Hey, I just bought a 91 turbo supra a few days ago. The guy said it had 2k miles on a rebuilt motor. Two days after I bought it I started hearing a knocking sound coming from the engine. It would do it around 2-3000 rpms. It started off quiet but it got worse and worse. Now it knocks really loud even at idle. We first thought it was a piston but the compression seems to be okay. Then we thought it was a rod but i checked the oil filter and found no metal shavings or anything. The noise sounds like its coming from the head. Does anyone know what could be wrong? Thanks
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