Instead of relying solely on hand grinding or conventional porting tools, Extrude Hone AFM uses abrasive flow machining (AFM). A semi-solid polymer media containing abrasive particles is forced through the intake manifold under controlled pressure. As the media travels through the runners, it conforms to the existing geometry and smooths internal surfaces that may be difficult to reach consistently by hand.
Intake manifolds are one of the most common automotive applications for AFM because the quality of the internal flow path can influence how efficiently air reaches the cylinders. Extrude Hone AFM reports potential flow improvements of up to 25 percent in suitable intake-manifold applications, although results depend on the individual manifold and complete engine configuration.
Why Port an Intake Manifold?
An intake manifold may leave the casting or manufacturing process with rough internal surfaces, uneven transitions, burrs, or inconsistencies among individual runners.
These features can interfere with smooth airflow.
For a performance engine, the objective is not simply to create the largest possible port. The goal is to improve the pathway air follows through the manifold while preserving geometry appropriate for the engine.
AFM can help address:
- Rough cast surfaces
- Irregular internal transitions
- Difficult-to-reach runner walls
- Minor burrs and raised features
- Uneven surface finish
- Flow differences caused by internal restriction
Because the abrasive media moves throughout the runner, it can reach areas that conventional hand tools may not access effectively.
AFM Porting vs. Hand Porting
Hand porting can be useful, but its effectiveness depends heavily on access and operator skill.
A technician must physically reach the surface with a tool. Deep bends and enclosed runners may make this difficult, and aggressive grinding can create unevenness or alter one area more than another.
AFM works differently.
The polymer media conforms to the passage itself. The abrasive is distributed throughout the media, allowing material to be removed along the internal flow path rather than only where a grinder can reach.
Extrude Hone AFM's existing porting information specifically emphasizes that AFM can improve an entire passage and produce a more uniform result than hand-only methods.Improving Intake Airflow
The intake manifold helps distribute incoming air toward the cylinders.
Reducing unnecessary restriction can support improved volumetric efficiency. In a properly configured performance engine, that may contribute to gains in horsepower, torque, throttle response, and combustion efficiency.
Extrude Hone AFM reports flow increases of up to approximately 25 percent after intake-manifold AFM in suitable applications. This should not be interpreted as a guaranteed horsepower increase. Final engine performance depends on cylinder heads, camshaft, exhaust, fueling, forced induction, displacement, tuning, and other factors.Los Angeles Performance Applications
Southern California has a deep automotive culture that includes racing, restoration, imports, custom builds, performance street cars, motorcycles, and specialty engine machining.
AFM can be especially useful for:
- Performance intake manifolds
- Rare or discontinued manifolds
- Custom engine combinations
- Racing applications
- Restoration projects
- Components that cannot be reached effectively by hand
For manufacturers, the repeatability of AFM can also be useful when multiple similar components require consistent internal finishing.
Controlled Material Removal
Extrude Hone AFM controls intake-manifold porting through variables including abrasive size, abrasive concentration, media formulation, pressure, tooling, and processing cycles.The objective is controlled flow improvement rather than indiscriminately enlarging the runners.
Different materials also require different approaches. Aluminum manifolds, for example, may require a lighter abrasive strategy than harder cast-iron parts.
Request Intake Manifold Porting
Call (562) 531-2976 to discuss intake manifold porting for Los Angeles, CA with Extrude Hone AFM. Information about your manifold, engine configuration, material, and goals will help determine whether AFM is appropriate.
Intake Manifold Porting FAQs
Is AFM better than hand porting for every intake manifold?
Not necessarily. The best process depends on the part and objective. AFM is particularly valuable where internal geometry is difficult to reach consistently by hand.
Can AFM improve airflow through an intake manifold?
Yes. Extrude Hone AFM reports flow improvements of up to approximately 25 percent in suitable intake-manifold applications.
