"Robinson, Chad" wrote:

The housings have a polished surface of course, no hatching
to break into. The standard piston builders are using finer
and finer hones now using 600 or finer hones for finish! The
cylinder looks polished. The rotary probably fares best
with ultra-hard fine finished surfaces. The LeMans engines
det. gun coatings are very hard. Bill Jepson

Is there a reason not to polish to higher grits (other than work involved)? 
Suppose for instance that one had access to polishing equipment designed for
 machine tools and could polish to 1200 or even up to 3000 (!) grit? Overkill, 
I'm sure, but hypothetically... Could it negatively affect other factors, such 
as heat absorption rates (since the surface is now more mirror-like)?

Regards,
Chad

The rotor housing is chromed and mirror like. You want to retain
the combustion heat for efficiency reasons.

Paul Lamar

 
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