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Engine · 993-ENG-INTAKE-VALVE-TI64-HOLLOW-F0-0001

993 hollow Ti64 intake valve, F0 LPBF concept

ConceptNot authorised until engineering review

Independent concept of a hollow Ti-6Al-4V intake valve with four internal ribs and an open axial bore for depowdering. Only the head diameter, stem diameter, product envelope, declared mass and part number are published; all functional geometry remains an F0 hypothesis.

Concept CAD rendering for 993-eng-intake-valve-ti64-hollow-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-intake-valve-ti64-hollow-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, 1994–1998
Variants
993 C2, 993 C4, 993 Turbo, M64 research
Porsche part numbers
99310540902
Category
Intake valve hollow
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, screening; material of the 993 part number and of the Swindon kit not published
Material standard
ASTM F2924 and a program-specific valve specification to be contracted

Known limits

  • The 49 mm, 8 mm, 50 x 110 x 50 mm, 120 g and the part number come from a commercial product page with no drawing or independent measurement.
  • The 109 mm length, the head, neck, cavity, 5 mm bore and four 1.2 mm ribs are entirely synthetic.
  • The 55.45 g CAD mass and the 23.38% saving compare two F0 designs sharing the same invented exterior; they do not validate a saving over OEM.
  • The 12 mm lift, 240 crank degrees, 520 N + 40 N/mm spring, 0.20 MPa and +400 K are unmeasured regression cases.
  • The first mode at 190.8 Hz is a cantilever beam screen, not a modal analysis of the guide-seat-spring-cam system.
  • The section, Euler and circular plate stresses ignore contacts, impact, valve float, groove, defects and multiaxial fatigue.
  • The EOS/TIMET values are ambient and physical comparisons, not hot LPBF valve allowables.
  • The STEP proves only a readable BREP with an open cavity; it is authorized neither for manufacturing, nor for installation, nor for an engine.

Post-processing it would need

  • Vertical-axis orientation and support strategy to be qualified
  • Documented depowdering of the cavity through the open axial bore
  • Stress relief and heat treatment qualified for the machine and parameters
  • HIP to be decided on the defect population and representative fatigue
  • Closure of the end by a process to be defined, then CT and proof test
  • Machining and finishing of the stem, seat, groove, head and datums
  • Coating, tip hardness, guide-seat matching and clearance balancing

What a supplier would have to provide

  • Traceable powder, machine, parameters, orientation, lot and recycling
  • Oriented coupons with tensile, HCF/LCF, impact, creep, oxidation, wear and alpha case at temperature
  • Proof of depowdering of the 5 mm bore over about 100 mm and an internal cleanliness criterion
  • Qualification of the end closure, its sealing and its retention
  • Full CT, metallography, penetrant testing and metrology after all post-processing
  • Full-scale valve tests on a hot rig, a motored cylinder head, then an engine before the vehicle

Titanium route

Alloy
Ti-6Al-4V Grade 5 candidate only; no grade is established for Porsche part number 99310540902
Heat treatment
EOS stress-relief and ductility treatment to be qualified; no recipe frozen without machine, orientation, coupons and closure
Hot isostatic pressing
To be determined
  • CT of the head, ribs, bore, closure and transitions
  • Metrology of length, diameter, straightness, runout, seat and groove
  • Roughness, porosity, alpha case, residual stresses and internal cleanliness
  • Penetrant testing after machining and inspection of the closure
  • Hot impact, bounce, wear, fatigue and retention tests

Sources