Paul,
          When I dismantled the engine, all of the exhaust ports were
solid carbon at the initial pointy end of the opening for at least a 1/4
inch to 3/8 of an inch. It was so solid that initially I believed it was
just part of the exhaust.  Is there any way of stopping a repeat of this??
Should I grind this opening a little deeper of just forget what I saw??
I believe the motor had 20,000 KM on it when removed from the car.
    Neil. In NSW Australia

Please take some good pictures of that and send them to us first.
I have heard of that happening with engines that have been babied.
AKA never driven using full power.
Is it a four port or six intake port RX8 engine?

Paul Lamar



Paul,
           Too late for pictures, all cleaned up.  I suspect you are right
about it having being babied as the rotors had what I believe excessive
carbon on them.   It is a 4 port intake on an automatic.  The motor is ready
to be reassembled, so all clean at the moment.     Neil.