emcon5

I have a set of Mahle 98mm Pistons and cylinders that I need some help with. I need new pistons, as these are lower compression than I want, and I need some help with the sizing. The cylinders all have a "0" mark at the base, seen here:
<img src="http://members.rennlist.com/emcon5/mahle_cyl.jpg" alt=" - " />

and the pistons all have a "1" stamped on the crown, seen here:
<img src="http://members.rennlist.com/emcon5/mahle_moritz.jpg" alt=" - " />

I assume this means that the pistons are size "1" and the cylinders are size "0", and I therefore need either size "0" or "1" pistons. Is this correct?

The cylinders have all been checked out my my machinist and are in excellent condition, with only ~15K miles.

On a related note, what would a 15K mile set of Max Moritz 98mm pistons be worth? According to Bruce Anderson's book, they started out as 9.3:1, but the previous owner had deeper valve pockets cut, so the compression is slightly lower. With wrist pins, but not rings or cylinders.

Thanks,

Tom Aiken

KLehmann

I just read about this in Wayne's 911 rebuild book Tom, but darned if I can remember if the number is size or weight group. Either way, yes, they have to be matched.