We’ve worked on several Type 1 Volkswagen engines requiring carburetor adjustments, and they can be quite tricky to get just right. Common issues include flat spots at low RPMs and needing a high idle to keep the engine running smoothly.
Start with the Basics
Before diving into carburetor work, ensure the fundamentals are in order:
1. Valve Clearances: Adjust to 0.15 mm both inlet and outlet.
2. Ignition System: Check that the ignition is functioning properly. Set the timing to 30 degrees BTDC at 3000 RPM (vacuum disconnected). This should result in an idle timing of approximately 12 degrees BTDC. (dynamic timing, not static)
The Carburetor
Originally, these engines came equipped with a Solex PICT carburetor. However, many now have aftermarket Chinese carburetors installed. These are easily identifiable as they lack the Volkswagen and Solex stamps on the fuel reservoir (see picture below).
While some report good experiences with these aftermarket carbs, we don’t. We recommend using a rebuilt original Solex carburetor and, if possible, pairing it with the original air filter housing for optimal performance.
Fine-Tuning for Emissions
Once the engine is warmed up, aim for the following CO emission levels:
• Idle: Between 3.00% and 4.50%.
• At 3000 RPM for 30 seconds: No lower than 1.5%.
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1. At Brooks, every product we make is built to last. We want our customers to drive away at ease and know their car is technically good. Although most of this work will go unseen, you’ll feel it the second you step behind the wheel.
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