im trying to think of a way to describe the sound. thinkning about it, you know the rattle you get when your in a too low gear for the speed and you try to accelerate but just get a jingle from the engine, it sounds like that and kinda like a wastegate.

if i think about it like this, it does relate back to the sump;

i bought the car, it was fine, with a small oil leak from the gasket. nothing to major. drove it home at about 80mph for an hour or so, as i got close to home i heard a loud ticking (the low oil ticking you get) so i got out, and there was defintly a major oil leak. i must have destroyed the gasket or the sump. or both. so i changed the gasket, but it was a diy job, still a bolt missing, and i pobably didnt get it perfect, and yea they are hard! filled with oil, jump started the car, and all was good. reved it and i heard this knocking noise from underneath the rocker cover! the only think changed is the sump gasket, so that must be the problem right? i would have head or felt something else if the bottom end was going??