Webers on the MK1 Lotus Cortina
The following information is for MK1 Cortina Lotus 40 DCOE 18 and DCOE 31 Weber carburettors.
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| Standard engine with type B cam | Special Equipment motor with type C cam | Super Special Equipment and Big Valve (type D cam) | |
| Choke | 30 mm | 32 mm | 33 mm |
| Main Jet | 115 | 115 | 120 |
| Air correcting jet | 200 | 150 | 155 |
| Slow running jet | 50 F8 (45 F9 type 18) | 50 F8 | 50 F8 |
| Accelerator pump jet | 40 | 40 | 35 |
| Accelerator pump stroke | 10 mm | 10 mm | 10 mm |
| Starter air jet | 100 | 100 | 100 |
| Starter petrol jet | F.5 / 100 | F.5 /100 | F.5 / 100 |
| Emulsion tube | F 11 | F 11 | F 11 |
| Needle valve | 1.75 | 1.75 | 1.75 |
| Ram pipe (air trumpet) length | 1.5 in /3.8 cm type 31 (1.75 in /4.4 cm type 18) | 1.5 in /3.8 mm | 1.5 in / 3.8 mm |
| Float levels | 8.5 mm (Including gasket) & 15 mm | 8.5 mm (Including gasket) & 15 mm | 8.5 mm (Including gasket) & 15 mm |
| Idling speed | 800 -900 rpm | 800 - 900 rpm | 800 - 900 rpm |
NOTE: Type 40 DCOE 18 was used on early standard motors and Special Equipment engines.
Type 40 DCOE 31 was used on late standard, Special Equipment and Big Valve engines.
File size is 133Kb.
Key to the diagram:-
| 1 Jet inspection cover | 24 & 24A Nut | 49 Nut | 73 Seal |
| 2 & 2A Screw | 25 Retaining plate | 50 Lever | 74 Screw plug |
| 3 Gasket | 26 Stud | 51 Screw | 75 Intake & discharge valve |
| 4 & 4A Washer | 27 Lockwasher | 52 Nut | 76 Starter jet |
| 5 Carburettor cover | 28 Nut | 53 Return spring | 77 Float |
| 6 Gasket | 29 Gasket | 54 Cover | 78 Fulcrum pin |
| 7 Emulsion tube holder | 30 Well bottom cover | 55 Sector shaft | 79 Valve ball |
| 8 Air correction jet | 31 Carburettor body | 56 Air Filter | 80 Stuffing ball |
| 9 Idling jet holder | 32 Anchoring plate | 57 Screw | 81 Screw plug |
| 10 Emulsion tube | 33 Spindle return spring | 58 Washer | 82 Washer |
| 11 Idling jet | 34 Lever fixing pin | 59 Starter valve | 83 Needle valve |
| 12 Main jet | 35 Pump control lever | 60 Spring | 84 & 86 Washer |
| 13 Plate | 36 & 37 Stud | 61 Spring retainer & guide | 85 Union |
| 14 Choke | 38 Ball bearing | 62 Spring washer | 87 Union bolt |
| 15 Auxiliary venturi | 39 Screw | 63 Retaining plate | 88 Fuel filter |
| 16 Dust cover | 40 Throttle valve | 64 Accelerator pump control rod | 89 Washer |
| 17 Spring | 41 Spindle | 65 Spring | 90 Filter inspection plug |
| 18 Spring cover | 42 Screw | 66 Pump piston | |
| 19 Throttle lever | 43 Washer | 67 Spring | |
| 20 Spring | 44 Screw | 68 Idling adjustment screw | |
| 21 Throttle adjusting screw | 45 Cover | 69 Air intake trumpet | |
| 22 Auxiliary venturi retaining screw | 46 Gasket | 70 Progression hole inspection screw | |
| 22A Choke retaining screw | 47 Starter device | 71 Gasket | |
| 23 & 23A Spring washer | 48 Lever | 72 Pump jet |
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