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have a feeling this might be bad , my rb5 has developed a knocking sounds as if its coming from the back of the engine (if stood infront of car) ans slightly to the left , have a feeling its no3 cylinder cracked does this sound right
Does the engine smoke at all or suffering a drop in oil pressure ??
If you gently bring the revs up to 2500rpm and release the throttle, you will hear a failed big end bearing as the revs fall.
Hopefully its not the big ends in your case.