High-performance ACL race-spec main bearing set in standard dimensions, engineered for compatibility with Nissan SR18DE, SR18DI, SR20DE, SR20DI, SR20DET, and SR20VE engines.

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	Upper & lower
Material	F780
Min. Std Shaft Size	54,956 mm / 2.1636 in
Max. Std Shaft Size	54,98 mm / 2.1646 in
Min. Std Tunnel Size	58,944 mm / 2.3206 in
Max. Std Tunnel Size	58,968 mm / 2.3216 in
Max Wall at Crown	1,975 mm / 0.0778 in
Max Overall Length	19,1 mm / 0.7520 in
Notes
Diagrams	2964H-L (1,2,3,4,5)2964H-U (1,2,3,4,5)

Vehicle Compatibility:

– Nissan SR18DE
– Nissan SR18Di
– Nissan SR20DE
– Nissan SR20DET (Except GTi-R)
– Nissan SR20Di
– Nissan SR20VE

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