engine knockin

hi

my engine started knocking today, well i think its the engine.

i use only 91 octane fuel, new plugs, new wires, the knocking seems to be coming from the back of the engine and it gets faster as i push on the pedal. Could it be the alternator? I don't think it is because an alternator would be ticking right? help me out please


ps i'm only on for an hour so please reply

thanks