One of my favorite thing to do is recording machine sounds! I just love these sounds and for music making or sound design, you can do a lot!
I recorded this one while I drove up to the Danang industrial harbor to record the ambient of the container port! Incredible soundscape by the way and on my way back I saw this truck and a person sleeping in it! The engine was running so why not making this recording! I walked around the truck and recorded the engine that you can listen in the beginning and then I moved to the exhaust and placed the recorder next to it.
It has a fantastic rhythm so listen to yourself! The length of the file is around 2:30 min. I recorded this sound with the Zoom H6 in 96/24 WAV. You can download the sound for free on my @DSound account by clicking on the link down below!
Have fun with the sound! :)