19-05-2022, 09:56 PM
The original GE Brooklands manifold was of 'torpedo' style with the exhaust pipe attached by a large brass nut of a type used in period for central heating pipework, presumably a BSP fitting. I doubt if any original manifold has survived so any dimensions you are given could be misleading. I would start by getting the exhaust pipe diameter and obtaining suitable BSP fittings. The length of the 'torpedo' could be scaled quite accurately from period photos, especially as any photo will also show a 19" diameter wheel. The pipes from the ports to the torpedo are probably parallel rather than tapered, whether there were originally three or four I don't know but would guess three like the Ulster exhaust with a shared pipe for cylinders 2 and 3.
The owner of 'Slippery Anne' may be able to help?
The owner of 'Slippery Anne' may be able to help?