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Engine · 993-ENG-EXHAUST-MANIFOLD-IN625-F0-0001

993 Turbo three-into-one exhaust manifold, IN625 F0 concept

ConceptNot authorised until engineering review

Independent concept of an IN625 three-into-one flow core to screen LPBF manufacturing without internal welds in the manifold. Kline and PorscheFanatics publish an IN625 offer at 2.9 kg per side with heat exchanger; the PET identifies the left and right parts. No public geometry is used.

Concept CAD rendering for 993-eng-exhaust-manifold-in625-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-exhaust-manifold-in625-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, 1995–1998
Variants
993 Turbo, M64 60 research
Porsche part numbers
Not recorded
Category
Exhaust manifold flow core
Geometry basis
Mixed
Preferred process
Not chosen yet
Other candidate processes
Laser powder-bed fusion (metal printing), Direct metal laser sintering (metal printing), sheet_metal
Material
EOS NickelAlloy IN625 / UNS N06625 for screening
Material standard
ASTM F3055, AMS 7000 or AMS 7001 and a program-specific exhaust specification to be contracted

Known limits

  • Only the 993 Turbo identity, the IN625 material and the 2.9 kg mass with heat exchanger are published.
  • The diameters, thickness, spacings, paths, length and three-into-one junction are entirely synthetic.
  • The STEP omits flanges, turbine, heating heat exchanger, brackets, gaskets and installed environment.
  • The computed core mass of 509.97 g cannot be compared as an equivalent to the 2.9 kg commercial assembly.
  • The 1D flow assumes 3.6 L, 5,750 rpm, volumetric efficiency 0.95, gas at 900 K and equal sharing between cylinders.
  • Loss, stresses, expansion, radiation and acoustics are analytical screens, not CFD/FEA/CHT results.
  • The STEP proves only a single BREP with a connected internal volume and is not authorized for manufacturing or engine use.

Post-processing it would need

  • Complete powder removal through three open inlets and one open outlet
  • Stress relief, heat treatment and possible HIP qualified on representative witness coupons
  • Build plate cut-off and support removal with no internal support
  • Machining of flanges and interfaces after adding measured machining allowances
  • Internal finishing with controlled roughness and residual wall thickness
  • Particulate cleaning, dye penetrant, CT and leak proof test before thermal testing

What a supplier would have to provide

  • Traceable powder, machine, parameters, orientation, lot and recycling
  • Demonstrated capability on a 1.2 mm hot wall and an unsupported internal manifold
  • Support, recoater and distortion simulation before build
  • Coupons in critical orientations with hot, fatigue, creep and oxidation properties
  • CT of the three-into-one junction and metrology of walls, ports, flanges and future fastenings
  • Comparison with the bent/welded manifold on cost, mass, loss, service life, repairability and inspection

Sources