The lower half of the plenum, carrying the runner interfaces.
Bonded to the plenum main body to close the volume. Made on its own 3D printed mold.
No part-specific design process is documented. The Manifolds subsystem design process applies: 1. Build the engine model in GT Suite from measured geometry: silicone-cast and 3D-scanned intake ports, dial-indicator-measured cam lobe profiles, MTS-measured valve spring curves. 2. Use GEM3D to convert manifold CAD into GT Suite flow geometry, which cut manifold setup from several hours to about 30 minutes and let subassemblies be swapped for fast comparison. 3. Sweep plenum volume, runner length and primary length in the model against volumetric efficiency. 4. Confirm on the flow bench. CR26I plenum flowed 2.34% more than CR25 and 11.15% more than CR22 on average across 10-50 in-H2O, with testing extended to 70 in-H2O (17.4 kPa) to reach WOT conditions. 5. Prototype-test the muffler on the previous car before finalising, sweeping length (14 in and 16 in), packing density, tailpipe diameter (2 in and 1.5 in) and a diffuser-style tip against the sound limits.
CFRP.
None recorded. This part has no entry in Knowledge_Transfer/Issue Logging/Fault Vault.xlsx, in either Issue Log.xlsx, in CR22/Issue Tracking/Shakedown 7-15-23.xlsx, or in any design review issue list found in CrimsonStorage or Box.
Dimensions called out on the cost report drawings. These are the figures printed on the drawing, not a labelled specification; open the drawing itself for what each one refers to. Plenum Tray (as drawn): 1.14, 0.76 1.06, 20.20, R5.59, R5.40, R2.86, R2.94 CR26 Runner Tray rev1 (as drawn): 320.90, 32.09, 10.85, 1.08, 58.53, 5.85, 133.86, 13.39, 43.47, 4.35 Source: Cost report drawings: CR22/Powertrain/Design/X - Cost Report Drawings/Manifolds/Intake/Plenum Tray.pdf; CR26i/Powertrain - IC/Design/Y - Cost Report Drawings/Manifolds/Intake/CR26 Runner Tray rev1.pdf; CR27i/.Powertrain/Design/Y - Cost Report Drawings/Manifolds/Intake/Archive/CR26i/CR26 Runner Tray rev1.pdf Quantity per car, as costed: 1
Nothing in CrimsonStorage covers these yet.