John,
Yes, I would be interested in any pictures you could provide of your carburetor set-up.
Air flow through a radiator can be disappointing at times. If, in your photo, the black box at the rear of the engine is the radiator there may not be much air actually flowing through it. If you place your hand behind the radiator with the engine running, do you feel feel much hot air coming through it? I've seen lots of model multicylinder engines with the engine's fan blade behind a front mounted radiator, but without a shroud I'll bet most of the air is being pulled from behind the radiator rather than through it. Jerry Howell's V-4 was the best example I've seen of doing it the right way using a shroud. If you have a way of measuring the coolant temperature it would be interesting and easy to put one of those larger size computer fans right up against the radiator to see if you can measure a temperature drop in the coolant. In a radial, the engine heads are pretty efficient radiators, and prop is right up aginst them, and so that system works pretty well. In enclosed engines like the Merlin, we get little benefit from the prop wash.
By the way, it sounds like you've built several engines. I sure many of us would like to see more pictures of your work, if possible. - Terry
