EMPI Pro-Sync Carburetor Synchrometer — Squarrle-Cage, Dune Buggy Compatible, 1–30 kg/h Scale

EMPI Pro-Sync Carburetor Synchrometer is a squarrle-cage style visual tool that balances dual and multiple carburetors quickly and accurately without restricting airflow.

When tuning classic air-cooled engines—dune buggies, VW Beetles, Karmann Ghias, buses, or motorcycle trikes—matching the airflow of each carburetor is essential for smooth idling and consistent throttle response. The EMPI 43-5712 Pro-Sync offers a visual, meter-based approach to synchronization that works with both side-draft and down-draft carburetors. Supplied with two adapters, it fits a wide range of intake setups so you can sync multiple carbs using a single tool.

How does the Pro-Sync make carburetor balancing simpler?

Instead of relying purely on vacuum gauges or guesswork, the Pro-Sync provides a straightforward visual readout that shows the relative airflow of each carburetor. Its 1–30 kg/h numbered scale lets you compare sides and make micro-adjustments until the readings match.

• Clear 1–30 kg/h scale for direct comparison
• Squarrle-cage design yields stable, repeatable readings
• Visual indicator removes ambiguity during tuning

Will this tool work on my VW or dune buggy carburetors?

The EMPI Pro-Sync is built to be universal for most side-draft and down-draft carburetor configurations commonly used on VW models and aftermarket dune buggy setups. Two included adapters broaden compatibility so you can use one tool across different manifolds and throttle body sizes.

• Works with side-draft and down-draft carbs
• Includes two adapters for varied intake fittings
• Suitable for dual and multi-carb installations

Does the Pro-Sync affect engine airflow during measurement?

No—one key design feature is that it does not restrict airflow, so readings represent actual running conditions rather than artificially altered flow. That ensures the adjustments you make reflect real-world engine behavior.

• Non-restrictive flow path preserves genuine airflow
• Accurate readings during idle and low-throttle checks
• Helps achieve consistent mixture across carburetors

What level of precision can I expect using this synchronizer?

The numbered scale and cage design lend a high degree of repeatability, allowing you to balance carbs to small increments. While not a laboratory instrument, it offers shop-grade accuracy that’s more than adequate for road, race, and restoration work.

• Fine-graduated scale for incremental adjustments
• Visual confirmation reduces tuning errors
• Suitable for routine maintenance and performance tuning

Who is this for: The EMPI Pro-Sync Carburetor Synchrometer is aimed at DIY mechanics, vintage Volkswagen and dune buggy owners, restoration shops, and performance tuners who need an easy-to-read, reliable way to balance multiple carburetors. If you work on air-cooled engines with dual or multi-carb setups and want consistent, repeatable synchronization without altering airflow, this tool is designed for you.