red95_240sx
02-08-2008, 07:05 PM
My engine has been making a rev-matching sound that sounds like a creak/croaking sound. Around 4k, the engine swallows the noise up. Its slower than the engine speed, im not sure how fast one cylinder moves, but ive calculated engine speed to be around 10 rotations a second at idle. Its also slower than anything belt driven. its about a half second apart at idle. doesnt happen while the engine is cold. The noise is coming from the right side of the engine near the belt area.(boom06)