Air Jet DGV, DFV, ICT, EPC 190

OVERVIEW

Precision tuning is the heartbeat of a high-performance air-cooled engine, and the EMPI 190 Air Jet is a critical component for those seeking to master their fuel-to-air ratios. When you are running a Weber DGV, DFV, or ICT carburetor, or the EMPI EPC equivalent, the air jet serves as the primary controller for the air bleed into the emulsion tube. This specific .190 size is engineered to help lean out the mixture at higher RPMs, preventing the engine from running overly rich as the venturi vacuum increases. For the seasoned VW enthusiast, having a selection of these precision-machined brass jets is the difference between a sluggish throttle response and a crisp, high-revving power band that pulls all the way to the redline. Whether you are dialing in a daily driver Beetle or a weekend warrior Ghia, the 190 air jet provides the granular control necessary to compensate for altitude, ambient temperature, and engine displacement variations.

At Appletree Automotive, we understand that "close enough" isn''t good enough for a classic Volkswagen. These EMPI air jets are manufactured to exacting tolerances to ensure consistent flow rates across every part we sell. The air jet works in tandem with your main fuel jet and emulsion tube to define the "slope" of your fuel curve; by selecting the 190 size, you are effectively fine-tuning the high-speed circuit to ensure that your engine doesn''t "choke" on excess fuel when the secondary butterflies open or when you are cruising at sustained highway speeds. Don''t settle for a generic setup that leaves horsepower on the table. Investing in the correct air jetting allows your air-cooled flat-four to breathe properly, run cooler, and deliver the reliable performance that has made these engines legendary for decades. This is an essential upgrade for any Weber conversion kit where out-of-the-box jetting just doesn''t meet the specific demands of your unique engine build.

FITMENT

This air jet is designed for use with the following carburetor models and Volkswagen applications utilizing aftermarket induction systems:

• Carburetor Models: Weber 32/36 DGV, 32/36 DFV, 34 ICT, and EMPI 34 EPC Series.
• VW Type 1: Beetle and Super Beetle (1946-1979) with Weber/EMPI conversions.
• VW Type 2: Bus, Transporter, and Kombi (1950-1971) with upright engine configurations.
• VW Type 3: Fastback, Squareback, and Notchback (1961-1973) using ICT/EPC dual carb setups.
• VW Type 14: Karmann Ghia (1955-1974).
• VW Type 181: Thing (1973-1974).
• Engine Displacements: Ideal for 1600cc, 1641cc, 1776cc, 1835cc, and 1914cc builds.

SPECS

Detailed technical specifications for the EMPI 190 Air Jet:

• Part Number: 77201.190
• Jet Size: 190 (Equivalent to a 1.90mm orifice).
• Material: High-grade, corrosion-resistant yellow brass.
• Thread Type: Standard Weber air bleed pitch for DGV/ICT/EPC.
• Application: High-speed air correction circuit.
• Quantity: Sold individually (Each).
• Manufacturing: Precision CNC machined for flow accuracy.

PRO TIPS

Tip 1: Understanding the Inverse Relationship

Unlike main fuel jets, where a larger number means more fuel (richer), air jets work in the opposite direction. A larger air jet, such as this 190, allows more air into the emulsion tube, which actually leans out the mixture at higher engine speeds. If your VW is stumbling or "puffing" black smoke at high RPMs, stepping up to a 190 or 200 air jet can often clean up that rich condition and improve top-end pull without affecting your low-end idle or transition circuits.

Tip 2: The Emulsion Tube Symbiosis

Always remember that the air jet and the emulsion tube work as a team. The air jet introduces air through the tiny holes in the side of the emulsion tube to "pre-atomize" the fuel before it reaches the auxiliary venturi. When installing the 190 air jet, ensure your emulsion tubes (typically F7 or F11 for ICTs) are clean and free of varnish. Even a microscopic blockage in the emulsion tube will negate the precision of your new 190 air jet, leading to inconsistent tuning results.

Tip 3: Avoid Over-Tightening the Brass

Brass is a soft metal, and these jets are precision instruments. When installing the 190 air jet into the top of your carburetor, use a properly sized flat-head screwdriver that fits the slot perfectly to avoid "burring" the edges. Snug the jet down until it seats firmly, but do not over-torque it. Over-tightening can distort the orifice or make future removal nearly impossible without damaging the carburetor body. A light touch is all that''s required for a perfect, leak-free seal.