No, never have I heard of that. I, too, would be worried about stack height.
The extra force from the additional spring shouldn't harm anything too much,
but if the stack goes "solid", then there could be extremely high forces on
the seals. Was the extra spring in place beneath all the seals?

Jon

Absolutely every one. I was dumbfounded and starting to check all the
shop manuals to see if Mazda changed to three springs in later engines.
Sounds like someone is second guessing Mazda engineering. Do you
think it changed the chatter natural frequency?

BTW Jon I am curious about something. Would a 3 mm wide one piece
apex seal have a different chatter frequency due to its increased mass as
compared to a three piece 2 mm seal? If so do you think it would be worth
while to reduce the mass of the one piece 3 mm seal by drilling a bunch
of small holes in from the back side?

Paul Lamar
 
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