QUOTE (Feliks @ Oct 24 2010, 04:33)

It should be approached with great reverence for history...

http://www.youtube.com/watch?v=D6Zw1_NiSWghttp://www.youtube.com/watch?v=EJcxpFTFJPA&NR=1At this film see why Crecy was in the half of the road. Simply moving the heat from the cylinder is very difficult way to get to the fins ...
But my engine, as befits the end of the road ,a little better light, even though this is only the second prototype.

Regards Andrew

The pictures and videos you posted were of the Bristol Hercules, which was quite a reliable engine. It was a 14 cylinder 2 row air-cooled radial with sleeve valves. To my knowledge they didn't suffer cooling problems different to any other air cooled engine.
The Rolls Royce Crecy was a V12 liquid-cooled 2 stroke with sleeve valves. As such it had no cooling fins. The sleeve valves worked slightly differently than on the Hercules, Taurus and Centaurus, Napier Sabre and Rolls Royce Eagle 22 in that the intake was through a jacket at the base of the cylinder, with 360° of porting in the sleeve and cylinder. The exhaust exited over the top lip of the sleeve and out the side of the top of the cylinder. The arrangement caused extremely loud exhaust noise, and could be heard for many miles around when the engine was run on the bench. It also meant that there was significantly high exhaust thrust.
The Crecy had many development problems, but was low on the priority list at Rolls Royce, which had the Merlin, Vulture (until 1944) and Griffon to concentrate on. RR were also running a 24 cylinder air cooled sleeve valve engine from about 1939 (the Exe, about 21 litres capacity), and developing the Eagle 22, similar in concept to the Sabre but 46l/2800cid instead of 37l/2200cid, and the Pennine - a larger version of the Exe (also 46l/2800cid). Not to mention their jet engine projects.
The Crecy did indeed have piston cooling problems, and had the tendency to burn hole sin the pistons. Many WW2 aero engines had oil cooling for the undersides of pistons, and the Crecy was no exception. Rolls Royce systems, like most I would guess, had fixed nozzles in teh crankcase directing oil to the underside of the piston. The Crecy had an arrangement where the oil was pumped through a tube in the middle of the con-rod and into the piston, where it was distributed for cooling (pistons were 2 piece). Had they continued the engine, Rools Royce would have used the fixed oil spray nozzles, and used a lot more oil for cooling. But by then the jet engine had arrived.
I'm not sure how the Hercules or Crecy are related to your engine, as the valving arrangement is completely different.