Ever since I bought the Phase 3.5 Cav Turbo from John Timkeys its always had an intermittent problem, which I thought I'd cured, but alas, it continues.
After a period of driving (and it doesn't have to be hard driving either), the engine will become very noisey, tapping away. It periodically stays for a while, then drifts away, and later on it will come back again.
Now I thought perhaps the engine was running too hot, so I fitted a lower opening temp thermostat and have switchable fan capability to keep the engine cool.
The only thing that makes any sense right now is a weak oil pump. Any ideas?
when john had it he had this problem too, we tried everything, was same symptoms as you have now, was nice and quiet then it would tapp far a bit with lots of blue smoke the die away as quick as it started, so wee took the head of and found that 3 of the stem seals had perished, replaced tham and it was fine.