NRW 4130 Billet Chromoly VANOS Covers

BMW E9x M3 S65 4130 Chromoly Bolt-Through VANOS Covers

A Permanent, High-Strength Replacement for Aging OEM S65 Plastic VANOS Covers

Introducing the latest solution from NRW Design: the S65 4130 Chromoly Bolt-Through VANOS Covers, engineered specifically for the BMW E9x M3 and its high-revving S65 V8.

For years, S65 owners have asked NRW Design to develop a solution for the aging and deteriorating factory plastic VANOS covers. With several aftermarket replacement options already available, we initially felt there were sufficient solutions on the market.

Over time, however, we observed failures associated with both aging OEM plastic covers and aftermarket clip-in style designs. After seeing the potential consequences firsthand, we decided to approach the problem differently.

The result is the NRW Design 4130 Chromoly Bolt-Through VANOS Cover.

Why Replace the Factory S65 VANOS Covers?

As the E9x M3 platform continues to age, deterioration of the factory plastic VANOS covers has become an increasingly important maintenance consideration.

NRW Design recently encountered a customer vehicle where an OEM plastic VANOS cover experienced a complete failure. The resulting component failure allowed the VANOS spring to damage the valve cover and contributed to extensive engine damage.

That experience reinforced our decision to develop a replacement designed around material strength and positive mechanical retention rather than another clip-in solution.

Billet 4130 Chromoly Steel Construction

The latest version of our S65 VANOS covers is precision machined from billet 4130 chromoly steel.

4130 chromoly was selected for its excellent strength characteristics, allowing us to produce a compact, lightweight component capable of handling the demands of the S65 VANOS system.

Each cover features a single-piece design with no separate clip-in retention mechanism.

Bolt-Through Design

Rather than relying on a clip-in installation, the NRW Design VANOS covers utilize a bolt-through retention design using the OEM cam bolts.

This provides positive mechanical retention while eliminating reliance on an aging plastic cover or aftermarket clip-style design.

Installation follows the applicable BMW procedure for the camshaft/VANOS fasteners, including all required factory procedures and specifications.

Designed with Rotational Mass in Mind

Material selection and weight were important considerations throughout development.

Despite being manufactured from high-strength 4130 chromoly steel, NRW Design engineered these components to minimize unnecessary mass. The result is an exceptionally lightweight bolt-through VANOS cover designed to add as little additional rotating mass as practical.

Key Features

• Designed for the BMW E9x M3 S65 V8
• Bolt-through VANOS cover design
• Precision machined from billet 4130 chromoly steel
• High-strength single-piece construction
• Replaces aging factory plastic VANOS covers
• Positive mechanical retention
• Eliminates reliance on a clip-in cover design
• Engineered to minimize additional rotational mass
• Utilizes the OEM cam bolts
• Installation follows applicable BMW procedures
• Designed as a long-term VANOS cover solution
• Designed and manufactured by NRW Design in the USA

Installation note: Installation requires S65 camshaft timing tools and should only be performed by someone with the appropriate mechanical experience. Follow all applicable BMW procedures and torque specifications.

Protect Your S65 with a Purpose-Built Solution

The S65 remains one of BMW M’s most iconic engines, but these engines are now operating with components that have experienced years of heat cycles, mileage, and age.

The NRW Design S65 4130 Chromoly Bolt-Through VANOS Covers were engineered to replace the aging factory plastic design with a high-strength, positively retained solution built specifically for the S65 platform.

Billet 4130 Chromoly. Bolt-Through Retention. Engineered for the S65.

Designed and manufactured by NRW Design in the USA.