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Free Engine and Machine Sound Effects
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Engine audio is the one case where a single loop genuinely works, as long as you drive its playback rate from speed rather than triggering different clips. Find a steady idle loop, pitch it up with throttle, and you have something convincing in a few lines of code. Recordings taken from inside a vehicle and from outside it sound completely different, so decide which camera you're scoring before you pick.
Everything here is free to download from the source site. These results come from Freesound, OpenGameArt. Licences vary by file and are shown on each card. Nothing is hosted by us, and every link goes to the original page so you get the current version and the real licence terms.
F1 BR 06 Engine Starts.wavCC (see page)
EMD 567 engine notch 8 (synth recreation)CC (see page)
Volvo S60 start & idle, engine EM258.wavCC (see page)
Engines_8.wavCC (see page)
Marine diesel engineCC (see page)
Spaceship Engine - noise + heavy beep.wavCC (see page)
Remix of 115271__Timbre__synthetic_low_rev_engine.flacCC (see page)
Motorcycle Engine_50Km/h.wavCC (see page)
DeLorean DMC-12 (V6 PRV engine)CC (see page)
motorcycle_nsuMax_1954_engine.wavCC (see page)
Engine2.wavCC (see page)
E-type Jaguar, car engine, rev, idle ,mono.wavCC (see page)
EngineWarmup_1-Loop.wavCC (see page)
Engine 3CC (see page)
Warp Engine Engage SoundVarious CC
Car Engine Loop 96kHz, 4sVarious CC
Engine SoundVarious CC
racing car engine sound loopsVarious CC
Engine sounds(2)Various CC
Jet Engine TakeoffVarious CC
Fighter Engine FlybyVarious CC
Engine/Mechanic working soundVarious CC
Car engine Start Up 02Various CC
Space Ship engine soundsVarious CC
Car engine start 01Various CC
ENGINE ARCHONVarious CC
Zeta Engine Demo Theme (String Section)Various CC
Golgotha Game Engine Soundtrack (pub domain) by Crack.comVarious CCSearch all sound effects in the live asset library →
Using these sounds in a game
Download the highest quality version available, then convert for delivery rather than shipping the original. For the web, OGG Vorbis or compressed MP4 audio at a modest bitrate is fine for effects, and the difference is inaudible under gameplay.
Two habits cover most of the quality gap between hobby and professional audio: keep several variations of any sound that repeats, and randomise pitch slightly on playback. If you can't find the exact sound you need, the sound effect generator makes one from a text description, and the music generator handles the soundtrack.
Check the licence on each file. Freesound and OpenGameArt both host a mix of CC0, attribution, and share-alike work, and the requirements are per-file, not per-site.
Licences, briefly
CC0 means public domain: use it commercially, modify it, ship it, no credit required. That covers everything from Kenney, Quaternius, KayKit, Poly Haven, and AmbientCG.
Freesound and OpenGameArt host a mix. Some files are CC0, others are CC-BY (credit required) or CC-BY-SA (credit required and derivatives must carry the same licence, which is a real constraint on a commercial game). The licence is set per file by whoever uploaded it, so check the source page before you ship.
The complete guide to game asset licences covers what each one actually requires and where teams usually get it wrong.
More free sound effects
Free Footstep Sound Effects · Free Explosion Sound Effects · Free Ambient Sounds and Backgrounds · Free UI and Interface Sound Effects · Free Gun and Weapon Sound Effects · Free Water Sound Effects · Free Door and Interaction Sound Effects
Or search every source at once, and see the complete guide to free game assets for the full picture on where this art comes from and how to use it.