M20 5-Axis CNC Cylinder Head Porting by 5150 AutoSport

5150 AutoSport 5-Axis CNC Cylinder Head Porting for BMW M20 Engines

Please note that price is based on customer providing core. If you need help sourcing a core, please contact our sales team. Also note that this service includes a 1-2 week turnaround time for service completion, beginning when the 5150 Team receives your head.

Investing in cylinder head porting for your high-performance BMW engine enhances airflow efficiency for improved engine power, throttle response, and overall performance. By optimizing the intake and exhaust passages, porting reduces restrictions, allowing the engine to breathe better and generate more horsepower and torque.

We only use CNC equipment, ensuring that each port is machined to the exact same specifications, providing uniformity across all cylinders. This precision is crucial for maintaining consistent performance and efficiency.

Service Includes:

Total Disassembly, Cleaning, & Inspection

Our skilled technicians carefully disassemble and inspect each component for any damage, unusual wear, cracking, warping, etc. and perform leak, crack, and pressure testing to ensure the cylinder head is a good candidate for modifications.

During the cleaning process, techs are able to remove all built up contaminants, such as carbon deposits and oil sludge. Properly cleaned and prepared services are essential to ensure precise port and polish modifications, and establish a baseline for implementing performance modifications accurately.

Multi-Angle CNC Porting

Porting involves modifying the intake and exhaust ports of the cylinder head to improve the flow of air and fuel into the combustion chamber and the expulsion of exhaust gases out of the chamber.

The first step of this process involves assessing the cylinder head's current flow characteristics to identify any restrictions or turbulence. Then, material is carefully removed from the walls of the intake and exhaust ports to simultaneously enlarge them and improve their shape for optimal flow. The result is a smoother, more direct path for air and fuel into the combustion chamber, as well as a smooth, more efficient path for exhaust to flow out of the combustion chamber. 

Because we use CNC machining, we can ensure each port is exact and even across the cylinder head. This means airflow is balanced across all cylinders. Benefits of porting include increased airflow for more power and improved throttle response. 

BMW M20B20 Applications:

BMW 3 Series

1977-1982     E21     320 / 326
1982-1994     E30     320i

BMW 5 Series

1977-1981     E12     520 / 526
1981-1987     E28     520i

BMW 7 Series

1981-1987     E23     720i

BMW M20B23 Applications:

BMW 3 Series

1977-1982     E21     323i
1982-1994     E30     323i

BMW M20B25 Applications:

BMW 3 Series

1985-1993     E30     325i / 325is / 325ix

BMW 5 Series

1987-1990     E34     525i

BMW M20B27 Applications:

BMW 3 Series

1982-1987     E30     325e / 325es [North America]

BMW 5 Series

1982-1987     E28     525e / 528e