I have heard rumors that the housing is not a perfect trochoid.

Paul Lamar

That is very likely, probably for the same reason that pistons are not

truly round - preshaped

for unequal thermal expansion. - Vance

Wrathall Mark wrote:

Could Jeff or Jon or someone else who has done R&D on the core engine
please comment on this? Was the minor axis waist shape optimised empirically
to reduce apex seal bounce or wear? I noticed on the Mercedes C111 drawing
that Paul posted a while ago that it didn't have any cooling at all on the
cold side of the rotor housing. The 13b has some small passages (probably to
warm this side and even out expansion. -Mark Wrathall

True on the warming Mark. Mazda attempted to get the housing a uniform
temperature.

Paul Lamar
 
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