This simulator renders a complete 90° cross-plane V8 engine — 8 cylinders, a 4-throw crankshaft, camshaft, valve springs, timing gears, and a flywheel — driven by real slider-crank kinematics rather than a looping animation. Set the engine speed anywhere from idle to 6,000 RPM, step through crank rotation one degree at a time, switch between four camera presets and three display modes (Cutaway, Solid, Single-cylinder), explode the assembly to see how the two banks come apart, and click any cylinder in the firing-order strip to track its own crank angle, stroke, chamber pressure, valve lift, and live pressure-volume (indicator) diagram.
• Real slider-crank piston motion — piston position is computed every frame from crank angle using the actual slider-crank relationship, so piston velocity and acceleration change correctly through the stroke exactly as they do in a real engine. • Cross-plane crankshaft — 4 throws spaced 90° apart, each shared by one cylinder from each bank, matching the real 90° V8 crank used by cross-plane V8s. • Firing order 1-8-4-3-6-5-7-2 — the classic cross-plane firing sequence, with each cylinder's stroke state, crank angle, and chamber pressure computed from its own phase offset within the 720° four-stroke cycle. • Per-cylinder telemetry — click any of the 8 cylinders in the firing-order strip to track it: current crank angle, active stroke (Intake/Compression/Power/Exhaust), chamber pressure in bar, and a live valve-lift chart. • Indicator (P-V) diagram — a live pressure vs. piston-position plot for the tracked cylinder, showing the classic four-stroke indicator card shape. • 4 camera presets — ISO (3/4 view), Front, Side, and Top. • 3 display modes — Cutaway (translucent cylinder sleeves showing internals), Solid (opaque valve covers and oil pan), and Single (isolates the selected cylinder). • Explode view — pulls the two cylinder banks and heads apart along their bore axis so the valvetrain, cylinder barrels, and crankcase are all visible at once. • Transport controls — play/pause, ±15° single-step crank rotation, adjustable playback speed, and an engine speed slider from 400 to 6,000 RPM.
Each cylinder in a four-stroke engine completes one power cycle every 720° of crankshaft rotation — two full revolutions. The cycle has four phases: intake (piston travels down, intake valve open, drawing in air and fuel), compression (piston travels up, both valves closed, compressing the charge), power (the spark ignites the compressed mixture just before top dead center, and rapidly rising cylinder pressure drives the piston down through the crank and connecting rod), and exhaust (piston travels up again, exhaust valve open, expelling spent gases).
A cross-plane V8 crankshaft has its four throws arranged 90° apart rather than in a single plane, which is what allows an even 90°-spaced firing interval between cylinders — one cylinder fires every 90° of crank rotation across the 720° cycle, giving the smooth, evenly-spaced power pulses cross-plane V8s are known for. This is different from a flat-plane V8 crankshaft (throws 180° apart, common in high-revving performance and racing engines), which produces a different, less evenly spaced firing rhythm and exhaust note.
The connecting rod and crank throw together form a slider-crank mechanism: as the crank rotates at constant angular velocity, the piston's linear velocity is NOT constant — it moves fastest around mid-stroke and slows to zero at top and bottom dead center, which is exactly what the kinematics driving this simulator reproduce.
Chamber pressure stays near atmospheric during intake and exhaust, climbs through compression as the piston squeezes the charge into a fraction of its original volume, then spikes just after top dead center on the power stroke as combustion drives cylinder pressure well above the compression peak, before falling away as the piston descends and the exhaust valve opens for blowdown.
The valve lift chart plots intake and exhaust valve lift against crank angle across the full 720° cycle for the tracked cylinder.
The indicator diagram (a pressure-volume, or P-V, plot) is the classic way engineers visualize a four-stroke cycle: piston position stands in for cylinder volume on the horizontal axis, and chamber pressure is plotted on the vertical axis. The area enclosed by the resulting loop represents the net work done by the cylinder per cycle. Pressure, valve timing, and the indicator diagram in this simulator are illustrative models built to show the correct qualitative shape of each curve, not a validated thermodynamic simulation of a specific real engine.
A cross-plane crankshaft has its four throws arranged in two perpendicular planes, 90° apart, rather than all in one plane. This produces an evenly spaced 90° firing interval between all 8 cylinders across the 720° four-stroke cycle, which gives smoother, more evenly spaced power pulses and better inherent primary balance than a flat-plane (180°-throw) crankshaft. Most road-going V8s use a cross-plane crank for this smoothness; flat-plane cranks are more common in high-revving performance and racing V8s, which favor lighter rotating mass and better exhaust scavenging over ultimate smoothness.
Ignition is timed to occur just before the piston reaches top dead center on the compression stroke, so that peak combustion pressure develops right around TDC when the piston is best positioned to convert that pressure into rotational torque. Once the spark ignites the compressed air-fuel mixture, combustion releases its energy far faster than the piston moved during the relatively slow mechanical compression stroke, producing the sharp spike immediately after TDC that then decays as the piston descends and cylinder volume rapidly increases.
Firing order is chosen to spread combustion events as evenly as possible across the crankshaft's 720° cycle and to minimize torsional stress and vibration in the crankshaft and block, not to match the physical numbering of the cylinders. 1-8-4-3-6-5-7-2 is a classic cross-plane V8 firing order that alternates combustion between the left and right banks and keeps consecutive power strokes spaced 90° apart on the crank, which is exactly what the firing-order strip in this simulator highlights as each cylinder fires in sequence.
Cutaway mode keeps the engine fully assembled but renders the cylinder sleeves translucent so you can see the pistons, connecting rods, and crankshaft moving inside. Explode view instead physically pulls the two cylinder banks and their heads apart along the bore axis, separating them from the shared crankcase, so you can see how the valvetrain, cylinder barrels, and lower end relate to each other as distinct assemblies — closer to how a real exploded parts diagram works.
Solid mode shows the fully assembled engine with opaque valve covers and an oil pan in place, similar to how the engine looks from the outside in real life. Single mode instead hides every cylinder except the one currently selected in the firing-order strip, letting you isolate one cylinder's piston, rod, and valve gear without the other seven cylinders visually cluttering the view.