Product Description
BMW N51/N52 Race Series Engine Build - ZNM Performance
ZNM Performance Race Series Engine Build Program
Introducing our BMW N51/N52 engine program—designed for enthusiasts seeking maximum reliability, precision machining, and performance enhancements for BMW’s naturally aspirated inline-6. This page applies to all N51 and N52-equipped models, including the E90/E92 328i, E60 528i, X3, X5, and more.
The BMW N51 and N52 feature 3.0L inline-6 architectures with Valvetronic and dual-VANOS systems. While known for smooth power delivery and daily reliability, these engines are often limited by factory bearing wear, VANOS gear bolt issues, and insufficient head clamping when subjected to high RPM or track abuse.
That’s where our N51/N52 engine build program comes in. Every engine is fully disassembled, cleaned, and measured. We perform custom block prep, precision deck surfacing, and upgrade internals for improved performance and long-term durability. Whether you’re building a road race car or a high-revving street setup, our Race Series N51/N52s are engineered for the job.
Our facility in Pompton Lakes, NJ builds engines for customers across the U.S. and internationally. All engines are fully disassembled, measured, and assembled in-house with final clearances precisely set by our team. Please inquire about international shipping options.
Key Features and Options for Our Built N51/N52 Engines
- Upgraded forged pistons and connecting rods for increased strength
- Deck reinforcement and head stud conversions for improved clamping force
- Custom head gasket solutions for high-compression or endurance builds
- Built to handle 300–400whp NA or up to 600whp boosted with proper conversion
Cylinder Head Upgrades for Your N51/N52
- Upgraded titanium valve springs and retainers
- Port and polish services available for improved airflow and velocity
Bearing Upgrades for Your N51/N52
- ACL or King performance bearings
- Blueprinted bearing clearances set in-house for optimal longevity
Frequently Asked Questions (FAQ)
Q: Can the N51/N52 be built for boost?
A: Yes. While originally designed as a naturally aspirated platform, the N51/N52 can be safely turbocharged with proper block reinforcement, forged internals.
Q: What limits the factory N52 at high RPM?
A: The stock rotating assembly and valvetrain are not designed for sustained high RPM or competition use. Our builds address this with upgraded springs, forged pistons, and dynamically balanced rotating assemblies.
Q: Can I daily drive a Race Series N51/N52?
A: Absolutely. Our engines are built to OEM+ standards with durability and smooth drivability in mind. We match each build to your intended use case, whether it's a daily commuter or a time-attack weekend car.
