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Message: <blockquote data-quote="ess530i" data-source="post: 361687" data-attributes="member: 13496">i am really curious too... this is the first time ever we've heard of it. fortunately the cam is not damaged or at least it doesn't appear so. few possibilities in my opinion:1. the boys over tightened the bolt (he said did not use torque wrench but boss said got use)2. previous use of lightweight crank pulley caused the metal to be weak (unlikely)back to the blown pistons, could bad fuel quality be the root cause? there is this station near my area where i feel that the fuel doesn't give optimum power at times. could be psychological coz i am really hoping dat its as simple as bad fuel quality... any of you had engine probs due to this reason b4?anyway i have pretty much decided on proceeding with options 2. should i go for standard 84mm or oversized 84.5mm pistons? the cylinder walls appear good visually. not sure if i can trust the local machine shop to bore my cylinders. Its BMW Germany vs some backyard Msia machine shop...</blockquote>