15/05/2010
The open road, the wind in your hair, and the distinctive rumble of an Italian engine – for many, that's the essence of the Fiat 124 Spider. A modern reimagining of a classic, this stylish roadster brought a touch of la dolce vita to contemporary driving. However, whispers have turned into confirmed reports, signalling the imminent end of the 124 Spider's production. This news marks a significant moment for enthusiasts and poses questions about Fiat's direction in key markets. But beyond its recent market performance, the 124 Spider, particularly its classic predecessors and the spirit it embodies, holds a rich mechanical history, especially concerning the very heart of its power: the carburettor system.
The Sunset of a Spider: Production Discontinuation
The news of the Fiat 124 Spider's impending production halt has left many enthusiasts wondering about the factors at play. Launched as a collaborative effort with Mazda, sharing its platform with the highly successful MX-5, the 124 Spider aimed to inject Italian flair into a proven formula. Despite its undeniable charm and engaging driving dynamics, the sales figures tell a stark story. Through the third quarter of 2019, the Mazda MX-5 significantly outpaced the Fiat 124 Spider in sales, with 6351 units for the Mazda compared to a modest 2214 units for the Fiat. This considerable disparity in market uptake undoubtedly played a pivotal role in Fiat's decision to discontinue the model. The modern automotive landscape is fiercely competitive, and even niche vehicles like roadsters need to demonstrate a viable sales volume to justify their continued existence on the production line.
For Fiat, this discontinuation is part of a broader trend of streamlining its product offerings, especially in the crucial U.S. market. With the 500 city car already discontinued for 2020 and not expected to return anytime soon, the Fiat U.S. lineup is now notably thin, comprising only the 500X subcompact crossover and the somewhat unconventional 500L station wagon. This strategic contraction reflects a challenging environment for Fiat, forcing them to focus on their more commercially successful or strategically important models. The 124 Spider, despite its cult following and appreciative reviews, simply couldn't carve out a large enough market share to secure its future. Its brief return to the market, though warmly received by some, ultimately couldn't compete with the established dominance of its Japanese counterpart or Fiat's own evolving global strategy.
A Look Under the Bonnet: The Fiat 124 Spider's Carburettor Heritage
While the modern Fiat 124 Spider utilised contemporary fuel injection systems, the legacy of the original 124 Spider, and indeed many classic Fiat and Lancia performance vehicles, is inextricably linked to the intricate world of carburettors. At the heart of these revered machines lay the magnificent Fiat/Lancia twin-cam engine, a true masterpiece of automotive engineering, celebrated for both its robust performance and its aesthetic beauty. The very sound of a well-tuned DOHC engine, singing at redline through the throats of a pair of dual Weber IDF carburettors, is often described as nothing short of orchestral.
For specialists like Midwest-124, these engines are not just components but a passion, offering a spectrum of possibilities from bone-stock rebuilds to track-ready monsters. Every engine build is a bespoke project, tailored to the customer's desired results, with meticulous attention paid to performance, reliability, and visual appeal. Opening the bonnet to reveal a meticulously crafted engine, as gorgeous as the Italian sports car it powers, is a source of immense pride for owners.
The Weber Legacy: Performance and Precision
The choice of carburettor profoundly impacts an engine's character and output. While many stock configurations featured a single carburettor, such as the 32 ADF Weber found on some 1756cc setups, the true spirit of performance in these twin-cam engines often came alive with dual carburettor arrangements. The Weber IDF and Weber DCNF models are particularly synonymous with high-performance Fiat and Lancia applications. For instance, a common upgrade involves twin Weber IDF carburettors, often paired with an original waffle manifold that is port matched and smoothed for optimal airflow. This setup, often combined with a 4-2 header, allows the engine to breathe more freely, unleashing its full potential.
Custom Engine Builds: A Spectrum of Power
The versatility of the Fiat twin-cam engine, combined with the precision of Weber carburettors, allowed for a vast spectrum of customisation, making each 124 Spider a unique expression of its owner's desires. Consider some illustrative examples from custom builds:
- A 2-litre block and head for a Fiat Spider might feature a 10:1 compression ratio, custom MW124 intake and exhaust valves, and a fully balanced assembly. When paired with twin Weber IDF carburettors and a carefully prepared manifold, this configuration delivers a thrilling driving experience, optimised for both power and sound.
- For a 1979 Spider 2000, a 2-litre engine with 10:1 CR could boast a ported and polished head, full balancing, and powder-coated cam towers. This engine utilised MW124-designed intake and exhaust valves, Iskenderian springs, and a 40/80 intake cam, all meticulously tuned through its carburettor system to create a potent and visually stunning powerplant.
- A 2-litre Twin-Cam destined for a Lancia Scorpion might be configured with a 10:1 CR, full balancing, porting, and blueprinted components. It could feature aggressive PBS B-3 intake & S-2 exhaust cams, MW-124 intake and exhaust valves, and high-rev Iskenderian valve springs. The carburettor choice here could be twin Weber 40 DCNF carburettors, coupled with a converted 1608 distributor for optimal spark delivery.
- A 'WILD' street application might involve a 2-litre Twin-Cam with 10.25:1 CR, fully balanced, ported, and blueprinted. Equipped with 40/80 Pitatore cams, large intake and exhaust valves, and high-rev Iskenderian valve springs, the carburettor of choice for such a beast would be twin Weber IDF40 carburettors with 34mm main chokes. This level of tuning transforms the engine into something truly "INSANE," as one customer eloquently put it, offering exhilarating acceleration and a thrilling soundtrack.
- Even for 'MILD' street improvements, an 1756cc engine with an 84.6mm bore and approximately 9.0:1 CR, balanced, ported, and blueprinted, could retain stock valves, springs, and cams, still benefiting from a well-tuned carburettor system to enhance responsiveness and drivability without sacrificing reliability.
- A 'STOCK' example might involve a 2-litre block with stock pistons, light flex-honing, and a polished crank. Mated with a 1756 head, resulting in an 8.6:1 CR, and using stock cams, valves, and springs, this setup could be paired with a 1756 intake manifold and a single 32 ADF Weber carburettor, even in a 124 Spider with an automatic transmission. This demonstrates the versatility of the engine and the carburettor's role across various performance levels.
The meticulous process of port matching and shaping intake manifolds and cylinder head intake ports is crucial for optimising airflow, regardless of the carburettor choice. Balancing the rotating assembly, selecting appropriate pistons (e.g., 4.5mm dome for 10:1 CR), and integrating components like Miller's Mule adjustable cam gears or Plex-type distributor conversions all contribute to extracting the best possible performance from these classic engines and their carburettor systems. The inherent modularity and tunability of these engines, combined with the precision of Weber carburettors, allowed for a vast spectrum of customisation, making each 124 Spider a unique expression of its owner's desires.
Why Carburettors? The Allure of Analogue Power
In an era dominated by sophisticated electronic fuel injection, the enduring appeal of carburettors might seem anachronistic to some. Yet, for many automotive purists, the carburettor represents a direct, mechanical connection to the engine's heart. There's a raw, visceral quality to a carburettor-fed engine that modern systems, for all their efficiency and power, often struggle to replicate. The distinct induction roar of dual Webers, the tactile sensation of a mechanically linked throttle, and the sheer satisfaction of fine-tuning a system by hand are experiences that resonate deeply with enthusiasts.
This analogue charm is not merely nostalgic; it's about control and a deeper understanding of the engine's breathing. While modern fuel injection offers benefits in terms of fuel economy, emissions, and consistent performance across varying conditions, carburettors provide a unique avenue for customisation and character. However, this comes with its own set of considerations. Carburettors often require more frequent adjustment and maintenance to stay in optimal tune, and they can be more sensitive to environmental changes like altitude and temperature. Yet, for those who relish the art of engine tuning and the immersive experience of traditional mechanics, the carburettor remains an irreplaceable component in the legacy of the Fiat 124 Spider and its remarkable twin-cam engine, offering a driving experience that is as engaging as it is authentic.
Market Performance Comparison: Fiat 124 Spider vs. Mazda MX-5 (Q3 2019)
| Model | Units Sold (Q3 2019) |
|---|---|
| Mazda MX-5 | 6351 |
| Fiat 124 Spider | 2214 |
Representative Carburettor Setups for Fiat 124/Lancia Twin-Cam Engines
| Configuration Type | Engine Details (Example) | Carburettor Type | Key Features |
|---|---|---|---|
| Stock/Mild Street | 1756cc, ~9.0:1 CR | Single 32 ADF Weber | Balanced, ported, stock valves/springs/cams. Good daily drivability. |
| Performance Street | 2L, 10:1 CR | Twin Weber IDF | Ported/polished head, balanced, custom valves/cams. Enhanced airflow and sound. |
| High Performance/Track | 2L, 10.25:1 CR | Twin Weber IDF40 (34mm chokes) | Blueprinted, aggressive cams, large valves, lightened flywheel. Max power. |
| Specific Lancia Build | 2L Twin-Cam, 10:1 CR | Twin Weber 40 DCNF | Balanced, ported, PBS cams, high-rev springs. Precision tuning for track/street. |
Frequently Asked Questions About the Fiat 124 Spider
Q: Is the modern Fiat 124 Spider still being made?
A: Reports indicate that the Fiat 124 Spider is set to end production soon, if it hasn't already. This marks the discontinuation of the modern iteration of the roadster, which ran from 2016 to 2019 in some markets.
Q: Why was the Fiat 124 Spider discontinued?
A: The primary reason for its discontinuation appears to be lower sales figures compared to its platform-mate, the Mazda MX-5. Through Q3 2019, the Mazda significantly outsold the Fiat, making its continued production less viable for Fiat's market strategy.
Q: What kind of carburettor does a classic 124 Spider have?
A: Classic Fiat 124 Spiders, particularly those with the iconic twin-cam engine, often featured various carburettor setups. Stock configurations might have used a single Weber 32 ADF carburettor, while performance enthusiasts frequently upgraded to dual Weber IDF or DCNF carburettors for enhanced power and sound, often paired with custom manifolds and engine internals.
Q: Can I upgrade my classic 124 Spider's carburettor system?
A: Absolutely. Upgrading the carburettor system is a popular modification for classic 124 Spiders. Specialists like Midwest-124 offer custom engine builds that can incorporate dual Weber IDF or DCNF carburettors, along with other performance enhancements like porting, polishing, and custom cam setups, to significantly boost engine performance and driving enjoyment.
Q: What is special about Fiat's twin-cam engine?
A: The Fiat/Lancia twin-cam engine is widely regarded as a masterpiece of automotive engineering. It's renowned for its robust design, excellent performance potential, and beautiful aesthetics. Its overhead camshaft design allows for efficient valve operation, making it highly tuneable and capable of producing impressive power, especially when paired with well-tuned carburettors. It was a staple in many Fiat and Lancia performance models for decades.
Conclusion
The Fiat 124 Spider, in both its classic and modern guises, represents a unique chapter in automotive history. While the contemporary roadster bids farewell, a victim of challenging market conditions and fierce competition, its spirit lives on through the enduring legacy of its predecessors. The classic 124 Spider, with its celebrated twin-cam engine and the evocative symphony of its carburettors, remains a testament to Italian engineering and the joy of pure, unadulterated driving.
For those who appreciate the tactile feedback of an analogue machine and the art of mechanical tuning, the classic 124 Spider, with its potential for bespoke engine builds and carburettor customisation, will continue to be a cherished icon. Its departure from new car showrooms underscores an industry shift, but for enthusiasts, the real heart of the Spider beats in its past, ready to be revived and enjoyed on the open road for years to come. The legacy of its engineering, especially its iconic carburettor-fed engines, ensures its place in the hearts of automotive aficionados.
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