Engine Setup¶
The engine is built from real components. Choose a base, then fit parts around it; the simulation derives the engine's character from them.
The build is modular¶
You pick a base from a short list, then fit parts around it. The base sets the bore, stroke and cylinder count; you then choose the rotating assembly, head, cam, and breathing hardware. From those parts the sim derives the engine's defining numbers:
- Displacement from bore, stroke, and cylinder count.
- Compression ratio from piston and head geometry.
- A mechanical RPM limit set by the weakest part (hidden — you find it by pushing).
- Inertia (throttle response, idle stability) from the rotating masses.
- Breathing (VE) from head flow, cam timing, intake, and exhaust.
Changing any part rebuilds the engine: it stops (ignition off, neutral), all temperatures reset to ambient, and wear resets to new.
Compatibility is enforced¶
Each dropdown lists only parts that fit the selected engine base. Switching base reloads that engine's default parts and its factory tune, and asks for confirmation if you have unsaved tuning. This keeps builds physically coherent — you can't bolt incompatible hardware together and expect the sim to pretend.
Rule of thumb
Build for a goal. A torquey street engine and a peaky race engine want different cams, runners, and headers — the components interact, so choose them as a set, not in isolation.
The specification summary¶
The SETUP page shows a summary of the build: Displacement (with cc), Bore × Stroke,
Compression Ratio, Rod/Stroke Ratio, Fuel Type (petrol), Induction (Naturally Aspirated),
Rev Limiter (your own setting — see Rev Limiter) and Total Inertia.
Shipped parts¶
| Part | Choices |
|---|---|
| Engine base | STANDARD I4 1.8L DOHC · V8 5.7L OHV · 4.7L V12 65-Degree DOHC |
| Crankshaft | STANDARD Forged Steel · RACE Billet Lightweight · V8 5.7L Nodular Iron · V12 4.7L Forged Steel |
| Pistons | STANDARD Flat Top · RACE Forged Dome 10.5:1 · V8 Hypereutectic · V12 Forged Dome |
| Connecting rods | STANDARD I-Beam 128 mm · RACE H-Beam 128.3 mm · V8 PM 154.9 mm · V12 Titanium 118.5 mm |
| Cylinder head | STANDARD DOHC 16V · RACE DOHC 16V · V8 Cathedral Port (2-valve) · V12 DOHC 5-Valve |
| Camshaft | STANDARD Street DOHC (240° intake) · I4 Race DOHC (290°) · V8 OHV Hydraulic Roller (204°) · V12 DOHC Race (290°) |
| Intake manifold | STANDARD NA · RACE Short Runner NA · V8 Composite Long Runner · V12 Variable-Length |
| Exhaust header | STANDARD 4-2-1 Header · RACE 4-2-1 Header · V8 Cast Iron Log Manifolds · V12 6-into-1 Headers · V12 Race Decat Headers |
| Fuel injectors | STANDARD 240 / 285 / 370 cc port · V8 420 cc · V12 340 cc sequential port |
| Engine mounts | STANDARD Rubber Mounts · V8 Solid Rubber Mounts · V12 Solid Stressed-Member Mounts |
| Flywheel | Ultra-Lightweight · Race · Sport · Street · V8 Balanced Steel · V12 Lightweight |
| Clutch | STD Single Disc · RACE Ceramic · V8 Heavy Duty · V12 Twin-Plate Dry |
| Gearbox | STD 5-Speed · V8 6-Speed · V12 6-Speed Gated Transaxle |