Blocks off the OEM exhaust gas recirculation port, which the car does not use.
Removing the EGR path simplifies the intake tract and removes a leak path.
No part-specific design process is documented. The Engine subsystem design process applies: 1. Characterise the engine experimentally rather than from published data. Intake port geometry captured by pouring 2-part casting silicone into the ports, then 3D scanning and post-processing the molds. Port flow measured on a flow bench with valve lift controlled by fine-pitch fasteners threaded into a plate bolted to the head, read on dial indicators, with an individually characterised bell mouth adapted to the port inlet. 2. Measure camshaft geometry with a dial indicator rigidly mounted to the head probing the lobe surface, combined with lifter geometry to get the effective lift profile. CR26I: exhaust 180 deg ECD at 0.050 in lift, 7.95 mm max lift at 245 deg ATDC; intake 200 deg ECD, 8.67 mm max lift at 475 deg ATDC; 115 deg LSA, 150 deg overlap. 3. Measure valve spring force-displacement on an MTS Exceed, averaging multiple springs. Maximum displacement limited by coil bind at 0.9270 in. 4. Build the GT Suite model from those measurements and validate against dyno data. 5. Develop calibration on the engine test stand, then validate on track.
Aluminium plate. From the cost report drawings and CAD: From the cost report drawings: Aluminum (EGR Blockoff Plate).
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. EGR Blockoff Plate (as drawn): 0.50 5.20, R0.70, R0.30, R1.00, 7.50 Source: Cost report drawings: CR25/Powertrain/Design/Y - Cost Report Drawings/Engine/EGR Blockoff Plate.PDF; CR26i/Powertrain - IC/Design/Y - Cost Report Drawings/Engine/EGR Blockoff Plate.PDF; CR27i/.Powertrain/Design/Y - Cost Report Drawings/Engine/EGR Blockoff Plate.PDF Quantity per car, as costed: 2
Nothing in CrimsonStorage covers these yet.