How do I sync SU carbs?
If it falls and the engine tends to die , the mixture is too weak. To correct the mixture, move the jet adjuster nut one hexagon flat at a time. Screwing it up – anti-clockwise as seen from above – makes the mixture weaker. Screwing it down – clockwise makes the mixture richer.
Are SU carbs reliable?
The SU carbs were used an many of the British cars. Roll Royce, Bentley, MG etc, They are very good reliable carbs. They have a dash pot that you have to keep topped up with oil. They come in several different sizes.
What does SU stand for on a carburettor?
S.U. stands for Skinner Union and the first carburettor was made by Herbert Skinner and his brother, Thomas Carl Skinner, (Fig. 3) in 1904, and patented in 1905 (No. 3257/05).
How does choke work on SU carb?
The ‘choke’ mechanism on an SU carburettor usually also incorporates a system for holding the throttle plate slightly open to raise the engine’s idling speed and prevent stalling at low speeds due to the rich mixture. The beauty of the SU lies in its simplicity and lack of multiple jets and ease of adjustment.
What oil do you put in SU carbs?
The first is SU Damper Oil, which is a straight 20 grade and comes in a handy 125ml bottle. This oil is for use where the carburetter is fitted with a damper inside the piston and can be used on all SU, Zenith and CD carburetters.
Are SU carburetors still made?
In 1996, the name and rights were acquired by Burlen Fuel Systems Limited of Salisbury, which incorporated an entirely new company with the name The S.U. Carburetter Company Limited, which continues to manufacture carburettors, pumps and components, mainly for the classic car market.
What oil goes in a SU carb?
20W fully synthetic engine oil – not to be confused with 20W50 engine oil of any sort. Just a ‘straight weight’ oil. I use this on practically anything where any modifications at all change the spec away from original.
What is the overrun limiting valve for in the SU carburettor?
The valve opens under high manifold depression conditions, i.e. overrun at closed throttle, reducing the depression and supplying a quantity of correct fuel/air mixture through the throttle disc.