Hi all, A few of us at Omaka think this machine was the most photographed on the field, but that didn't stop me from taking some iPhone snaps for future reference. Please find below a short walkaround of the recently-restored Griffon Spit.
Ancillary drives like the supercharger two speed clutches etc, must all have external lines feeding the remote bearings etc. I might be wrong... otherwise the oil return lines must be external as well? Vibration is a killer for external lines, unions and copper washer joints.
If I remember correctly,the 37L Griffon would have been quite a bit longer than the 27L Merlin had it not been for the relocation of certain ancillary drives like the distributors etc, it being quite a bit different in final design, having a different heritage than the Merlin as well - the Griffon came from the RR Buzzard engine of 1927, which then became the RR-"R" engine for racing (6" x 6.6" Br x St). The Merlin grew out of the 21L Kestrel as an oversize design by increasing bore from 5" to 5.4" and stroke from 5.5" to 6".
The other thing they did with the Merlin through design and versions, was to shift the external oil lines around the block and cylinders of the Kestrel to internal drillings for pressurised oil galleries. Eliminating some of the external oil leaks and engine failures.