Main Jet DGV, DFV, ICT EPC 140

OVERVIEW

When it comes to squeezing every ounce of power and reliability out of your air-cooled Volkswagen, the devil is truly in the details of your carburetor''s internal calibration. The EMPI Main Jet for DGV, DFV, and ICT/EPC series carburetors is a critical component for any enthusiast looking to dial in their air-fuel mixture for peak performance. Whether you are running a progressive 32/36 DGV on a daily driver or a set of dual 34 ICTs on a spirited weekend cruiser, the main jet is the primary controller of the high-speed circuit. These precision-machined brass jets allow you to control exactly how much fuel enters the venturi during cruising and wide-open throttle transitions, ensuring that your engine doesn''t lean out and overheata common cause of catastrophic failure in the magnesium and aluminum cases of Type 1, 2, and 3 engines.

This specific 140-sized jet is engineered to the highest standards, offering the consistency that master tuners demand when chasing the perfect spark plug color. In the world of air-cooled performance, "close enough" simply isn''t good enough; a jet that is even slightly off-spec can lead to sluggish acceleration, poor fuel economy, or dangerous pre-ignition. By utilizing these EMPI main jets, you are investing in a component that has been an industry standard for decades. Designed to fit perfectly into the jet stack or holder of your Weber or EMPI carburetor, these jets make the tuning process straightforward and repeatable. This allows you to swap sizes quickly at the track or in your home garage until your flat-four engine sings with the crisp, responsive throttle return and smooth power delivery that every vintage VW owner strives to achieve.

FITMENT

This Main Jet is designed for use with the following carburetor models and air-cooled Volkswagen applications:

• Compatible Carburetor Models: Weber 32/36 DGV, 32/36 DGAV, 32/36 DGEV, Weber 34 ICT, Weber 34 ICH, Weber 32/36 DFV, DFV, DFAV, DFEV, and EMPI EPC 34 series.
• VW Beetle (Type 1): 1950-1979 (When equipped with aftermarket Weber/EMPI progressive or dual ICT kits).
• VW Karmann Ghia: 1956-1974 (Equipped with DGV/ICT carburetor conversions).
• VW Bus / Transporter (Type 2): 1950-1979 (Ideal for dual ICT setups on 1600cc-2000cc engines).
• VW Type 3 (Fastback, Squareback, Notchback): 1961-1973 (Using dual ICT or progressive center-mount setups).
• VW Thing (Type 181): 1973-1975 (Perfect for upgrading off-road performance via carburetor tuning).

SPECS

• Jet Size: 140 (1.40mm precision-drilled orifice).
• Material: High-grade 360 series brass for superior corrosion resistance and longevity.
• Thread Type: Precision-cut metric threads for a secure, leak-free fit in the jet holder.
• Application: Main fuel circuit (high-speed circuit).
• Compatibility: Interchangeable with original Weber and EMPI EPC components.
• Head Style: Slotted for easy installation and removal with a standard flat-head screwdriver.
• Sold As: Individually (Single unit).

PRO TIPS

1. The Art of Reading Spark Plugs

When installing a 140 main jet, it is essential to perform a "plug chop" to verify your air-fuel ratio. Drive the vehicle at a steady cruising speed (approx. 3,500 RPM) for a few minutes, then safely pull over and shut the engine off immediately without idling. Remove a spark plug and inspect the ceramic insulator. A light tan or "coffee with cream" color indicates that your 140 jet is likely the correct size for your engine and altitude. If the plug is white or blistered, you are running lean and may need to step up to a larger jet. If it is black and sooty, the 140 is too rich, and you should consider stepping down.

2. Altitude and Air Density Adjustments

Always remember that air density significantly impacts your jetting requirements. If you are tuning your VW in a high-altitude environment, such as the Rocky Mountains, your engine will require less fuel due to the thinner air, meaning a 140 jet might run richer than it would at sea level. Conversely, if you are at sea level with dense, cold air, your engine may require more fuel to maintain the correct ratio. Keep a selection of jets in your toolbox so you can adjust your calibration if you plan on driving through varying elevations or during extreme seasonal temperature shifts.

3. Proper Maintenance and Cleaning

Never, under any circumstances, use a metal wire or a drill bit to clean a clogged brass jet. Brass is a soft metal, and even the slightest scratch or deformation of the internal orifice will completely change the flow characteristics, rendering the "140" marking inaccurate. If you suspect a clog from debris in your fuel system, use pressurized carburetor cleaner and compressed air to blow the obstruction out. If the jet is heavily tarnished or corroded, it is always safer and more cost-effective to replace it with a fresh EMPI jet rather than risking an inconsistent tune that could lead to engine damage.