X-Mozilla-Keys:                                                                                 
Bill Freeman wrote:

JDana2@aol.com wrote:

Bill ... POrsche used an alloy in their studs called "delovar" SP?  which
supposedly had the same expansion rate as the aluminium. It works quite well
in all aluminium porsche engines.   JIM DANA

Yes, but they use aluminum cylinders!  This makes the whole stack aluminum,
rather than just the cyl head.  Also, with their OHC setup, the "head"
(including
cam box assy) is MUCH thicker than the VW head, and the VW cyl is
cast iron.  So, Porsche's situation is much more difficult, and plus they
have a much higher budget to work with.  The rotary is probably more like
the VW since it is a mix of cast iron and aluminum.  I'd rather avoid exotic
alloys if possible. $$$$$!  We'll take a look and see if either a bolt redesign
or possibly belleville washers will solve the problem.  I expect that a special
bolt will solve it, but need some hard info to work with, this is just a guess
at this point.

Bill

 
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