Steel Steel Connecting Connecting

RodsRods

BackgroundBackground Factory connecting rods are mass producedFactory connecting rods are mass produced Cast from regular automotive grade IronCast from regular automotive grade Iron Reasons:Reasons:

FasterFaster Easier Easier CheaperCheaper

Background ContinuedBackground Continued I-Beam design reinforces wrong faceI-Beam design reinforces wrong face 4 stroke engine revolution places:4 stroke engine revolution places:

Moment loadMoment load Compression loadCompression load Tension loadTension load

When Regular Rods Go When Regular Rods Go BadBad

Factory Factory Rods are Rods are usually usually the weak the weak linklink

New Design, New New Design, New MaterialMaterial

New H-Beam New H-Beam design places design places reinforcement on reinforcement on the proper facethe proper face

AISI 4340 Steel is AISI 4340 Steel is the most commonthe most common

Other Materials Other Materials also used:also used: TitaniumTitanium 7075 T-6 Aluminum7075 T-6 Aluminum Nodular IronNodular Iron Pearlite IronPearlite Iron 5140 Steel5140 Steel

H-Beam DesignH-Beam Design

Designed on AutoCAD for low weight, Designed on AutoCAD for low weight, high strengthhigh strength

800 HP and 7,500 Rpm Rating (for 800 HP and 7,500 Rpm Rating (for Pontiac)Pontiac)

Rods and Caps are forged separatelyRods and Caps are forged separately Optimizes grain flowOptimizes grain flow Enhances structural IntegrityEnhances structural Integrity

Higher Quality control than factoryHigher Quality control than factory

Specifications of AISI 4340 Specifications of AISI 4340 SteelSteel

Density: 7.85 g/cmDensity: 7.85 g/cm3

Tensile Strength (Ultimate): 1220 MPaTensile Strength (Ultimate): 1220 MPa Tensile Strength (Yield): 786 MPaTensile Strength (Yield): 786 MPa Percent Elongation at Break: 13.5%Percent Elongation at Break: 13.5% Percent Reduction of Area: 37.3%Percent Reduction of Area: 37.3% Modulus of Elasticity: 205 GPaModulus of Elasticity: 205 GPa Poisson’s Ratio: 0.29Poisson’s Ratio: 0.29 Machinability: 50%Machinability: 50% Shear Modulus: 80 GPaShear Modulus: 80 GPa

All Specifications are for AISI 4340 Steel, normalized, 50 mm roundAll Specifications are for AISI 4340 Steel, normalized, 50 mm round

Any Questions?Any Questions?