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Engine · 993-ENG-CONNECTING-ROD-TI64-F0-0001

993/993 Turbo connecting rod, Ti64 F0 topology concept

ConceptNot authorised until engineering review

Independent two-open-flange concept to screen an LPBF Ti-6Al-4V connecting rod. The key dimensions come from a PAUTER/TZR record; outer diameters, flanges, cap split and bolt passages remain F0 assumptions with no commercial surface reused.

Concept CAD rendering for 993-eng-connecting-rod-ti64-f0-0001.
Not a photograph, not a render of a manufactured part, not evidence of fit or function.
Concept CAD orthographic views for 993-eng-connecting-rod-ti64-f0-0001.
Front, side and top views of the same concept CAD. Dimensions describe the model; fit on the car remains unverified.

The design

Vehicle
Porsche 993, 1993–1998
Variants
993, 993 Turbo, M64 60 research
Porsche part numbers
Not recorded
Category
Connecting rod
Geometry basis
Mixed
Preferred process
Laser powder-bed fusion (metal printing)
Other candidate processes
Direct metal laser sintering (metal printing), CNC machining
Material
Ti-6Al-4V Grade 5 LPBF for screening; PAUTER titanium alloy unknown
Material standard
ASTM F2924 and program-specific connecting rod specification to be contracted

Known limits

  • Only the center distance, the two functional diameters, the two widths, the steel mass and the advertised titanium gain come from the PAUTER/TZR record.
  • The 78/40 mm outer diameters, the two 10 x 14 mm flanges, the cap and the bolt passages are F0 assumptions.
  • The CAD mass of 341.02 g depends on a synthetic shape and a nominal density; it validates neither the PAUTER gain nor the balancing.
  • The load case uses a cylinder pressure of 12 MPa, 600 g piston/pin, one third of the rod mass and 100 h, all entirely synthetic.
  • LPBF is the preferred process only to study the F0 topology; the production choice remains conditional on comparison with forged/machined steel and conventional titanium.
  • Section stresses, the Kt=1.5 factor and Euler replace neither 3D contact, nor bolt preload, nor bearing shells, nor multiaxial fatigue.
  • The EOS/TIMET values are ambient and physical comparisons, not hot or fatigue LPBF allowables.
  • The full-scale Cecchel study reports fatigue below the conventional reference and requires dedicated qualification.
  • The STEP proves only two re-readable BREP solids; it is authorized neither for manufacturing, nor for installation, nor for an engine.

Post-processing it would need

  • Powder removal through a fully open topology
  • Stress relief and heat treatment qualified for machine, parameters and orientation
  • HIP to be decided on defect population and representative fatigue tests
  • Separation and machining of the cap, joint face, bolt bores and seats
  • Machining and finishing of both bores with defined small-end bushing and bearing shells
  • Radiusing, polishing of load paths, end-to-end and set balancing

What a supplier would have to provide

  • Traceable powder, machine, parameters, orientation, lot and powder recycling
  • Oriented coupons with tensile, toughness, fatigue and representative defects after all post-processing
  • Full dimensional analysis of the joint face, center distance, bores, squareness and parallelism
  • CT of the body and cap, dye penetrant inspection after machining and roughness check
  • Capability evidence on preload, friction, tightening and service life of the selected bolts
  • Proof tests then full-scale fatigue with an approved engine envelope before any dyno run

Titanium route

Alloy
Ti-6Al-4V Grade 5 candidate only; the alloy of the PAUTER option is not published
Heat treatment
EOS stress relief and ductility treatment to be qualified; no recipe is frozen without supplier, orientation and coupons
Hot isostatic pressing
To be determined
  • CT of the body, cap, fillets and flange transitions
  • Full metrology of bores, center distance, joint face, parallelism and squareness
  • Dye penetrant inspection after machining and finishing
  • Roughness, porosity, alpha case, residual stresses and balancing
  • Proof tests and full-scale fatigue with representative bolts, bearing shells and pins

Sources