I got a few here that i never bothered to post up and one i only found out last week.
S13 Silvia, S1 RB25DET
mods: exhaust, ecu, pod, boost.
1. Well to start with the engine came out of a car that had been in a front on accident and therefore had a radiator rapped around the block. A weak part of the RB motors is where the waterpump protrudes from the block (the thermostat is behind). This caused a split (read: completely in half) of the water pump gallery. It had been welded up (albeit bronze welded) and then has cracked next to it. The Water Still Beads!!!
2. Excessive oil consumption. Oil used Fuchs mineral based 5w/40. Car has been off the road for 16 months saving for the rebuild. Problem not know until stripped head down last week. Result: #2 & #3 exhaust valves were not seating properly and not sealing, #4 had a carbon buildup and sludge all around the exhaust valve seats and had completely killed the seat.
Fix: Full rebuild with new bottom end. I purchased a bottom end already build with Forgies and heaps of stuff, had the head rebuilt and screwed together with a metal headgasket.
Cost? $5000 and still escalading. Suspect turbo will be next to go.