Quote:
Originally Posted by elmariachi
The rebuilder told me that the crank when he removed and rebalanced, it was 1.3kgs off. I dont know what that means. I had totally no problems for 6-8 months, even after track days. It only happened at the third track day where I had a misfire on Bank 6 at a high rpm and after that, everything ran funny even after replacing all the spark plugs. Ever since, I had severe oil consumption warnings on the idrive every 2-3 weeks even after filling it to a full level as shown on the idrive.
I would say we have pretty good fuel here in Singapore and I dont think its anything to do with the fuel. Possible but highly unlikely.
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Thanks for the reply.
As suspected, the issue you are experiencing is most likely due to a poorly balanced motor. Harmonic vibration will wreak havoc on the motor and it will do it incrementally depending on how bad the balance is.
Misfires combined with a imbalanced motor will amplify the effect as the motor is already off balance and repeated misfiring will effect the way the motor runs.
Did your engine machinist or mechanic by any chance mic the tolerances of the motor to see how tight or loose it was assembled? Overly tight motors will tend to bind up easier and wear out excessively. This is indicative of your crank bearings.
Bottom line is, you made a good move to have the motor rebuilt with new parts. But just please make sure whoever is doing the re-assembly does it in a controlled dust minimal and contaminant free environment. Engine assembly is a crucial process, especially on high strung, high power motors.