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The HS series SU Carbs

HS SU Carbs were fitted to a wide range of vehicles. They are easily identified by the float bowl being attached to the main body with a sideways bolt, and the jet has a small flexible pipe to the float bowl.

The float bowl is the same size across all of the HS carbs, but the bellhousing size and bore diameter is different. They may have a fixed needle arrangement like the H series carbs, but later ones have the sprung needle.

Most HS carbs are easy to find, except for the HS8 which are less common.

HS Series SU Carburettors

HS2 HS4 HS4C HS6 HS8

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If you have any photos or other information on SU Carburettors, I would love to hear from you. please send me a message: tim@carb.su

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The HIF SU Carb

The HIF carb replaced previous types and was a significant evolution of the SU Carburettor design. The float bowl was absorbed into the base of the main body casting, the piston slides on a ball bearing type mechanism, and the layout of the various adjustment screws was completely revised.

The HIF also changed the way that the choke worked, the jet stayed in position, and an extra fuel orifice was opened by rotating a small brass valve. Later the HIF carb got an electronically controlled choke lever, see ORFCO

The smallest HIF carb was the HIF4 (later the metric version HIF38) at 1 1/2". The most commonly found is the HIF6, or later HIF44.

The HIF7 was the largest version, and quite hard to find.

HIF SU Carbs

HIF4 / HIF38 HIF6 / HIF44 HIF7 ORFCO

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If you have any photos or other information on SU Carburettors, I would love to hear from you. please send me a message: tim@carb.su

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The 1 3/4" HD6 SU Carb

The HD6 is a HD series carb

Photos of HD6 SU Carb

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If you have any photos or other information on SU Carburettors, I would love to hear from you. please send me a message: tim@carb.su

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The 1 1/2" HD4 SU Carb

The HD4 is the smallest of the HD series carb, which can be identified by the float bowl having 4 small cheesehead screws attaching it to the main body. They were fitted to more premium classic cars, they had cork seals (later rubber ones) on the throttle spindle to reduce airleaks and give a smoother idle.

Identification: The HD4 has a 1 1/2" bore, front flange with two horizontal threaded holes the same as the HS carbs. They always have the full square mounting flange with 4 bolt holes. The jet mechanism is completely enclosed inside the carburetor body.

Most HD carb setups have a solenoid operated AEC (Auxiliary Enrichment Carburettor) which is effectively a very small carburetor that provides a very rich mixture. See here for more information.

Unlike HS style carbs, the HD carbs can have the float bowl mounted on either side of the main body.

Photos of HD4 SU Carb

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If you have any photos or other information on SU Carburettors, I would love to hear from you. please send me a message: tim@carb.su

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The HD series SU Carb

The HD series SU carb are usually found in pairs, and were fitted to more premium vehicles. They had cork seals (later rubber ones) on the throttle spindle to reduce airleaks and give a smoother idle.

They always have the full square mounting flange with 4 bolt holes. The jet mechanism is completely enclosed inside the carburetor body. Usually the float bowl is fitted with an overflow pipe.

Many HD carb setups have a solenoid operated AEC (Auxiliary Enrichment Carburettor) which is effectively a very small carburetor that provides a very rich mixture.

Like H series carbs, HD carbs can have the float bowl mounted on either side of the main body. The float bowl is attached to the main body via 4 small cheeshead screws.

The HD appears to have coexisted with the HS style until the introduction of the HIF type.

HD SU Carbs

HD4 HD6 AEC

More Information

If you have any photos or other information on SU Carburettors, I would love to hear from you. please send me a message: tim@carb.su

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Carb.SU: All you need to know about SU Carbs