Porting Calculator V4.2.2

    It computes Jennings and Blair angle areas, as well as mean and time areas. These metrics determine the maximum airflow capacity of a port at a given RPM.

    Choose between Metric (mm, kW, Bar) or Imperial (inches, HP, PSI) using the radio buttons at the top of the interface. 2. Port Timing and Calculations

    is a specialized engineering tool designed for two-stroke engine enthusiasts and tuners to calculate critical porting dimensions and performance metrics. By analyzing "port maps"—digital or physical templates of an engine's cylinder ports—the software helps users determine if their engine's intake, transfer, and exhaust ports are "tuned" to work in harmony for a specific RPM range. Key Features of V4.2.2

    The relationship between exhaust port flow and intake port flow, usually expressed as a percentage. Porting Calculator V4.2.2

    The software allows you to work forward from physical measurements or backward from a performance target:

    The button instantly reverts all porting changes, restoring the stock cylinder timing. This is invaluable for comparing multiple tuning iterations quickly.

    It's important to understand that while the program provides a unique calculation to determine delivery ratios and simulate horsepower and torque, the physical and mathematical modelling of a two-stroke engine involves many complex, interacting variables. As one user on a tuning forum noted, calculations for two-stroke engines are a complex subject that can't be solved without careful interpretation. It computes Jennings and Blair angle areas, as

    Completed port designs can be saved as high‑resolution PNG images (96 to 600 pixels/inch). At 96 dpi, the image prints at actual scale, allowing it to be cut out and used directly as a guide for grinding ports.

    : Faster data entry grids and seamless CSV exporting for CNC porting machinery. 2. Core Modules and Features

    : Buttons like "Clear Mods" or automated offsets for boost ports relative to main transfers. Output Units Key Features of V4

    Older versions struggled with cross-border ports (e.g., US to Canada or UK to EU). V4.2.2 introduces a that supports over 40 countries. It automatically identifies if a number is wireline, wireless, or VoIP-native.

    What’s good

    : It provides suggestions for carburetor size, calculates mean piston speed, and estimates ring flutter RPM. Key Usage Tips