of jet engine noises I like the noise a C-130 makes right as the starter is engaged. it makes a big whoosh then a nice zzziiiinnnnggg sound as the engine spools up.
I like the sound of a big turbo on a big rig, especially when you here it spool up after a shift.
I love all of the noises old cars make. by old I mean cars from 1900-1950, back when every mechanism in the car made noise.
I also love the sound a big v-8 makes above 6000 rpm, like a Nascar car. it's an ear splitting growl. it's a different sound than a hot rod engine.
then there is the great sound of a v-12 racing engine. at high speed it doesn't sound like an engine at all, more like an air tool or a saw.
i could keep going and going. I observe the noise of every mechanical thing I can. it's part of my job, and sort of a hobby.