Weber Carburetors TYPE 26 IMB1 & 26 IMB3
by Miller | June 7, 2009 | In Engine | No Comments
The following Weber carburetor types have been fitted:
- New 500 ——————— 26 IMB 1
- 500 Sport ——————– 26 IMB 3
- 500D————————– 26 IMB 4
- Station Wagon ————- 26 OC
- 500F ————————– 26 IMB 6
- 500L ————————– 26 IMB 10 (incorporates CO limiter for idling)
The weber 26 IMBl carburetor is a downdraft, single body carburetor with 1.0236” (26 mm) diameter throat at the height of throttle shaft.
The fuel mixture rating system consists of a throttle valve controlled by accelerator pedal through a cable which operates a lever secured to throttle valve shaft. This carburetor is fitted with a progressive-action starting device which enables the driver to suit the mixture richness to the most varied conditions of starting, until the engine has reached the rated operation temperature.
The dampened needle valve ensures a smooth engine running since, thanks to its dampening device, it is not affected by vibrations and, therefore, keeps steadily constant the level in carburetor bowl.
Operation.
Diagrammatic section of Weber 26 IMB1 carburetor
1. air corrector jet 2. air inlet 3. idle speed mixture duct 4. idle speed jet holder 5. idle speed air orifice 6. filter cover 7. Filter 8. fuel inlet connection 9. needle valve seat 10. Needle 11. float pivot 12. Float 13. idle speed jet 14. main jet holder 15. main jet 16. Bowl 17. idle speed mixture adjustment screw 18. idle speed mixture orifice 19. Throttle 20. transition hole 21. primary Venturi (not interchangeable) 22. emulsion orifices 23. emulsion well 24. secondary Venturi (not interchangeable) 25. main nozzle
Referring to the diagram. the air from above, [More]
