Model engine builder

## Assemble. Tune. Ignite.

A pixel-art engine bench that fits in your pocket. Pick a calibre, build it part

by part, set the timing, then find out whether it actually runs.

Every engine goes together the way a real one does. Crank before rods. Gasket

before head. Cams last.

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## Four stages, every build

**1 · ASSEMBLE**

Drag each part into its own socket, in mechanical order. The next part you need

is the one that's glowing.

**2 · TORQUE**

The head deck, seen from above. Work the criss-cross sequence with a torque

wrench and release inside the green band. Pull too far and you strip the thread.

**3 · TIMING**

A drive gear turns under your finger. Stop it with the index mark dead on the

pointer. Every gear you catch spins the next one faster.

**4 · IGNITION**

Catch top dead centre on the compression stroke. The chamber tells you where you

are: blue on intake, yellow under compression, red when it fires, black on

exhaust. Time it right and the revs climb.

Finish the build and you get a spec sheet — bore, stroke, displacement, and the

RPM your work actually earned.

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## Six calibres, each built its own way

| Engine | What makes it different |

| --- | --- |

| **2-Stroke** | No cam, no valves. Ports do the timing — and you mix the oil yourself |

| **Diesel** | Compression ignition, gear-driven cam, injector in the head crown |

| **OHV** | Cam low in the block, pushrods climbing past the bore to the rockers |

| **DOHC** | Twin cams above the head, spark plug down the valley between them |

| **Twin** | Two bores, one cam, a plug per cylinder |

| **Inline 4** | Ten head bolts, nine timing events, firing order 1-3-4-2 |

The two-stroke skips the cam entirely and hands you a measuring cylinder instead:

pour the oil, hit the ratio, don't run it lean.

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## Controls

One thumb. Drag, hold, tap. Nothing else.

Runs in the browser on phones and desktop.