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4340 Steel Connecting Rods

4340 Steel Connecting Rods. Javier A. Lozano Material Science MEEN 3344. Factory connecting rods are mass produced Cast from regular automotive grade Iron. Reasons: Faster Easier Cheaper. Background. Background Continued. I-Beam design reinforces wrong face

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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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