HIF4 carbs (AUD 616) as fitted to early rubber bumper MGBs

Parts for AUD 616 for MG M.G.B 1798 cc – SU Carburetters – SU Carburetters

This is the carb that has an incorporated distributor vac port – on later carbs this vac port removed and moved to the inlet manifold.

This change was an emissions mod that advanced the timing on tickover reducing emissions. But unfortunately when the timing is advanced further to suit modern fuels it can make it a bit lumpy and more likely to misfire a little at tick over. This does not happen with these carbs as there is no vac advance at tick over.

Modifiers of tuned engines often prefer these carbs as it makes a better take up when the engine revs up from tickover.





Dismantling and inspection:-