Abrasive flow machining uses abrasive-filled polymer media to smooth and refine internal engine passages.
Because the media conforms to the passage as it moves, AFM can address bends, runner transitions, and other areas that may be difficult to finish consistently by hand.
Automotive AFM Applications
Potential candidates include:
- Intake manifolds
- Exhaust manifolds
- Turbo impellers
- Turbo housings
- Pumps
- Cylinders
- Internal fuel passages
- Internal air passages
Why Engine Flow Matters

Air must enter, fuel must mix and burn, and exhaust must leave so the next combustion cycle can begin.
Unnecessary restriction in passages can limit that process.
Extrude Hone AFM reports that appropriate automotive AFM applications may increase fuel and air flow by as much as 25 percent.Improved flow may support horsepower, torque, volumetric efficiency, and more complete combustion depending on the engine.
Intake-Manifold Processing
For customers choosing one component, the intake manifold is often the strongest candidate.
Extrude Hone AFM specifically identifies the intake manifold as the part likely to provide the biggest performance improvement from extrude honing.AFM can work across runner surfaces and bends that are difficult to reach uniformly with traditional porting tools.
Kansas City Automotive Applications
The Kansas City region has a substantial automotive and transportation economy, along with performance shops, restoration specialists, racers, diesel enthusiasts, and specialty machining operations.
Automotive AFM may be valuable for:
- Performance builds
- Engine restorations
- Specialty vehicles
- Diesel applications
- Racing engines
- Custom or discontinued components
The process can supplement conventional engine machining rather than replacing the broader tuning and engineering required for a complete build.
Controlled Media Selection

An aluminum manifold may require a lighter abrasive treatment, while cast iron may tolerate a more aggressive approach.
Extrude Hone AFM also adjusts pressure, tooling, and processing cycles according to geometry and the amount of material that can safely be removed.Repeatable Flow Matching
Once processing conditions are established, AFM can be repeated on similar components.
This repeatability can help manufacturers or builders seeking more consistent flow between multiple passages or parts.
Call (562) 531-2976 to discuss Kansas City, MO automotive AFM with Extrude Hone AFM.
FAQs
Can AFM improve horsepower?
Improved flow may contribute to horsepower gains in an appropriately configured engine, but exact results depend on the complete system.
Can both intake and exhaust manifolds be processed?
Yes. Intake manifolds are especially common, and suitable exhaust manifolds may also be evaluated.
Does Extrude Hone AFM serve Kansas City customers?
Yes. Extrude Hone AFM provides automotive AFM for customers across the United States.




