Engines on screen usually fail in one of two ways — they sound like stock loops or like someone holding a phone next to a tailpipe. These 202 recordings were made at the source with the right mics at the right distance: a V8 starting cold on a winter morning, a modern four-cylinder idling at a junction, a motorbike pulled close to redline, and a heavy-duty fire engine with its siren running while the engine works underneath.
The cold-start clips include the full warm-up arc with the choke audible, so a morning-departure scene gets a real slow build instead of a cut-to-idle. The long idle takes — three to five minutes of stable RPM — loop under dialogue without seams the audience can hear. Pass-bys have separate approach and tail halves you can crossfade at any speed for a chase. Pull what you need; the whole collection is a free download for commercial use, no watermark.