Product Overview
ACL Race Series Main Bearings for Nissan SR20DE & SR20DET
The ACL Main Bearing Shell Nissan SR20DE DET STD – 5M2964H is a high-performance main bearing set developed for builders who demand reliable crankshaft support from Nissan’s legendary SR20 engine.
Suitable for Nissan SR20DE and SR20DET 2.0-litre engines, the ACL Race Series bearing construction is designed to withstand the increased loads and engine speeds commonly found in tuned, turbocharged, motorsport and high-performance applications.
Whether you are carrying out a complete SR20DET engine rebuild, refreshing a naturally aspirated SR20DE, or building a modified SR20 for fast-road, drift, track or competition use, ACL Race Series bearings are a popular upgrade over conventional replacement bearings.
High-Performance Tri-Metal Construction
ACL Race Series engine bearings use a high-performance F780 tri-metal bearing material engineered to provide excellent strength under demanding operating conditions.
The bearing design incorporates a high-strength overlay with reduced thickness to improve fatigue resistance, helping the shells cope with the loads generated by increased RPM, boost pressure and performance engine modifications.
Designed for the Nissan SR20 Engine
The ACL 5M2964H main bearing set is specifically listed for:
- Nissan SR20DE
- Nissan SR20DET
- 2.0L inline-four engines
- Standard crankshaft journal size
- Non-GTi-R SR20 applications
Important: This bearing set is not suitable for Nissan Pulsar/Sunny GTi-R SR20DET engines. GTi-R engines require a different ACL main bearing specification.
Ideal for Performance Engine Builds
ACL Race Series bearings are well suited to engines being prepared for:
- Fast-road performance
- Turbocharged applications
- Increased boost
- Track-day vehicles
- Drift cars
- Motorsport
- Competition engines
- Performance engine rebuilds
- Forged SR20 builds
- High-RPM applications
Correct bearing clearances must always be checked by the engine builder during assembly.
Key Features
- Genuine ACL Race Series main bearing set
- Suitable for Nissan SR20DE and SR20DET
- Standard / STD bearing size
- High-performance F780 tri-metal construction
- High-strength bearing overlay
- Designed for improved fatigue resistance
- Suitable for increased RPM and performance applications
- Upper and lower main bearing shells
- Excellent choice for performance engine rebuilds
- Suitable for naturally aspirated and turbocharged SR20 builds
- Precision-engineered performance bearing solution
- ACL part number 5M2964H
- Excludes GTi-R SR20DET applications
Technical Specifications
| Specification | Details |
|---|---|
| Brand | ACL |
| Product Range | Race Series |
| Product Type | Main Bearing Shell Set |
| Manufacturer Part Number | 5M2964H |
| SKU | 5M2964H |
| Engine | Nissan SR20DE / SR20DET |
| Engine Capacity | 2.0L |
| Engine Configuration | Inline 4 |
| Bearing Size | STD / Standard |
| Bearing Material | F780 |
| Bearing Construction | High-Performance Tri-Metal |
| Half Type | Upper & Lower |
| Minimum Standard Shaft Size | 54.956 mm |
| Maximum Standard Shaft Size | 54.980 mm |
| Minimum Standard Tunnel Size | 58.944 mm |
| Maximum Standard Tunnel Size | 58.968 mm |
| Maximum Wall at Crown | 1.975 mm |
| Maximum Overall Length | 19.1 mm |
| GTi-R Compatibility | No |
Why Choose ACL Race Series Bearings?
ACL is one of the most recognised names in performance engine bearings, with Race Series products widely used in tuned road cars and motorsport engine builds.
For an SR20 engine operating at increased boost or RPM, maintaining correct crankshaft support and oil clearance is critical. ACL Race Series bearings are engineered specifically for demanding performance environments where conventional replacement bearings may not offer the required level of durability.
The ACL 5M2964H STD main bearing set is therefore an excellent choice for anyone rebuilding a Nissan SR20DE or SR20DET engine using a standard-size crankshaft.
Typical Nissan SR20 Applications
Depending on market, chassis and engine configuration, SR20DE/SR20DET engines are found in vehicles including:
- Nissan Silvia
- Nissan 180SX
- Nissan 200SX
- Nissan Primera
- Nissan Bluebird
- Nissan Avenir
- Other Nissan models equipped with compatible SR20DE/SR20DET engines
Always confirm the engine code and crankshaft dimensions before ordering. GTi-R applications are excluded.
Installation Notes
Professional engine assembly is strongly recommended.
Before installation:
- Measure crankshaft main journals
- Check crankshaft condition
- Confirm bearing oil clearance
- Check main bearing tunnel dimensions
- Ensure the crankshaft is standard size when ordering STD bearings
- Follow the engine builder’s required bearing-clearance specification
- Use appropriate assembly lubricant during installation
Do not select bearing size purely from vehicle registration or engine code where the crankshaft has previously been machined.
