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4340 Steel Connecting Rods

Learn about the benefits of using AISI 4340 Steel Connecting Rods in engines for improved strength, performance, and durability. Find out why this material is superior to others and how it optimizes grain flow and structural integrity.

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4340 Steel Connecting Rods

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  1. 4340 Steel Connecting Rods Javier A. Lozano Material Science MEEN 3344

  2. Factory connecting rods are mass produced Cast from regular automotive grade Iron Reasons: Faster Easier Cheaper Background

  3. Background Continued • I-Beam design reinforces wrong face • 4 stroke engine revolution places: • Moment load • Compression load • Tension load

  4. When Regular Rods Go Bad • Factory Rods are usually the weak link

  5. New Design, New Material • AISI 4340 Steel is the most common • Other Materials also used: • Titanium • 7075 T-6 Aluminum • Nodular Iron • Pearlite Iron • 5140 Steel • New H-Beam design places reinforcement on the proper face

  6. H-Beam Design • Designed on AutoCAD for low weight, high strength • 800 HP and 7,500 Rpm Rating (for Pontiac) • Rods and Caps are forged separately • Optimizes grain flow • Enhances structural Integrity • Higher Quality control than factory

  7. Specifications of AISI 4340 Steel • Density: 7.85 g/cm3 • Tensile Strength (Ultimate): 1220 MPa • Tensile Strength (Yield): 786 MPa • Percent Elongation at Break: 13.5% • Percent Reduction of Area: 37.3% • Modulus of Elasticity: 205 GPa • Poisson’s Ratio: 0.29 • Machinability: 50% • Shear Modulus: 80 GPa All Specifications are for AISI 4340 Steel, normalized, 50 mm round

  8. References Callister, William D. Fundamentals of Material Science and Engineering: an integrated approach. Hoboken: John Wiley & Sons, Inc, 2005. C.A.T. (2005). AISI 4340 "H" BEAM SUPER RACING ROD - 3D+. C.A.T. Power Engine Parts. Retrieved February 22, 2006. from http://www.catpep.com/catproducts/connectingrod/4340HBeamsuperracingrod.asp Eagle S P. (2006). "ESP" H-beam connecting rods. Eagle Specialty Products, Inc. Retrieved February 28, 2006. from http://www.eaglerod.com/ ASM Material Data Sheet. (2003). AISI 4340 Steel, normalized, 50 mm (2 in.) round. ASM Aerospace Specification Metals, Inc. Retrieved February 24, 2006. from http://asm.matweb.com/search/SpecificMaterial.asp?bassnum=M434AD Summit Racing Equipment. (2006). ESP-6625PP3D. AUTOSALES, Inc. http://store.summitracing.com/default.asp?target=/egnsearch.asp&N=400075 Wikipedia. (2006). Connecting Rod – Wikipedia, the free Encyclopedia. Wikimedia Foundation, Inc. Retrieved January 1, 2006. http://en.wikipedia.org/wiki/Connecting_rod

  9. Any Questions?

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