Evening all just a quick post. I noticed today that at lower revs or when pulling off there is a strange noise coming from my engine bay it doesn't sound like knocking but similar it's hard to explain. When people say their bottom end is knocking what does it sound like is it like a knocking sound when you knock a front door or is it more like the sound when your tappets have gone like a old escort or fiesta sounds. Please help people just want some advice as to what could be the problem.

 

Knocking:

http://www.youtube.com/watch?v=J0_nIqSa6wM

 

could be a collapsed tappet i had a similer noise on my classic. is it on one side of the engiene if so def tappet

 

or hopefully just a heat sheild or something you should be able to hear bottom end rattle at idle even in the early stages and no i doesnt sound like some1 knocking on a door if you shake and spray can and you hear the noise the bearing makes think if that bearing was bigger thats the sort of noise