Description
ACL Race Series performance engine bearings are manufactured to exacting tolerances. Micron tolerance machining supported by precision measurement systems delivers consistent accuracy to key characteristics like wall thickness and crush. This ensures a reliable fit and helps maintain consistent clearances.
- High-strength overlay plate with reduced thickness for improved fatigue properties
- Hardened steel backs on all rod bearings to improve the support of the bearing lining and assist with bearing retention in the housing.
- Increased crush for improved bearing retention
- Elimination of flash plating on the back of the bearings to improve heat transfer through the bearings and to maximize the grip between the bearings and their housing.
- Increased eccentricity to compensate for bore distortion at high rpm and to assist in the formation of hydrodynamic oil films.
- 3/4 grooved Main Bearings to optimize bearing load carrying surface area and oil flow to the conrod bearings.
- Tight, consistent wall tolerances to help you maintain consistent clearances.
- Enlarged ID chamfers on bearing edges were required to accommodate a large fillet radius on performance crankshafts.
Specifications for STD size only
| Sizes | STD, .025, .25, .50 |
| Oil Clearance | |
| Half Type | Identical halves |
| Material | F781 |
| Min. Std Shaft Size | 47,956 mm / 1.8880 in |
| Max. Std Shaft Size | 47,974 mm / 1.8887 in |
| Min. Std Tunnel Size | 51 mm / 2.0079 in |
| Max. Std Tunnel Size | 51,013 mm / 2.0084 in |
| Max Wall at Crown | 1,503 mm / 0.0592 in |
| Max Overall Length | 17,1 mm / 0.6732 in |
| Notes | |
| Diagrams | 2960H |
Engine Compatibility:
– Nissan SR18DE
– Nissan SR18Di
– Nissan SR20DE
– Nissan SR20DET (Except GTi-R)
– Nissan SR20Di
– Nissan SR20VE
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