21-05-2018, 11:34 AM
There are two 1" SU types commonly available, the OM, which has a round air intake and no intake flange and the UBA, which has an intake flange suitable for an air filter. UBA's have a vertical mounting arrangement, so need an adapter to mount onto an A7 manifold. They were standard on late Morris Minor and early Morris 8 models but may have been fitted to other, less common vehicles.
OM's are more variable and some have a horizontal mounting and bolt directly onto an A7 manifold.
Fitting an SU to an early car is a bit of a challenge, requiring a special inlet manifold. I have a UBA on my mag engine Chummy, using a manifold fabricated from 28mm plumbing fittings! It just about allows the SU to fit in and close the bonnet. However, I have obtained a Derrington aluminium manifold, which gains about an inch over my creation. Sadly, it is cracked and probably only suitable as a pattern. I may see about getting some reproductions cast.........
OM's are more variable and some have a horizontal mounting and bolt directly onto an A7 manifold.
Fitting an SU to an early car is a bit of a challenge, requiring a special inlet manifold. I have a UBA on my mag engine Chummy, using a manifold fabricated from 28mm plumbing fittings! It just about allows the SU to fit in and close the bonnet. However, I have obtained a Derrington aluminium manifold, which gains about an inch over my creation. Sadly, it is cracked and probably only suitable as a pattern. I may see about getting some reproductions cast.........