X-Mozilla-Keys:                                                                                 

Another way to attack the difference in expansion between the bolts and the
housings is to use necked-down high-strength bolts. I don't know why Mazda
doesn't do this in production. It is commonly done for cylinder head bolts.
The idea is that the bolt section reduction provides sufficient elasticity to
reduce the amount of change in clamping force with deflection of the bolt
caused by housing expansion. The bolt must be strong enough that sufficient
preload can be obtained while leaving adequate margin for handling the
thermal deflection without overstressing the bolt.

BTW, the marine engine business is going well. We have just added a new Sr.
VP of Sales and Marketing and we will be targeting inboard sportfishing
boatbuilders. Surely some of you aviation guys have boats also???

Jon Lauter
Rotary Power Marine Corporation

Funny thing. Early Mazda engines had necked down bolts. I guess it
was too much of a price to pay by Mazda just to add that little bit
of extra over heating margin. I guess if you over heat your engine you
deserve to have to overhaul it. 


Jon, you ought to do a deal with Juergen Bax and sell Wankel based
outboard motors in the US and Canada. That would be a nice synergy
for your business.
 
Paul Lamar
 
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