On Fri, 16 Mar 2012 01:20:44 -0500, Tim Wescott
wrote:

On Thu, 15 Mar 2012 23:52:55 -0400, Ed Huntress wrote:

On Fri, 16 Mar 2012 10:41:45 +0700, John B.
wrote:

On Thu, 15 Mar 2012 13:43:35 -0500, Tim Wescott
wrote:

http://en.wikipedia.org/wiki/Schnuerle_porting


Set up a fixture to hold the cylinder liner at the angle you want the
port. Drill a hole to the largest diameter that fits your square port
and file to final shape.

If you are persnickety then leave the sleeve bore a few tenths underside
and lap of hone to final diameter after finish filing the ports.

I'm thinking that he will have a file stroke length of around 6/10 of an
inch...

I've had to deal with similar filing jobs before. And a few gouges along
the diameter of the cylinder wouldn't be all that bad if they were in the
plane of the ports, anyway, and happened before lapping. (And lapping
has to happen no matter what: that's how you achieve the cylinder-piston
fit).

You're a patient man, Tim.

--
Ed Huntress