christopher storey said:They are of a totally different type, with those on the E type having a shoe ( attached to the jet mechanism ) at the base of the carb which operates a brass rod of substantial diameter which goes vertically through the cast body of the carb, and then has a "tappet" on the top which operates the fast idle lever
here is a picture of the underside of E 4.2 carburetters
christopher storey said:Tom ( and Vern )
having looked in my SU catalogue, HD8 were listed ONLY for 1966, and after that all twin carburetter cars had HS8, so your chances of finding HD are rather limited. In any event, the E type and mark X carbs do indeed have the separate idle circuit referred to by Vern . It is the big screw about 1/4 inch diameter on the top of the body . The effect of this is that the butterflies have to be completely shut at idle , and the air is admitted purely through the bleed circuits governed by the screws . If the Rovers HD8s do not have this then I think it would impossible to use the carbs as a whole ( although it might be possible to canibalise them for the brass rods, shoes etc )
TimBC said:My spare TC engine number is 4151****B, would that indicate an earlier model with HD8 carbs on it? I'm not convinced it really matters all that much, but it's something I'd like to know if I ever wanted to sell them!
christopher storey said:No fuel return line on UK and Euro HS cars, nor are there any on HD8s used on E types