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have tracked down some 660 and also some cast iron . big decision ?

Thanks for the imfo . I am trying to track down some mehanite or decent cast iron . not so easy to get a short end.

I am building a 1 1/2 inch scale Minnie Traction Engine. My question is, what would be the best materials to use for the cylinder liner and piston? My thoughts were cold-rolled steel for the liner and aluminum for the piston. I could use 660 bronze and stainless for the piston. What are your...

You're going to be very lucky in getting it out with all these suggestions. I would take it to a shop that has an E.D.M. -- and hopefully they will be sympathetic and do it for free. It's the only way of getting it out without making a mess, and ruining your crankcase and doing more damage...