Description
Product Overview
The iFJF 18990035 Weber 44 IDF carburetor is a premium replacement for 1968-1979 Volkswagen Beetle, Super Beetle, and Transporter (Bus) models with the 1.6L air-cooled engine. Featuring dual 44mm throttle bores, this 2-barrel downdraft carburetor delivers significantly improved throttle response, horsepower, and tunability compared to the stock Solex carburetor. Complete with integrated air horn and striking golden finish.
Key Features
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44mm Dual Throttle Bores — 44mm barrels provide ample airflow for modified 1600cc engines, including those with bigger camshafts, ported heads, or increased displacement (1776cc, 1915cc).
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Direct Solex Replacement — Same downdraft configuration as the factory Solex 34 PICT carburetor. Bolts to the stock intake manifold center section.
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Complete Assembly with Air Horn — Includes integrated air horn for cleaner intake airflow and better filtration mounting.
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Genuine Weber IDF Design — Based on the legendary Weber IDF circuit with tunable idle jets, main jets, air correction jets, and emulsion tubes — giving you full control over fuel calibration.
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Golden Finish — Corrosion-resistant golden chromate coating that looks as good as it performs.
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Tunable Accelerator Pump — Adjustable pump stroke for customizing tip-in fuel delivery.
Compatibility
| Year |
Model |
Engine |
| 1968-1979 |
VW Beetle (Type 1) |
1.6L 1584cc H4 |
| 1971-1979 |
VW Super Beetle |
1.6L 1584cc H4 |
| 1968-1971 |
VW Transporter Type 2 (211/215/261/265) |
1.6L 1584cc H4 |
| 1968-1974 |
VW Karmann Ghia |
1.6L 1584cc H4 |
| 1968-1973 |
VW Type 3 (Fastback/Squareback) |
1.6L 1584cc H4 (center mount only) |
Specifications
| Parameter |
Value |
| OEM Part Numbers |
18990035, 18990030, 18990.035V |
| Carburetor Type |
2-Barrel Downdraft (Weber IDF) |
| Throttle Bore |
44mm (x2) |
| Venturi Size |
36mm |
| Mounting Pattern |
Standard IDF/Centro-Mount |
| Choke |
None (performance carburetor) |
| Fuel Inlet |
M10x1.0 Banjo Fitting |
Why Upgrade to Weber IDF?
The factory Solex 34 PICT-3 carburetor was adequate when new but is now notorious for warped throttle bodies, clogged idle circuits, and difficult cold starts. The Weber IDF design has been the gold standard for air-cooled VW performance since the 1970s. It offers superior tunability with replaceable jets, a more robust accelerator pump circuit, and dramatically improved throttle response. Whether you're restoring a daily driver or building a weekend cruiser, this carburetor transforms how your vintage VW drives.
Installation Tips
- Use new paper gaskets on both sides of the phenolic spacer block
- Set idle mixture screws at 1 turn out from seated as starting point
- Verify fuel pressure at 2.5-3.0 PSI — mechanical pumps may need a regulator
- Base idle speed: 850-900 RPM on air-cooled engines
- Check for vacuum leaks at intake boots and manifold end castings before tuning
- With a 009 mechanical advance distributor, set timing to 28-32° BTDC at 3000+ RPM
Frequently Asked Questions
Q: Will this fit my 1974 Super Beetle with stock engine?
A: Yes. The 18990035 Weber 44 IDF is a direct bolt-on replacement for the stock Solex carburetor on your 1974 Super Beetle 1600cc. It bolts to the factory intake manifold center section.
Q: Do I need to change my distributor when installing this carburetor?
A: The Weber 44 IDF works well with both vacuum-advance (SVDA) and centrifugal-advance (009) distributors. If using a 009, make sure the vacuum port on the carb is capped.
Q: Is this carburetor too big for a stock 1600cc engine?
A: The 44 IDF is properly sized for stock to mild 1600cc engines when properly jetted. It comes pre-calibrated for 1600cc. If upgrading to 1776cc or larger, you may want to increase main jet sizes.
Q: What air filter fits on this carburetor?
A: The integrated air horn accepts standard IDF-style air filter assemblies. Low-profile oval filters (commonly available for Beetle engine bays) fit perfectly.
Q: Does this carburetor work with dual carb setups?
A: This carburetor is designed for single center-mount applications. For dual carb setups, consider dual 40 IDF or 44 IDF kits with appropriate manifolds.
Q: Will I need to re-jet for my elevation?
A: At elevations above 4,000 ft, you may want to reduce main jet size by 5-10 numbers. Below 4,000 ft, the factory jetting will work well.
