Some cutting compounds smell pretty nice such as Molyslip and I agree with you about the WD. I'm not sure if it comes under the 'engineering' category but LHM, which is the hydraulic fluid used in some citroen's smells quite funky as well. If you ever walk into a citroen specialist you'll know what I mean.
It's got to be wood that's been cut with a blunt powertool. You know, blackened edges, and all that.
Instantly transports me back to third-form woodwork class.
Not really 'engineering smell', but it's a nice smell for me.
I actually like the general smell of an engineering/fab shop too, It's such a mixture of different smells but no matter which one you go in, they all seem to smell the same.
Friday morning 10.00 am tea break........Bacon butty and brown sauce sandwiches.
When I worked in a fab shop, everyone used to have a Bacon Sandwich on a Friday morning break, Fridays was ace because it used to be early finish too........or Overtime
Original soluble oil flood cooling on a lathe gently steaming up in use.
Finish a session and its on your hands and clothes.
mmmm machinists aftershave...
Synthetic coolants just don't smell the same, mind you they don't go rank and stink the place out when they curdle after 3 months either...
Probably gear oil. Had a '51 Willys Jeep CJ3B. The smell of something similar brings back fond memories.
Simple, 1 wire to coil, 1 vacuum line to windshield wiper. Plenty of room to work. Rewired the entire electrical system in an afternoon (and added turn signals.)
Had 4 shift levers on the floor. Lots of places for the gear oil smell to get inside
Duck oil. My dad used to work in ships engine rooms and they would give them cans of the stuff to use for degreasing. Far too good for that he thought, so chucked it in the back of the van and went out and bought a tin of parrafin. We now have a stockpile of the stuff and it gets used for spraying the lathe down after use (highly necessary when the shed leaks as much as it does). Smells gorgeous. Will be a shame when it runs out cos its bloody pricey stuff.