Hello Larry,
That is interesting, the last one I saw was a glow and it was very wet around the nose when it was running. Looking very carefully, the fuel wasn't coming out of the crankshaft nose, but blowing out of the venturi! The engine was overpropped and wasn't making sufficient rpm for the timing. A smaller prop cured this and the "wet nose " went away.
I shall try the diesel version (I am a diesel freak), this may be a bit more stunt friendly.
Regards,
Andrew.