The Weber 45 DCOE is one of the most iconic side-draught carburettors ever produced—known for its razor-sharp throttle response, exceptional airflow, and unbeatable tuning flexibility. This specific 4 progression hole variant offers enhanced low-to-mid throttle transition, providing smoother drivability and superior fuel metering compared to earlier designs.
A great choice for larger 4 cylinder high-output engines (adaptable to 6 and some 8 cylinders), the 45 DCOE delivers outstanding top-end power while maintaining precise control across the entire RPM range. Its modular jetting system and fully adjustable setup make it a favourite among tuners, race teams, and enthusiasts building classic performance engines.
Whether used alone or as part of a full multi-carb setup, the Weber 45 DCOE offers a perfect balance of race-proven performance, reliability, and tunability.
Key Features:
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4 progression hole design for smoother transition and refined part-throttle drivability
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High-flow side-draught layout ideal for performance and motorsport applications
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Crisp, immediate throttle response across all RPM ranges
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Fully tunable with interchangeable jets, chokes, emulsion tubes, and venturis
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Proven motorsport pedigree—a favourite on classic racing and high-performance engines
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Durable Weber construction built to handle demanding conditions
- Suitable for multi-carb setups on engines requiring high airflow (dual or triple configurations)
The greatest feature of this carburettor is its ease of turnability – factory calibration:
| Venturi |
36mm |
| Aux Venturi |
4.5 |
| Main Jet
|
145 |
| Air Corrector |
155 |
| Emulsion Tube |
F16 |
| Idle Jet |
55F8 |
| Needle Valve |
200 |
| Pump Jet |
45 |
| Pump Spill |
40 |