EMPI Universal Pro-Sync Carburetor Synchronizer (Includes 1 Boot Adapter)

Achieve peak performance and a rock-solid idle with the EMPI Pro-Sync. Essential for anyone running a dual-carburetor setup, this precision instrument accurately measures air intake across all barrels so you can balance your engine perfectly.

Unlike older bubble-style gauges, the Pro-Sync lets air pass through without restriction, giving a highly accurate reading without stalling the engine or affecting the vacuum signal. The large, easy-to-read scale (graduated 1-30 kg/h) supports the fine-tuning required for crisp throttle response and optimal fuel economy.

Vehicle & Engine Fitment

A universal tool for air-cooled and water-cooled engines running multiple carburetors, including:

• VW Type 1, 2 & 3: Dual IDF, HPMX, Dellorto DRLA, or dual Solex/Kadrons.
• Porsche 356 & 912: Zeniths or Solex 40 PII setups.
• Performance Upgrades: Weber IDA or IDF equipped street and strip cars.
• British & European Classics: A wide range of side-draft (SU / Weber DCOE) applications using the included adapter.

Key Features & Benefits

• High-Resolution Scale: 1-30 kg/h numbered scale for precise tuning.
• Non-Restrictive Design: Won't choke the engine during the sync process.
• Versatile: Includes one rubber boot adapter to fit various intake diameters.
• Down-Draft & Side-Draft: Works with both carburetor configurations.
• Shop-Grade Build: Durable housing designed for professional shop use.

Technical Specifications

• Part Number: 43-5718-0
• Measurement Range: 1-30 kg/h numbered scale
• Included: One rubber boot adapter
• Compatibility: Down-draft and side-draft carburetors

Frequently Asked Questions

• How is this better than a bubble-style gauge? It allows air to pass through without restriction, giving an accurate reading without stalling the engine or affecting the vacuum signal.
• Does it come with an adapter? Yes — it includes one rubber boot adapter to fit various intake diameters.
• Which carburetors does it work with? Both down-draft and side-draft setups, including dual IDF, HPMX, Dellorto DRLA, Solex/Kadron, Weber IDA/DCOE, and SU applications.
• Is there a version with two adapters? Yes — EMPI 43-5712 is the same synchronizer with two boot adapters. This listing (43-5718-0) includes one.
• When should I sync my carbs? Check them at idle and again at roughly 2,500 RPM with the linkage held steady, so both carbs pull evenly across the rev range.

Installation

Tech Note: For the most accurate tune, synchronize your carburetors at both idle and at roughly 2,500 RPM (holding the linkage steady) to ensure your linkage geometry is pulling evenly across the entire powerband.

Explore Related Categories

Tuning your carbs? Browse Restoration Tools for more shop gear, Fuel & Intake for carbs and linkage, and EMPI for more parts from the brand.