I have a 97' Civic EX with the D16Y8 VTEC engine. It has 112,000 miles and at an idle, everything seems fine, barely any noise. When you are driving and you put a load on the engine at about 2,800rpm i hear a noise that sounds like rod knock but its real quiet. I drove my friends dads 00' Civic (170,000 miles)and it makes the same noise, they both sound like they have rod knock, but my friends dad's is much louder than mine. Is this type of noise normal for D16's?