I have a nose coming from the engine it sounds like its knocking but its not

There's no way to answer that for sure.... Have a 'mechanic' listen to it, even if you have to leave it for awhile, there are several possibilities and guessing at it ain't going to help!.. Best to get it checked out..

This sounds to me like the upper end of the engine. Usually happens from the oil draining back into the oil pan, then having to pump it all back up when you start it. Its usually classified as normal, but I'd wait for it to stop making the noise before you start driving as usually thats the noise for no lubrication. Also when did you last get your oil changed? In my personal experience, this is caused by the oil not being, what I say, silky enough to stay on the top end while shut off... Instead, if you don't change it often enough, it'll literally just be like water and run down into the pan and not have anything on the top end... So, if you're overdue or due for an oil change, that noise will also happen.