Pull air through the oil cooler core when the vehicle is not moving fast enough to do it.
A 5.2 inch Spal VA31-A101-46A fan in a 3D printed PA6-GF shroud. Activated automatically at 90 C oil temperature.
No part-specific design process is documented. The Lubrication subsystem design process applies: 1. Set capacity and pan geometry from the packaging envelope and the CG target. CR26I: 1.95 qt pan, 3 qt system, low-profile design lowering engine CG by 1.6 cm on the earlier revision. 2. Design the baffle and trap door layout, keeping baffle clearances tight and stiffening the mounting flange to improve gasket reliability. 3. Size the oil cooler from measured heat rejection. 4. Select the oil to meet Yamaha's specification (API SP, JASO MA2) with wet-clutch-safe additives. 5. Validate on the sloshing test tracks, logging oil pressure against lateral and longitudinal acceleration. Test 1 minimum oil pressure 30.7 psi at 7,200 rpm with 1.41 g sustained for 1 s and a 2.21 g peak; test 2 minimum 31.3 psi at 6,000 rpm with a 2.02 g peak. 6. Send an oil sample for analysis after 500+ miles of track and dyno running.
Purchased.
Purchased unit.
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.
Approximately 244 CFM according to the fan curve and radiator data. Weight 0.902 lb. Maximum current draw 4.7 A normal use, 5.2 A on start. Combined with the water fan this gives a 0.628 lb net weight loss against CR22's package. Quantity per car, as costed: 1
Nothing in CrimsonStorage covers these yet.