Carburetor Synchrometer, Squirrel Cage Style

OVERVIEW

Achieving that perfect, rhythmic idle and seamless throttle response in a dual-carbureted air-cooled Volkswagen isn''t just about turning screws; it''s about precision airflow management. When you install a set of dual Webers, Dellortos, or Kadrons, you are essentially managing two separate engines that need to breathe in perfect harmony. Without a high-quality synchronization tool like the EMPI Squirrel Cage Style Synchrometer, you are merely guessing at your intake volume. Imbalanced carburetors lead to a host of performance-robbing issues, including a rough or "hunting" idle, sluggish acceleration, and that dreaded high-RPM popping that indicates one bank of cylinders is working harder than the other. This tool is the bridge between a "running" engine and a "tuned" masterpiece, ensuring that every cylinder is pulling its fair share of the air-fuel mixture for maximum efficiency and longevity.

The EMPI 7034-11 Synchrometer features a classic, proven "squirrel cage" design that has been a staple in the toolboxes of VW enthusiasts and professional builders for decades. Unlike digital gauges that can be overly sensitive to minor fluctuations or require external power sources, this mechanical unit provides a steady, easy-to-read visual indication of air velocity via a precision-weighted internal lever. The adjustable rotating dial allows you to calibrate the tool to the specific airflow requirements of your engine, whether you are tuning a mild 1600cc daily driver or a high-revving 2332cc stroker. Its compact footprint makes it ideal for tight engine bays where space between the carburetor intake and the decklid or firewall is limited. By using this synchrometer, you eliminate the guesswork, allowing you to match the draw of your carburetors at both idle and off-idle speeds for the smoothest power delivery possible.

FITMENT

This universal synchronization tool is designed for use with almost any air-cooled Volkswagen engine equipped with dual carburetors. It is compatible with the following models and carburetor configurations:

• Volkswagen Type 1: Beetle, Bug, and Super Beetle (All Years).
• Volkswagen Type 2: Bus, Transporter, Kombi, and Westfalia.
• Volkswagen Type 3: Fastback, Squareback, and Notchback.
• Volkswagen Karmann Ghia: All Years.
• Volkswagen Type 181: The Thing.
• Custom Applications: Dune Buggies, Sand Rails, Manx-style bodies, and Trikes.
• Carburetor Compatibility: Weber IDF, Weber IDA, Weber ICT, Dellorto DRLA, Dellorto FRD, Solex EIS/PDSIT, Kadron/Brosol, and EMPI HPMX/EPC series.

SPECS

The EMPI Squirrel Cage Synchrometer is engineered for durability and accuracy in the harsh environment of a hot engine bay.

• Manufacturer: EMPI.
• Part Number: 7034-11.
• Design Style: "Squirrel Cage" or "Snail" mechanical flow meter.
• Housing Material: High-impact, heat-resistant composite plastic.
• Internal Components: Precision-weighted aluminum lever and stainless steel pivot.
• Adjustment Type: Manual thumb-screw dial for airflow sensitivity range.
• Weight: Ultra-lightweight 0.3 lbs for easy handling.
• Compatibility: Fits velocity stacks and carburetor throats up to 5 inches in diameter.
• GTIN: 707924227000.

PRO TIPS

1. Always Sync at Operating Temperature

Never attempt to synchronize your carburetors on a cold engine. As an air-cooled engine warms up, the metal components expand, and the idle speed will naturally shift. Furthermore, if your carburetors are equipped with electric or manual chokes, they must be fully opened and disengaged before you start the tuning process. If you sync while the chokes are active, your settings will be completely incorrect once the engine reaches its normal operating temperature, leading to a poor idle and potential stalling at stoplights.

2. Don''t Forget the Off-Idle Synchronization

Many novice tuners only synchronize their carburetors at idle, but for true performance, you must check them "off-idle" as well. Once your idle air volume is matched, have an assistant hold the throttle steady at approximately 2,500 to 3,000 RPM (or use a throttle stick). Place the EMPI Synchrometer back on the carbs to ensure they are still pulling the same volume. If they are uneven at high RPM, it indicates that your throttle linkage rods are not adjusted to the same length or that one side is "lagging" behind the other, which is a primary cause of engine vibration and popping.

3. Master the Adjustment Dial

The rotating center dial on the EMPI 7034