| I'm in the middle of tearing down the motor to replace turbos with Sport 500's, MSP Manifolds, and Ash Planar intake. Also adding '95 CAMS and VTC etc, converting to OBDI with a new OEM harness. Installing Nismo 740CC's and eventually Ash Spec piping/intercoolers. (A/C compressor just went out in my DD VW TDI). Borrowed my mechanic friends SnapOn scope just to play around with it and found this inside the cylinders. Worst was probably #6. I've had an exhaust manifold leak for a long time that would close up as it got hot, but come to find I had one on the other side as well due to a broken stud. During the process found one of the accordion hoses had a hole in it at the clamp, although I had good boost leak tests. Compression was checked and all in the ball park of 165 psi. Motor runs strong. Stock boost and have checked with an external boost gauge. The only time I've heard major detonation was when I first installed a JWT pop charger and timed it incorrectly ('96 are a bit different procedure come to find). Only for a test drive. I do some track stuff and have a stock PCV system that I've seen smoke on hard turns. 146K on motor, was stock when I bought it. I pulled #6 rod bearing to check and only saw very minor wear, so had decided to leave the bottom end together. Recent UOA showed high silicon (dirt), but very good wear. Recently switched to Apexi filters. When I originally bought the car, the throttle body hoses were deteriorated and likely letting in are, but I fixed them immediately. Hadn't budgeted or planned on a block, but not sure what to do now? Possibly had minor detonation this entire time from the oil, or lean condition. the spark plugs have white on the tips and you can see the valve in one of the cylinder on the driver side. Pics basically go #6, 4, 2, 5,3,1 but passenger side looked pretty good. If needed I can post a pic of the bearing, just have to pull it again. Could run the scope up from the bottom as well then. Not sure what that yellow thing is, notice what seems like pits or scarring.
 Close up
Top of one of the cylinders
 
Valve
 Different cylinder
 Valve stem
UOA
Here's what the plugs looked like a while back. Cleaned them off and now just the metal hoop has the white on it.
1996 TT #61 of 300 |
Borescope pics need advice on what to do now? Detonation ? - 
