Does anybody know what sort of wear is tolerated on your cylinders and pistons for a 93mm bore.

93mm is the stock bore for 1800cc Kombi engines... is this what you mean?

100,000 km on a motor at least. The heads will give way long before the rings and/or pistons-cylinders.

Really high mileage engines might see some wear on the cylinder walls, which a hone will probably take out anyway. New rings, and away you go.

Sounds good to me.
Cheers mate.

Check this out Milt all you need to know http://www.1800vw.bizhosting.com/PistonRingCK.htm  :thumb