The “ack ack ack” of a Ducati dry clutch at idle. I’m sorry, but no other V-Twin sounds the same. When combined with the Desmodromic valves, and a full set of Termignoni pipes, there is no better sounding petrol fuelled vehicle save for Rossi’s MotoGP Desmosedici.
My old NC35 with a loud pipe, on the overrun (it used to pop and bang and backfire occasionally) was pretty good though too.
DT240 freehubs… Not showy like Hope/CK/Superstar/everyone else. Reassuringly firm click, that lets you know just how robust the mechanism is, but not so loud as to draw attention to itself.
A Perfectly engineering Kick Drum… As a House music fan, and a music producer, this is the Holy grail, and makes me go weak when I find it or manage to make one!
The Vulcan Bomber at full chat doing a near vertical climb is less of an audio feast than it is a visceral one. Amazing thing, the noise level (rather than tone) is incredible, and it shakes the earth for miles around.
The 1991 Le Mans winning Mazda 787B at full chat as it goes past sends a shiver down your spine. It’s pure evil! It must’ve been VERY tiring to drive for 24hrs compared to some of the much lazier engines fitted to the other cars competing.
Senna’s 1988 McLaren MP4/4 at full chat. A complex mix of sonically beautiful V6, combined with the delights of massive boost pressures, a very peaky power delivery, and huge horsepower. The most successful F1 car in history BTW.
There are others… But most of them are automotive based I’m afraid! 😉