I have an R33 GTR and just rebuilt the motor with replacement polished crankshaft, new bearings, forged rods and pistons, new water and oil pumps, crankshaft balancer, ported head and HKS GTSS turbos, APEXI Power FC and 90mm exhaust, Apexi boost controller etc etc.
420 BHP at all 4 wheels at 14 psi but the engine makes a tapping sound which gets louder when it warms up. It sounds similar to a spun bearing and is loudest near the bellhousing.
Its driving me and my (excellent) GTR-experienced mechanic nuts. All valve clearances are on spec. and it runs beautifully.
I would be very grateful for any suggestions!!!!!!!!!!!!!
