Parked Car Engine Rev

How it's made

Source

four-stroke combustion fires at cylinders * rpm / 120 Hz; 720-850 rpm idle rises to 3800-7200 rpm. Rounded bipolar pressure pulses and short noisy gas bursts model each firing.

Body

exhaust cavities colour the pulse train at 115-190 and 360-560 Hz with broad Q 0.8-1.4; a load-dependent 650-3100 Hz low-pass opens under throttle, then closes on overrun.

Layers

pulsed exhaust pressure dominates; firing-modulated pink turbulence adds roar, filtered white noise adds intake rush, and quiet crankshaft orders supply block vibration and valve whirr.

Envelope

180 ms initial idle, a smooth inertial rise, 120-480 ms near peak, then a slower return to idle by 2.1-2.4 s. Idle remains before a 190 ms editorial fade; the engine does not switch off.

Variation

seeded firing timing varies by 0.5-1.4 percent and pulse strength by 6 percent. Four-cylinder, uneven-bank eight-cylinder, high-rev sport and short throttle-blip presets vary firing order, peak rpm, inertia, throttle hold and exhaust damping rather than just output gain.

Space

dry, stationary and centred; no pass-by, gear shift, tyre noise or room reverberation.

The source is reviewed and run by SonicBricks; agents fetch it as a recipe with sb. It is not published on this page.