Miata Mailing List: August 1994, Message #164
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   From: mikef@mer-mail.ctron.com (Michael Friedman)
Subject: Re: Care and Feeding of my new baby (fwd)
   Date: Fri, 5 Aug 1994 11:14:11 -0400

 > From: Jeff Maurer 
 > I've also heard that running at steady rpm's during break-in can increase
 > the chance of developing a ridge on the cylinder wall at the top of the
 > piston stroke.  This increases wear on the rings when higher rpm's force
 > the piston higher in the cylinder.

Say what!  RPM doesn't effect the travel distance of the piston.  That
distance is fixed by the diameter of the crankshaft.  If your piston
is moving a greater distance at high rpm, if could only be from the 
crankshaft bending outward from centrifucal (sp?) force, not likwly
on a 5 main bearing engine.

Mike