They told us and I did not write it down. Mark Wrathal wrote it down I

think. Mark?

It is flame sprayed something or other. Not Nicosil. The rotor housing

is Nicosil.

It is quite thick as there is a slight recess machined in the end

housing to accept

the coating. If it were me I would just put hardened and
ground sheet steel in there.

Paul Lamar

Paul, with the small area near the pinch of the trochoid
you would probably have trouble keeping sheet steel flat.
The coating if successful, would be easier to do. Fewer machining ops.
I haven't given up on a source for coatings.
Bill Jepson

I think you could stud weld on some screws and bolt it on. I think it

would be

a lot more durable than coatings. Either that or cast it in like Mazda

does on

the rotor housings. One could also press in special serrated flat head

steel pins

in undersize holes in the aluminum casting. Then grind it smooth.

Paul Lamar

Bill and Paul,
I've been talking to my machinists mates and I believe a cast steel plate
with stiffening ribs and stand-offs, bolted from  the outside of the
aluminium housing might work. The cast plate edge to sit on a machined edge
of the aluminium.
We are about to have a look at that.
George (down under)

 
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