Engine Maintenance and Modification Bradley Artigue

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FIAT 124 Spider Engine Maintenance + Modification Table 1: Engine Identification Table Model Year Series From S/N Engine Displacement 1967 – 1969 124AS 5619 124AC.040 1438cc 1970 – 1971 124BS 21861 124AC.040 1438cc 1971 - 1972 124BS1 33950 125BC.040 1608cc 1973 124CS 59592 125BC.040 1608cc 1973 124CS 63308 132AC.040.3 1592cc 1974 124CS1 71650 132A1.040.4 1756cc 1975 124CS1 88792 132A1.040.5 1756cc 1975 124CS1 132A1.031.5 1756cc 1976 124CS1 99909 132A1.040.5 1756cc 1976 124CS1 132A1.031.5 1756cc 1977 124CS1 113343 132A1.040.5 1756cc 1978 124CS1 132A1.031.5 1756cc 1978 124CS1 126001 132A1.040.5 1756cc 1978 124CS1 132A1.031.5 1756cc 1979 124CS2 142514 132C2.040 1995cc 1980 124CS2 132C2.031 1995cc 1980 124CS2 157654 132C3.040 1995cc 1981 – 1985* 124CS0 171001 132C3.031 1995cc * Pininfarina Sold the 124 as the “Azzura” and “Spidereuropa” after 1982 10
FIAT 124 Spider Engine Maintenance + Modification 4. Carburetion FIAT Spiders manufactured from 1967 through 1980 were equipped with carburetors, except in California where the 1980 model year introduced fuel injection. Carburetors were provided by Weber SpA (Italy). FIAT and Weber have a long history; in the 1920s Eduardo Weber began producing carburetors for conversion kits intended for FIAT vehicles. His designs were the first progressive twin-barrel types with one barrel smaller than the other. Various updraft, downdraft, and sidedraft designs were produced by Weber and the carburetors were installed on vehicles ranging from small engine street cars to twelve cylinder racing cars. Weber carburetors are still used today in off-road, racing, and street applications. 4.1 Understanding Carburetors An easy way to understand how a carburetor works is to study a very simple type, the single-barrel, updraft carburetor. After this brief introduction we’ll work through subsequent improvements to arrive at carburetors similar to the one on your FIAT. F A B E D C Figure 2: Updraft Carburetor. A Float Chamber Vent , B Fuel Bowl or Chamber, with Float , C Spray Tube, D Fuel Jet , E Venturi , F Throttle Referring to figure 2, an updraft carburetor has the following features: • A fuel bowl or chamber (A) in which a float-controlled needle valve keeps the fuel constantly at a level 5-6mm lower than the fuel in jet (D). 11
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