The GB Deezil replica shown above has been run.
Fits are excellent. Silky piston/liner. The bottom end incredibly smooth and free, yet no oil weeps from the front of the bearing. Contra-piston fit is perfect. Gas tight, but jumps up readily when running if compression is wound back. When turned over slowly with a propeller fitted, the piston falls to BDC under its own weight. It feels extremely free but I doubt this one has a roller bearing, which some of the GB Deezil replica's were reputed to feature.
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It starts first or second flick after one choked turn; very like a good Mills 1.3. Every time. Even if under compressed. Manners are impeccable.
Props selected and shown below are a Kavan "FK" blue nylon 10 x 4; and an ancient Berkeley (?) "Air-O-Stunt" 10 x 4 'paddle prop'.
The Kavan was turned at about 6,300 RPM. A couple of hundred lower for the Air-O-Stunt.
In summary this is a first class "olde time" 2 c.c. side port. One can only wonder if the owners of GHC really knew what they had with the design.
Last edited by fiery; 10-06-2014 at 11:38 PM.