OK. I took apart my bottom end. I expected to see chunks of metal stuck to the oil pump pickup screen....but it was clean. I removed the rods, piston, and crankshaft. The bearings were worn evenly, still good. Crank is still in spec and round. The piston skirts were badly scored. I'm still somewhat inexperienced with troubleshooting these things, so I figured I would ask the wise folk on SM.
Ok...history.
The knocking noise was dependent on RPM...higher rpm, faster knock. It was present at all engine speeds....idle, 2500, 3500, 4500, 5500, it did not go away. It was not anywhere near as loud as the rod knock I had bought the car with 2 years ago.
Ok things that might somehow be related:
I swapped out a blown r154 2000 miles prior to the knock.
The vehicle had a stock turbo, exhaust, ferrea oversized valvetrain, shimless buckets, ported manifolds, egr removed, lex afm, nippon denso 550's, walbro 255 pump, safc2. timing was at 12*, AFR was at a steady 11.5:1 under wot, little rich at idle. don't know if there were any codes...it's a parts car now for my new project and I tore it apart before I thought to check the codes. :cry:
I wont be using anything other than the crank from this motor, but I am very curious as to what made the knock....I have a feeling it's got a lot to do with the piston skirts being scored up.
Off topic question in my own thread....What is the size/pitch of where the transmission lines attach to the trans? Toyota couldn't get us the lines, so my dad's car will need braided lines and a big ass cooler.
Ok...history.
The knocking noise was dependent on RPM...higher rpm, faster knock. It was present at all engine speeds....idle, 2500, 3500, 4500, 5500, it did not go away. It was not anywhere near as loud as the rod knock I had bought the car with 2 years ago.
Ok things that might somehow be related:
I swapped out a blown r154 2000 miles prior to the knock.
The vehicle had a stock turbo, exhaust, ferrea oversized valvetrain, shimless buckets, ported manifolds, egr removed, lex afm, nippon denso 550's, walbro 255 pump, safc2. timing was at 12*, AFR was at a steady 11.5:1 under wot, little rich at idle. don't know if there were any codes...it's a parts car now for my new project and I tore it apart before I thought to check the codes. :cry:
I wont be using anything other than the crank from this motor, but I am very curious as to what made the knock....I have a feeling it's got a lot to do with the piston skirts being scored up.
Off topic question in my own thread....What is the size/pitch of where the transmission lines attach to the trans? Toyota couldn't get us the lines, so my dad's car will need braided lines and a big ass cooler.
