Quote:
Originally Posted by tkddave951
Sorry for the confusion, you are correct the block is new to me only and is not a zero mile new block. As stated at this point I am only assuming that the pistons and block are still in spec.
Obviously if the cylinder bores or piston skirts are worn then the gap is going to increase.
I guess what I am trying to figure out is why everyone says that you must use the same tolerance group pistons and bores when according to Porsche's own service manual there is more than enough tolerance to mix tolerance groups.
Just in case though if anyone has a set of tolerance group 2 turbo pistons I would be interested if the price is right.
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I'm sorry but I don't follow, I thought the piston-wall clearance was equal to the cylinder diameter - the piston diameter, which in this case is 0.040mm, which is out of spec right away. I don't recall them dividing by 2 to take into account each side separately.
Always have the bores checked before you make any plans for the block, how they look means absolutely nothing, if cheap conventional oils were used all the scratches will wear away
