A V12 engine you can run, slice and take apart

Every part of this 6.0-litre 60° V12 — the crankshaft with its six throws, twelve pistons and rods, four camshafts, 48 valves with their springs and buckets, two timing chains, the flywheel and clutch — was modeled as an exact solid in the NativeCAD kernel and is running here from one number: the crank angle. Drag to orbit, scroll to zoom. Slow it down, slice the block open, colour the four strokes, pull it apart, then bolt a gearbox on.

How a four-stroke engine works

Why twelve? With cylinders firing every 60°, there is always a power stroke going on somewhere — in fact three overlap at any moment — so the crank is pushed almost continuously and the engine runs turbine-smooth. The 60° V is what makes the even firing work: each crank throw carries two rods, one from each bank, and the throws are set 120° apart like a straight-six.

The engine on this page

Parts list

361 unique parts, 2,898 instances on screen. Every solid below was built once in the kernel (faces = B-rep faces of the exact body) and placed by the viewer; the valve spring is the one procedural part, because it has to compress. Parts modeled: 286 of 424. Harness: 35 routed leads carrying 95 conductors, 3.11 m of wire over 4.28 m of loom trunk.

What bolts on next

The rear of the engine ends in a standard interface: a flywheel on the crank flange, a clutch, a bellhousing flange and a splined input shaft. That is exactly where a gearbox page will pick up — then a driveshaft, a differential, wheels, a car. Each will be its own set of exact kernel parts driven by the same crank angle, so the whole driveline can run from one dial.

Build notes

Built from a kernel command document — the same ops the NativeCAD MCP exposes. Every boolean was kept on the exact fast path (cylinders piercing planar faces), which is why the crank is seven journals joined through its webs, the block's crankcase roof sits perpendicular to each bank, and the head is one per-cylinder section instanced six times. The few cases the kernel could not keep exact were logged as kernel bugs.

No screws to nowhere: every bolt and stud on the page lands in a hole that is actually cut. One joint table places the fastener AND drills what it passes through and threads into — tapped holes at the thread's nominal radius, clearance holes 0.5 mm over, which is also how the viewer decides where to draw a thread — so a station cannot be moved without the hole moving with it. A fastener audit re-measures that claim against the page's own meshes and instance matrices: all 400 fasteners seated, none floating, buried or standing off.

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