I wish I could recall exactly where I found this info, apparently
these mods are what Mazda did for high performance engines.. Notice
they actually separated the tension rod housings/holes from the
housing surface and thinned everything in that area.


Dan Gorsline

This is a severe test. In my 40 years experience with Mazda rotaries
 I have never seen any of this cracking or black coatings this bad. I
have seen the steel liner melted through when run without coolant
until the engine  stopped. Steel melts around 2000 F as I recall.

BTW The ceramic apex seals survived to be used in another engine.

This includes turbo 2 rotor  650 HP drag racing engines.

Obviously they were using organic oil that breaks down around 250 F
rather than synthetic or two cycle oil.

Paul Lamar

=========================================================

On rereading this I realized this was not a Mazda production engine.
The chrome plating was applied directly to an aluminium rotor
housings. All Mazda production rotor housing have cast in steel
liners. Perhaps this was a Mazda custom racing housing.

Also I might add shocking the rotor housing with cold water after a
sustained high  RPM, high power period is close to imposable to do
with a real world cooling system and installation. Two sources of
cooling water must be available. One heated by the running process
and another cold coolant supply. Perhaps this is possible in a boat
installation.

Paul Lamar


I remember having read, but don't remember where, that cracks in
the working housing were eliminated also by screwing the plug in
an independent part who was screwed to the housing, in the
Citroen Ami car I own, in an occasion when the engine
(2-cylinder, air cooled, 602 cc) ejected a plug, I had a local
machining shop drilling a larger screwed hole to which another
screwed part was plugged, and then plug screwed in a hole of the
same size as the original plug hole in the engine head for
  around $100, a not too expansive repair for a severe problem.
    Best regards. Salut ?
        Jose Gros-Aymerich
         Madrid, Spain



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