Chapter 00 — The object
A four-stroke engine built from nothing but code, turning in the dark. There is no model file here and there is no texture. Every surface is a number, lit by a studio built in the same code. Once it is cut open, the glow inside follows whichever cylinder is firing.
Chapter 01 — The section
A closed engine tells you nothing, so the casting is sectioned. The block, the head and the bores are cut away on a plane you control; the mechanism behind them is left whole, exactly as an engineering cutaway is made.
Chapter 02 — The cycle
Piston height comes from the exact slider-crank equation, and the connecting rod is solved from its two ends, so it is always precisely 143 mm long. Nothing is keyframed and nothing drifts.
Chapter 03 — The breath
Every cam in this engine is generated from the same function that moves its valve, so the lobe and the valve cannot disagree. That is not a shortcut. On a real engine it is the same relationship.
Chapter 04 — The proof
Torque is integrated from a pressure–volume diagram across the whole 720° cycle. Move the compression ratio and the curve answers, because the curve is the answer.Hold the throttle and the torque below answers: it is worked out from that integral, not looked up.
Shown in slow motion · figures are the true valuesFrozen · figures held · drag to turn the crank
Full load at this ratio
Drag to turn itDrag to turn the crank · click a piston to follow it · double‑click to reset
Geometry built in code from the simulation's own numbers · bore 86.0 × stroke 86.0 mm · naturally aspirated · shown in slow motion, the figures are the true values