nocking noise from inside of enginee

What you describe could be literally anything from a lifter ticking to a rod busted and banging against the cylinder wall, or a screw in a tire, or something wrong with the brakes, or something fell into just the right position to be getting hit by the fan, or a bad spot in the serpentine belt, or a failing water pump, or a bad bearing, or a busted blade in the turbo, or... Well, just about any of a thousand other possibilities.

Trying to diagnose a noise without being right there in person to listen to it is going to be almost impossible, especially as vague as your description is. Take it to a shop if you and/or your brother aren't mechanically inclined. Chances of finding any help here that's actually useful from such a vague symptom description are *EXTREMEMLY* slim - Most of us are reasonably handy with a wrench, but we can't work miracles based on "it goes "ta-ta-ta-ta-ta".