Engine Simulator — Play Engine Sim Online Free
This free online engine simulator is Engine Sim — the open-source internal combustion engine simulator by Ange Yaghi — compiled to WebAssembly and running fully in your browser. It simulates gas dynamics, combustion, and the exhaust system in real time to produce authentic engine sound: you crank the starter, toggle the ignition, work the throttle and gearbox, and run the engine on a dyno while live gauges track RPM, torque, and power. It is keyboard-driven like the desktop original, free with no account, and nothing is uploaded — the whole simulator runs on your device.
Engine Sim
The open-source Engine Sim in your browser — start it, rev it, and actually hear the engine.
Loads the official app — nothing is uploaded, and your files stay on this device.
This is a desktop-class app — it works best on a larger screen.
Engine Sim is by Ange Yaghi (MIT, open source); this is the v0.1.11a community WebAssembly port, embedded unmodified from its public host.
Keyboard Controls
| Key | Action |
|---|---|
| S | Hold to crank the starter motor |
| A | Toggle ignition |
| Q / W / E / R | Throttle positions, low to full |
| Space + Scroll | Fine throttle adjustment |
| Up / Down Arrows | Shift gears |
| Shift | Clutch (hold with Space to engage gradually) |
| D | Toggle dyno mode |
| H | Enable RPM hold (G + scroll sets hold speed) |
| 1 – 5 | Simulation time warp |
| Z + Scroll | Volume |
| Tab | Change screen |
Quick Answer
This free online engine simulator is Engine Sim — the open-source internal combustion engine simulator by Ange Yaghi — compiled to WebAssembly and running fully in your browser. It simulates gas dynamics, combustion, and the exhaust system in real time to produce authentic engine sound: you crank the starter, toggle the ignition, work the throttle and gearbox, and run the engine on a dyno while live gauges track RPM, torque, and power. It is keyboard-driven like the desktop original, free with no account, and nothing is uploaded — the whole simulator runs on your device.
How It Works
Click Launch — the simulator (about 6 MB) loads in the page
Hold S to crank the starter motor with the ignition off, then press A to toggle the ignition and hear it fire
Rev it with Q, W, E, and R (increasing throttle) and shift with the up and down arrows
Press D for the dyno screen, H for RPM hold, and the number keys for time warp
Key Facts
- The real open-source Engine Sim by Ange Yaghi (MIT license), not a lookalike
- Real-time combustion and gas-dynamics simulation with synthesized engine audio
- Dyno mode, transmission with clutch and gears, RPM hold, and time warp
- Live analog gauges: RPM, torque, horsepower, and engine telemetry
- Keyboard-driven exactly like the desktop version
- Runs entirely in your browser via WebAssembly — no install, nothing uploaded
Frequently Asked Questions
Is this the real Engine Sim?
Yes — this is the original open-source Engine Sim by Ange Yaghi (github.com/ange-yaghi/engine-sim, MIT license), version 0.1.11a, compiled to WebAssembly so it runs in a browser. It is not a simplified clone: the same simulator core that models cylinder gas dynamics, combustion, and the exhaust system produces the engine audio you hear. Note that the newer "Engine Simulator" sold on Steam is a separate, closed-source product by the same author — this is his earlier, free, open-source release.
How do I start the engine?
Like a real car: hold S to spin the starter motor with the ignition off, then press A to switch the ignition on and the engine fires and idles. From there, Q, W, E, and R set increasing throttle positions, the up and down arrows shift gears, and holding Shift works the clutch. The full keyboard map is listed on this page.
Does it work on phones and tablets?
It is keyboard-driven, like the desktop original, so a physical keyboard is effectively required — a desktop or laptop is the right way to play it. The simulator itself runs fine in any modern desktop browser; no install and no account are needed.
Is the engine audio real or recorded?
It is synthesized in real time from the physics. Engine Sim models the pressure waves in each cylinder and the exhaust system, then converts them into sound — so the tone, rasp, and pulse change live as you change RPM, load, and throttle. That is the project’s signature feature and the reason it became famous.
Can it simulate my exact engine or predict power numbers?
Not precisely. The author is explicit that Engine Sim is an audio-and-response simulator, not a scientific tool: it is built to sound and behave like an engine, not to produce accurate engineering figures for tuning. For quick estimates of real-world numbers, the horsepower and mileage calculators on this site are a better fit.
Who made Engine Sim, and is it really free?
Engine Sim was created by Ange Yaghi (AngeTheGreat) and released as open-source software under the MIT license. This embed runs that open-source release, compiled to WebAssembly by a community port, and adds no account, trial, or watermark. The project later moved to a paid model for its much larger successor, but the original version running here stays free under its license.