SU Carburetor Revision

SU carburetors are common in Jaguars prior to 1985, especially in models with 6-cylinder inline engines such as the XK120, XK140, XK150, E-Type, and early XJ6 models. Here is some information about SU carburetors and their use in Jaguars:

SU Carburetors

SU carburetors are a type of carburetor known for their simple design, reliability, and smooth performance. They were widely used in British cars, including Jaguar, MG, Austin-Healey, and others. The name “SU” comes from the founders George Herbert Skinner and Thomas Carlisle.


The operation of SU carburetors is based on the principle of variable venturi. This means that the diameter of the air intake varies depending on the air pressure in the carburetor. At low engine speeds and low loads, the airflow is restricted by a valve that narrows the venturi. This provides a better air-fuel ratio for efficient combustion.

At Bram’s Classic Cars, we offer SU carburetor tuning services. As a proud owner of a classic Jaguar with an SU carburetor, you understand the importance of a smoothly running engine and optimal performance.


  1. Thorough Inspection: We begin with a comprehensive inspection of your SU carburetor to identify any wear, contamination, corrosion, or other issues.
  2. Disassembly and Cleaning: The carburetor is carefully disassembled, and each part is thoroughly cleaned to remove dirt, deposits, and blockages. We have various techniques to restore the carburetors to like-new condition, including Ultrasonic cleaning, bead-blasting, vibratory tumbler, and polishing.
  3. Replacement of Worn Parts: Worn or damaged parts are replaced with high-quality original SU parts.
  4. Adjustment and Lubrication: After the tuning, the carburetor is precisely adjusted according to the manufacturer’s specifications.

If you’re experiencing issues with your Jaguar’s SU carburetor or simply want to ensure it’s performing at its best, trust Bram’s Classic Cars for expert tuning and restoration services.