Just a point of clarification!

The ridge I was speaking about is in the aluminium housing to support the
steel (wear plate) and acting as a clamp between the rotor housing and the
end housing.

Do you still feel this would cause a problem, or do you

feel the steel has

sufficient strength and should float freely at the edge.
Confused!
George (down under)

George,
 The steel needs to be supported from the outside or captured on the edge. The explosive cladding Paul was looking into would be the best. The problem is checking warpage without running the engine, which could destroy the rotor the housing or both. The plate could be a high strength steel  and then wouldn't expand as much.
Bill Jepson

 
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