Porting Calculator: V4.2.2 !!top!!

Features a 7k scrollable range, adjustable from 1k to 18k RPM.

: Supports switching between metric and imperial units (psi/bar, hp/kW) for broader usability. Version V4.2.2 Updates

) during which they remain open. This comparison between intake, transfer, and exhaust values ensures the engine has enough flow capacity to match its target RPM. Porting Calculator V4.2.2

[Gather Base Measurements] ➔ [Input Specs into V4.2.2] ➔ [Analyze Target Output Map] ➔ [Scribe Cylinder] ➔ [Grind & Chamfer]

While peak lift is important, 70% of the intake stroke happens at mid-lift. Features a 7k scrollable range, adjustable from 1k

A detailed HTML help file is included in the installation, covering every control and feature.

Porting Calculator V4.2.2 is a specialized digital engineering tool designed for engine builders, machinists, and automotive enthusiasts. It calculates critical cross-sectional areas, target air speeds, and velocity profiles required when grinding and shaping intake and exhaust ports. This comparison between intake, transfer, and exhaust values

: Computes exact durations for exhaust, main transfer, and intake ports (including piston port and rotary valve inlets). Mean Area Analysis : Displays required mean port areas in cm2c m squared

Making the port too large drops air velocity, destroying throttle response and low-end torque. V4.2.2 alerts you if your planned dimensions drop velocities below the critical 200 FPS threshold.

Porting two‑stroke engines is as much an art as it is a science. For decades, tuners have relied on a mix of experience, guesswork, and trial‑and‑error to shape cylinder ports for peak performance. But in the world of modern tuning, precision is everything, and that’s where specialised software like comes into play. This comprehensive guide explores everything you need to know about this powerful tool—from its key features and step‑by‑step operation to real‑world use cases and viable alternatives.