The reasons for the few blown 1.8T's are various. If on stock bottom end, the first thing to blow is the rods, and they usually scrap the whole motor and put a window in the block. They blow just from being overpowered, nothing more. Blown built motors are usually due to either a shop not machining or assembling a block correctly or faulty parts. I spun a rod bearing a few months ago and trashed the crank and rod on cyl #3, that was due to a faulty bearing and loss of pressure to the oil pump. This was almost 8 months and 10k miles after I had built it originally. A few of the other big 1.8T failures were due to boring a block without a proper torque plate, some cam issues which caused a motor to go way out of time, and various other install/part issues. As I said the closer to OEM you can keep the motor, of course if it fits the bill for your power level, the better off you are. No one on Earth can build a motor to the spec that OEM motors are built from the factory!
Why would someone go all out .. because they want to. We tend to do alot of things that arent needed with these cars
Drop in rods are a affordable and quick solution, this strengthens only the bottom though (duh
). If one wants to rev higher then obviously attention to the head is needed. Reagrding the bottom end on any 1.8T that came with 20mm wrist pin forged pistons (AEB and AMU) or the 2.0T FSI which also has both, the most important part after replacing the rods is balancing of the crank, rods, pistons, clutch and flywheel. If all of those are in balance, the result will be the least amount of wear on bearings and rings and ultimately the strongest motor! Honestly from the bottom of my heart (and I own my own shop dont forget, I can make money off selling pistons as well), they are not needed for the power levels a 30 series turbo is going to provide and especially on software tuned cars where all safety measures are still intact (knock sensors, timing retard, ECU fuel enrich, ...)
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