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Fuel Injection

This section is just intended for information. I have tried to list out the jetting of the various carbs fitted to the flat 4's over the years. These are all standard jettings, and are mainly UK ones. Any extras then let me know (especially the 1.5 engined cars fitted with the 40mm carbs in Germany).

Car Carb Model Part Number Venturi Centering device Main jet Main air jet Diffuser Idling jet Idling air corrector Progression holes Accelerator pump jet Needle valve Float weight Starting jet Starting diffuser Accelerator pump volume per 20 strokes Float level dimensions
1700 Series 2 Dellorto DRLA 40 FD / FS 546.860 / 546.861 32mm   142 180 9164.2 52 220 100 - 160 - 140 - 180 - 180 33 150 10g 80 7482 5.5~6.5 20~22mm
1700 Series 2 Weber 40 IDF 69 / 68 546.858 / 546.859 32mm   140 190   50 195 100 - 120 - 130 - 140 - 150 35 175 11.8g 70 F7 5~8  
1200 Arna Dellorto FRDA 32F 534.058 24mm   120 205   50 125 100 - 100 - 100 - 130 45 150 7.5g     5~7 5~6mm
1200 Arna Solex 32 DIS/40 534.539 24mm   137 165   62 80 110 - 110 - 110 - 130 45 160       11~13 3~3.5mm
1350 Arna Dellorto FRDA 32G 536.214 24mm   120 205   50 125 100 - 100 - 100 - 130 45 150 7.5g     6~8 5~6mm
1350 Arna Solex 32 DIS/41 536.213 24mm   137 165   62 60 110 - 110 - 110 - 130 45 160       10~14 6.7~7.5
1200 Arna Weber 32DIR51A/250 534.537 23mm / 24mm 3.5 / 4.5 122 / 130 180 / 170 F68 / F67 50 185 / 115 120 - 100 - 100 - 100 / 120 - 120 - 120 50 175 11g     17~20 6.75~7.25mm
1200 Arna Solex C 32 EIES 45 534.131 23mm   120 / 135 170 / 190   55 135 / 120 110 - 110 - 130 / 120 - 120 55 160 7.5g     8~10 / 8~10  
1350 / 1500 Arna (twin carb) Dellorto DRLA 36D / 36S 536.974 / 536.975 30 10078.01.68 122 180 9164.02.28 52 220 100 - 160 - 160 - 180 - 180 33 150 10g     7~9 5~6mm
1350 / 1500 Arna (twin carb) Weber 36 IDF 45A / 44A 536.574 / 536.575 30 4.5 135 220 F50 52 200 90 - 120 - 130 - 140 - 150 33 175 11.8g     6~9 9~9.5mm
Alfasud ti Weber 32 DIR 41 531.382 23mm / 24mm 3.5 / 4.5 125 / 135 180 / 170 50 / 50 170 / 120 120 - 100 - 100 / 120 - 120 - 120 45 175 11g     16~20 7.5mm
Alfasud ti Weber 32 DIR 41 531.382 23mm / 24mm 3.5 / 4.5 125 / 135 180 / 170   50 / 50 170 / 120 120 - 100 - 100 / 120 - 120 - 120 45 175 11g     16~20 7.5mm
Alfa 33 Series 3 1200? Weber 40 IDF 69 / 68   32mm   140 190   50 195 100 - 120 - 130 - 140 - 150 35 175 11.8g 0.90 F.7 5~8  
Alfa 33 Series 3 1200? Dellorto DRLA40 FD / FS   32mm   142 180 9164.4 52 220 100 - 140 - 140 - 140 - 140 35 150 10g 0.80 7482 5.5~6.5 20~22mm
Alfa 33 Series 3 1350 Weber 40 IDF 83 / 82   28mm   122 190 F67 50 195 100 - 120 - 130 - 140 - 150 35 175 11.8g COF5   6~9  
Alfa 33 Series 3 1350 Dellorto DRLA 40 FD / FS   28mm   118 175 9164.01 46 220 100 - 140 - 140 - 140 - 140 33 (35 from chassis number 5803275) 150 10g 0.95 7482.03 5.5~6.5 20~22mm
Alfa 33 Series 3 1500 Weber 40 IDF 85 / 84   30mm   135 190 F71 50 195 100 - 120 - 130 - 140 - 150 33 175   80F5   6~9  
Alfa 33 Series 3 1500 Dellorto DRLA 40 FD / FS   30mm   135 200 9164.01 46 220 100 - 140 - 140 - 140 - 140 33 (35 from chassis number 5803275) 150 10g 95 7482.03 5.5~6.5 20~22mm
Note, I think the 1200 engine size on the 33 series 3 is a typo on the fiche. The jetting seems to be the same as on the series 2 1700.