Overview & Quick Start

Engine Calculator computes the theoretically optimal spark advance for each cell

in a two-dimensional operating map (RPM × manifold absolute pressure). It models

the complete combustion thermodynamic chain — from cam-driven volumetric efficiency

and intake charge temperature through Arrhenius autoignition kinetics and knock

onset — to determine the maximum advance achievable before knock limits the timing.

Quick Start

1. Set Engine Geometry — Enter bore, stroke, connecting rod length, and static

compression ratio on the Engine page.

2. Set Map Range — Set the RPM axis (min, max, step) and MAP axis. For NA

engines set MAP max = 0 psig. For turbo set MAP max to above wastegate setpoint.

3. Configure Cylinder Head — Select a chamber type and enter flow bench data

for intake and exhaust valves on the Cylinder Head page.

4. Configure Cam — Select a cam preset or enter all timing events at 0.050"

lift on the Cam Spec page.

5. Configure Manifold — Enter runner length, diameter, and plenum volume.

6. Configure Fuel — Select fuel type or enter custom properties.

7. Configure Turbocharger (if applicable) — Enable turbo, select or enter

turbo specs, set wastegate setpoint.

8. Click ▶ Compute — The calculator builds the VE, AFR, IAT, and EMAP tables,

then computes the full timing map and dyno simulation.

On launch the application loads a V53 equivalent project: