rod assembly.

ARP 2000 Connecting Rod Bolts

The CRS5394H3D-1 is equipped with 3/8-inch ARP 2000 rod bolts.

Connecting rod bolts are critical fasteners responsible for maintaining proper clamping force between the connecting rod and cap.

During high-RPM operation, these fasteners experience substantial tensile loads.

ARP 2000 fasteners are manufactured from high-strength alloy steel and are widely used in performance engine applications.

Manufacturer torque specification: 43 ft-lbs using ARP Moly Lubricant only.

Always follow the current instructions supplied with the connecting rod and fasteners. Professional engine builders may verify fastener stretch where applicable.

5.394-Inch Connecting Rod Length

The connecting rod features a nominal 5.394-inch (137mm) center-to-center length.

Connecting rod length is measured between the center of the crankshaft journal bore and the center of the wrist pin bore.

This dimension is critical for maintaining the intended piston position within the cylinder.

Changing rod length without selecting the appropriate piston compression height can create serious engine assembly problems.

The CRS5394H3D-1 is intended for compatible D16/ZC rotating assemblies requiring this length.

Full-Floating Wrist Pin Design

The Eagle connecting rod features a bushed small end designed for a full-floating piston pin.

Unlike a press-fit wrist pin arrangement, a full-floating design allows the wrist pin to rotate relative to the piston and connecting rod.

This configuration requires compatible pistons, wrist pins, and retaining clips.

The CRS5394H3D-1 uses a nominal 19mm wrist pin.

Important: Factory pistons designed for press-fit wrist pins may not be compatible without changing the piston and pin configuration.

Precision-Machined Big End

The connecting rod features a 1.890-inch big-end housing bore and is designed for a nominal 1.771-inch crankshaft rod journal.

The housing bore is the connecting rod bore without the bearing shells installed.

The rod journal diameter refers to the crankshaft journal on which the connecting rod bearing operates.

These measurements are different and should not be confused.

Correct bearing selection and oil clearance are essential for reliable engine operation.

Shot-Peened Surface Treatment

Eagle's H-beam connecting rods feature a shot-peened surface.

Shot peening introduces compressive stresses into the outer surface of the connecting rod.

These stresses can help improve resistance to fatigue cracking under repeated loading.

This process is particularly beneficial in components exposed to the continuous tension and compression cycles of a running engine.

Connecting Rod Weight and Engine Balance

Eagle lists a typical weight of approximately 535 grams for this connecting rod.

Actual individual rod weight may vary.

Because CRS5394H3D-1 is sold as a single replacement rod, matching its weight to the remaining connecting rods is especially important.

For engines originally assembled with a weight-matched set, the replacement rod should be checked and balanced to the existing rotating assembly.

When ordering a replacement rod, provide the required weight information if available.

Horsepower Capability

Eagle's published catalog literature has described its forged 4340 H-beam connecting rod family as suitable for competition applications up to approximately 900 horsepower.

This is a general product-family recommendation, not a guaranteed horsepower rating for every individual D16/ZC engine combination.

Actual engine reliability depends on numerous factors, including:

• Engine displacement and compression ratio.

• Turbocharger or supercharger configuration.

• Peak cylinder pressure.

• Engine RPM.

• Piston and wrist pin selection.

• Bearing clearances and lubrication.

• Engine management calibration.

• Fuel quality.

• Rotating assembly balance.

• Overall engine condition.

A properly engineered and professionally assembled engine is essential for achieving reliable performance.

Single Rod vs. Complete Connecting Rod Set

The CRS5394H3D-1 is sold as one individual connecting rod.

Eagle also offers the corresponding four-cylinder connecting rod set under part number CRS5394H3D.

The single rod is primarily intended for replacing an individual rod in a compatible engine assembly.

For a complete engine build, purchasing a matched four-piece set is generally preferable.

Engine Block and Girdle Clearance

Some Honda D16/ZC applications may require minor clearancing of the engine block or main cap girdle to accommodate the aftermarket connecting rods.

Clearance requirements depend on the exact engine configuration.

Always rotate the assembled engine by hand and verify connecting rod clearance throughout the crankshaft's full rotation before final assembly.

Common Reasons for Replacement

• Damaged Connecting Rod: Replaces a bent, cracked, or otherwise damaged connecting rod.

• Turbocharger Upgrades: Supports increased engine loads in properly engineered forced-induction applications.

• Supercharger Builds: Provides forged connecting rod construction for compatible boosted engines.

• High-Compression Engine Builds: Supports performance naturally aspirated engine configurations.

• Engine Rebuilding: Replaces an existing rod during a complete engine overhaul.

• Bearing Failure Repairs: Provides a replacement when a connecting rod has been damaged by bearing failure.

• High-RPM Performance Applications: Supports engines operating under demanding rotational loads.

• Competition Engine Maintenance: Allows replacement of an individual rod in a compatible Eagle assembly.

• Rotating Assembly Upgrades: Provides forged construction for performance-oriented engine builds.

• D-Series Turbo Projects: Suitable for compatible Honda D16 and ZC forced-induction engines.

• Preventative Performance Upgrades: Replaces factory connecting rods when greater strength is required.

• Individual Rod Replacement: Allows repair without purchasing a complete four-piece set when appropriate.

Installation Notes

1. Verify Engine Compatibility: Confirm that the engine is a compatible Honda D16 or ZC configuration.

2. Confirm Connecting Rod Dimensions: Verify center-to-center length, big-end dimensions, and wrist pin diameter.

3. Inspect the Crankshaft: Check rod journals for wear, damage, and dimensional accuracy.

4. Verify Piston Compatibility: Ensure the pistons accept the specified 19mm full-floating wrist pin.

5. Inspect the Wrist Pin: Confirm proper pin diameter, fitment, and condition.

6. Check Connecting Rod Weight: Match the replacement rod to the existing rotating assembly.

7. Inspect the Engine Block: Check for damage, cylinder wear, and potential clearance issues.

8. Check Main Cap Girdle Clearance: Some applications may require minor clearancing.

9. Select Correct Rod Bearings: Use bearings compatible with the crankshaft and connecting rod dimensions.

10. Measure Bearing Oil Clearance: Verify clearance using appropriate precision measuring tools.

11. Inspect the Rod Bolts: Confirm that the supplied ARP 2000 fasteners are clean and undamaged.

12. Use the Correct Lubricant: Apply ARP Moly Lubricant according to the manufacturer's instructions.

13. Follow Rod Bolt Torque Specifications: Eagle specifies 43 ft-lbs with ARP Moly Lubricant for this rod.

14. Verify Fastener Stretch if Applicable: Follow the current ARP and Eagle installation instructions.

15. Install the Piston and Wrist Pin: Use compatible full-floating piston hardware.

16. Install Wrist Pin Retainers: Ensure the retaining clips are fully seated in the piston grooves.

17. Verify Piston Orientation: Install the piston and rod in the correct orientation.

18. Lubricate Assembly Components: Use suitable engine assembly lubricant on the bearings and related components.

19. Install the Connecting Rod Assembly: Follow the engine manufacturer's recommended procedure.

20. Verify Rod Cap Orientation: Keep the matching rod cap correctly positioned.

21. Check Side Clearance: Confirm proper connecting rod side clearance on the crankshaft.

22. Inspect Rotating Assembly Clearance: Rotate the crankshaft through multiple revolutions.

23. Verify Piston-to-Valve Clearance: Check clearance when using aftermarket pistons, camshafts, or cylinder head modifications.

24. Confirm Rotating Assembly Balance: Balance the assembly as required before final engine operation.

25. Prime the Lubrication System: Establish proper oil pressure before initial startup.

26. Follow Proper Engine Break-In Procedures: Use the recommended startup and break-in process for the complete engine build.

27. Monitor Initial Engine Operation: Check oil pressure, operating temperature, and abnormal engine noises.

28. Professional Installation Recommended: Connecting rod installation requires precision measurements and specialized engine assembly knowledge.

Important: Improper connecting rod installation, incorrect bearing clearances, or improper rod bolt tightening can cause catastrophic engine damage. Professional engine assembly is strongly recommended.

What's Included

• (1) Eagle Specialty Products Forged 4340 Steel H-Beam Connecting Rod – Honda D16/ZC (CRS5394H3D-1)

• ARP 2000 Connecting Rod Fasteners for the Supplied Rod

Note: This product is sold as one individual connecting rod, not a complete four-cylinder set. Pistons, wrist pins, wrist pin retaining clips, connecting rod bearings, and additional connecting rods are sold separately.

Build a stronger, more dependable Honda D-Series engine with the Eagle Specialty Products Forged 4340 Steel H-Beam Connecting Rod (CRS5394H3D-1).

Featuring forged 4340 chromoly steel construction, a 5.394-inch center-to-center length, precision-machined H-beam design, shot-peened finish, 19mm full-floating wrist pin compatibility, and premium 3/8-inch ARP 2000 rod bolts, this connecting rod delivers the strength and precision demanded by serious performance engine builds.

Whether repairing a Honda D16 engine, replacing an individual rod in an existing Eagle rotating assembly, or maintaining a turbocharged ZC competition engine, the Eagle CRS5394H3D-1 provides proven performance engineering and reliable construction for demanding applications.