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Thread: boring 2.2L cast iron T cylinders

  1. #1

    boring 2.2L cast iron T cylinders

    I have a set of 2.2L cast iron T cylinders which have wear lines which catch on the fingernail. Since honing the cylinders alone is not going to restore them to good condition, I am concidering boring out the cylinders because new pistons are in the works for this motor anyway (low compression ratio for turbo).

    Anyone have any experiences with boring out the cast iron cylinders? How far is it safe to bore them? What about sleeving the cylinders?


  2. #2
    I believe both can be done. Contact one of the reputable Porsche machine shops for the max. amounts. However, for best engine longevity with a turbo, I'd start with something with better heat rejection characteristics such as Biral cylinders from an E or S. These are aluminum cylinders with factory cast-in iron sleeves. I think these can also be overbored. The best solution might be new factory, low-compression piston/cylinders, but you're probably aware of the cost.

    Early 911S Registry

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