Crimson Racing Wiki

Oil Filter

Subteam: PowertrainSubsystem: LubricationAssembly: LubricationCars: CR21, CR22, CR25, CR26I

Purpose

Remove particulates from the oil before it returns to the engine.

Function

On the CR26I arrangement, a custom cap acts as the oil filter within the sandwich plate assembly.

Design Process

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.

Reoccuring issues

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.

Properties

CAD mass, CR26I master assembly: 0.452 lb (0.205 kg). CG at X 76.14 in, Y -4.41 in, Z 6.04 in in vehicle coordinates. CAD mass, CR25 master assembly: 0.452 lb (0.205 kg). CG at X 76.14 in, Y -4.41 in, Z 6.04 in in vehicle coordinates. CAD mass, CR22 master assembly: 0.452 lb (0.205 kg). CG at X 76.14 in, Y -4.41 in, Z 6.04 in in vehicle coordinates. Source: SolidWorks mass model exports: CR22 (5 May 2024), CR25 (4 Jul 2025), CR26I (30 Jul 2025), CR26E (22 Mar 2026) Quantity per car, as costed: 1

Still to document

Nothing in CrimsonStorage covers these yet.