Air Jet DGV, DFV, ICT, EPC 150

OVERVIEW

When it comes to extracting every ounce of performance from your air-cooled powerplant, precision is the name of the game. The EMPI Air Jet for DGV, DFV, ICT, and EPC series carburetors is a critical component for any enthusiast looking to dial in their air-fuel ratio with surgical accuracy. These air correction jets play a pivotal role in the high-speed circuit, controlling the amount of air that mixes with the fuel as it leaves the emulsion tube. By selecting the .150 size, you are making a deliberate choice to fine-tune your engine''s behavior at higher RPMs, ensuring that your Beetle, Ghia, or Bus doesn''t stumble or run dangerously lean when you are cruising at highway speeds or pushing through a spirited canyon run. A properly sized air jet allows the fuel to atomize correctly, preventing the "main circuit" from becoming overly rich as air velocity increases through the venturi.

At Appletree Auto, we know that a generic setup rarely works for a custom engine build. Whether you are running a set of dual Weber ICTs on a 1600cc upright or a Progressive DGV on a Type 4 2.0L, the air jet is your primary tool for flattening the fuel curve. EMPI manufactures these jets to exacting tolerances from high-quality brass, guaranteeing that the flow rate is consistent and reliable. Replacing a clogged or incorrectly sized jet with this genuine EMPI 150 air jet can be the difference between a temperamental engine and one that purrs with mechanical perfection. Don''t settle for ''close enough'' when you can achieve the crisp throttle response and optimal fuel economy that comes from a perfectly jetted carburetor. These jets are sold individually, allowing you to buy exactly what you need for your specific dual or single carb application.

FITMENT

This air jet is designed for use with a wide variety of Weber and EMPI carburetors commonly found on vintage Volkswagen, Porsche, and other specialty applications. Detailed fitment includes:

• Volkswagen Beetle (Type 1): 1950-1979 models equipped with Weber ICT, DGV Progressive, or EMPI EPC carburetors.
• Volkswagen Karmann Ghia: 1956-1974 models utilizing dual ICT or EPC setups.
• Volkswagen Bus/Transporter (Type 2): 1950-1971 (1600cc) and 1972-1979 (Type 4 engines) running Progressive DGV or dual ICT conversions.
• Volkswagen Type 3 (Squareback, Fastback, Notchback): 1961-1973 models with dual ICT or EPC intake systems.
• Volkswagen Thing (Type 181): 1973-1974 models with upgraded Weber-style carburetion.
• Weber Carburetor Series: Specifically fits DGV, DGAV, DGEV, DFV, DFAV, DFEV, and ICT series.
• EMPI Carburetor Series: Fits EPC 34 and EPC 38 models, as well as EMPI-branded Progressive carburetors.
• Holley/Weber Conversions: Compatible with various licensed Holley versions of the 5200 series (Weber 32/36).

SPECS

The following technical specifications ensure that this component meets the rigorous demands of your high-performance or stock VW engine:

• Brand: EMPI (The gold standard in air-cooled VW aftermarket parts).
• Part Number: 77201.150.
• Jet Size: 150 (Equivalent to a 1.50mm orifice).
• Material: High-grade, precision-machined yellow brass for corrosion resistance and thermal stability.
• Jet Type: Air Correction / Air Bleed Jet.
• Thread Pitch: Standard Weber small-pattern air jet threads.
• Function: Regulates air volume in the emulsion tube circuit to lean out the mixture as RPM increases.
• Compatibility: Interchanges with original Weber part numbers for DGV/ICT/EPC series.
• Quantity: Sold Individually.

PRO TIPS

Tip 1: Understanding the Air Correction Curve

It is vital to remember that the air jet has the opposite effect of a fuel jet. In the world of Weber tuning, a larger air jet will actually lean out your mixture, particularly at high RPMs. If your engine feels "lazy" or "heavy" at the top end of a gear, or if you notice black smoke from the exhaust at wide-open throttle, stepping up to this 150 air jet from a smaller size (like a 140) can help "thin out" the fuel and crisp up the performance. Conversely, if you experience a high-speed lean pop or surging, you may need to go smaller. Always tune your main fuel jets first, then use the air jet to refine the high-speed transition.

Tip 2: Never Use Wire to Clean Brass Jets

One of the most common mistakes we see at Appletree Auto is a customer trying to clean a clogged jet with a piece of safety wire or a sewing needle. Brass is a relatively soft metal, and even the slightest scratch inside the orifice can completely change the flow characteristics of the jet, rendering the "150" stamping inaccurate. If you find debris in your air jet, use only specialized aerosol carburetor cleaner and high-pressure compressed air to clear the blockage. If the corrosion is too heavy to blow out, it is always cheaper and safer to replace the jet with a new EMPI unit than to risk an uneven fuel map across your cylinders.

Tip 3: The Importance of Synchronization in Dual Carbs

If you are installing these jets in a dual-carb setup, such as Weber ICTs or EMPI EPCs, it is absolutely imperative that both carburetors use identical jetting. Even a slight variation between the left and right banks can lead to uneven cylinder head temperatures and "stumbling" during acceleration. When you change the air jet to a 150 on one side, ensure the other side matches perfectly. We also recommend using a high-quality Synchrometer to balance the airflow between the two carburetors after any internal jetting changes, as the change in fuel atomization can slightly alter your idle and transition requirements.