When a modification is decided upon through testing with an air flow bench, the original port wall material can be … See more

When the valve opens, the air doesn’t flow in, it decompresses into the low-pressure region below it. All the air on the upstream side of the moving disturbance boundary is completely isolated and unaffected by what happens o… See more

It is popularly held that enlarging the ports to the maximum possible size and applying a mirror finish is what porting entails. However, that is not so. Some ports may be enlarged to their maximum possible size (in keeping wit… See more

In addition to all the considerations given to a four-stroke engine port, two-stroke engine ports have additional ones:
• Scavenging quality/purity: The ports are responsible for sweeping as much exhaust out of the c… See more

The die grinder is the stock in trade of the head porter and are used with a variety of carbide cutters, grinding wheels and abrasive cartridges. The complex and sensitive shapes required in porting necessitat… See more

The internal aerodynamics involved in porting is counter-intuitive and complex. Successfully optimizing ports requires an air flow bench, a thorough knowledge of the principles involved, and engine simulation software. … See more