Unpacking the VW Type 4 Engine & Car

When Volkswagen unveiled its Type 4 engine in 1968, it truly marked a significant leap forward in automotive engineering for the marque. This powerplant was, without a doubt, their most technically advanced to date, setting new benchmarks for air-cooled designs. Far removed in both aesthetics and mechanical design from the familiar Type 1 unit found in the Beetle, the Type 4 engine still commands respect today, particularly for its remarkably smooth power delivery. This article delves into the core features, evolution, and the vehicles that housed this innovative engine, alongside a look at the Volkswagen Type 4 car itself.

The Genesis of the Volkswagen Type 4 Engine

The early 1960s saw Volkswagen eyeing the lucrative family car market. To truly compete, they needed a vehicle offering substantially more luggage space than their existing models. This ambition spurred the development of a novel, flatter engine design, specifically crafted to fit snugly beneath the floor, thereby liberating valuable boot space. This innovative concept first saw the light of day in the Volkswagen Type 3. However, as the decade drew to a close, VW harboured aspirations of marketing an even larger, more sophisticated vehicle – a car that would ultimately become the 411. This new, more ambitious project necessitated a completely fresh engine design, leading directly to the creation of the Type 4 engine.

Design Innovations: Low-Down Torque & Over-Square Characteristics

While the Type 4 engine's cooling shroud gave it a visually distinct appearance from the Beetle's Type 1 powerplant, its engineering differences ran far deeper. The original 1679cc unit, delivering 76bhp, was notably 'over-square'. This term refers to an engine design where the pistons and cylinders are significantly wider than they are long, resulting in a much shorter piston stroke. This 'over-square' configuration yielded several crucial benefits. Firstly, it contributed to a more robust and durable engine. Secondly, and perhaps most importantly for its intended application, it produced an abundance of low-down torque. This characteristic allowed the Type 4 engine to cruise effortlessly at high speeds while simultaneously generating less heat and experiencing reduced stress on its components. In essence, it was perfectly suited to power heavier, more refined luxury cars, enabling the original 411 to accelerate from 0-50mph in a respectable 11.5 seconds and achieve a top speed of 90mph.

The Evolution of Power: From Carburettors to Fuel Injection

The Type 4 engine underwent several significant enhancements throughout its production life, consistently boosting its performance and refinement.

• Initial 1679cc (76bhp): The original iteration, featuring a twin carburettor setup, provided a solid foundation for the new Type 4 car.
• Bosch D-Jetronic (1972, 80bhp): A pivotal upgrade arrived in 1972 with the introduction of Bosch D-Jetronic electronically controlled fuel injection. This sophisticated system provided a welcome boost in power to 80bhp and was accompanied by a name change for the car to 411LE. This engine variant found its way into the VW Porsche 914 and also powered the first 412 models when they debuted in August 1972. In the 412, this engine allowed a 0-65mph sprint in 15 seconds and a maximum speed of 96mph.
• 1800cc (1795cc, 85bhp): Towards the end of the Type 4 car's production, the engine's capacity was increased to 1795cc. Interestingly, fuel management reverted to a twin carburettor arrangement for this iteration, and the car's designation changed from 412LE to LS. This 1.8-litre engine boasted 85bhp, enabling a 0-60mph dash in 13 seconds, with its top speed reportedly reaching 'a ton' (100mph).
• 2000cc (1970cc, 99bhp): Although Type 4 car production ceased in 1974, the engine's journey continued. Its capacity eventually increased to 2.0-litres (specifically 1970cc) around 1976, becoming an option in the Type 2 (VW Bus/Transporter). It even saw service in the T25 from 1980 to 1983, though by this point, given the T25's considerable weight, it began to feel somewhat underpowered.

The Porsche 914 Connection

As many enthusiasts are aware, the Porsche 914 was a collaborative design and development effort between Volkswagen and Porsche. The Type 4 engine played a central role in this mid-engined 'pocket rocket'. All 914s were factory-fitted with fuel injection, with one notable exception: the AN engine code fitted to the European 1800cc model, which utilised Solex 40 PDSIT carburettors and was quoted at 100 hp. It's worth noting that many fuel-injected 914s later had their original FI systems replaced with twin carburettor kits. The 914 model range began with the 1679cc engine producing 79bhp, later replaced by the 1795cc unit offering 84bhp, and concluded its production run with the 1970cc engine providing a healthy 99bhp.

Evolutionary Enhancements and Tuning Potential

Beyond capacity increases, the Type 4 engine continued to evolve. From around 1978, it incorporated hydraulic lifters, which eliminated the need for manual valve adjustments (often indicated by a sticker advising against adjustment). Electronic ignition followed from 1979, further enhancing reliability and performance. It's crucial to understand that very few components, if any, are interchangeable between the Type 4 engine and the Type 1 Beetle engine; everything from the tinware to the exhaust is distinct. From a performance perspective, the rugged Type 4 engine has long been a favourite among tuners. Although fitting it into a Beetle's engine bay requires significant fabrication due to its extra width, a properly set up Type 4 with beefier carburettors transforms into a formidable piece of kit, offering a substantial power upgrade.

The Volkswagen Type 4 Car: The 411 and 412

Volkswagen's foray into the larger family car segment culminated in the development of the Type 4 model, specifically the VW 411 and VW 412. Both vehicles were manufactured between 1968 and 1974. The Type 4 car made its public debut at the Paris Motor Show in October 1968. At its introduction, the 411 stood as VW's largest passenger vehicle, housing the company's largest engine to date, firmly placing it in the mid-size to large family car class. Both the 411 and 412 models maintained the classic Volkswagen air-cooled, rear-engine, rear-wheel-drive, boxer engine configuration.

In total, Volkswagen produced only 367,728 Type 4 models during this six-year period, a relatively modest figure when compared to the astonishing production numbers of the Volkswagen Beetle. Public perception was somewhat mixed, with quite a few individuals finding these models less aesthetically pleasing than the VW Type 3.

VW Type 411 (1968-1972)

The VW Type 411 model was produced from 1968 until 1972. It was initially powered by the 1679cc Flat-4 engine. From the summer of 1969, the 411 engine, cleverly hidden beneath the rear boot floor, benefited from the D-Jetronic fuel injection system, which instantly boosted its power output to 80bhp.

The 411 was equally groundbreaking beneath its skin. It featured pioneering built-in crumple zones for enhanced safety and a sophisticated, Porsche-inspired fully independent suspension system. This setup included MacPherson struts at the front and a double-jointed arrangement at the rear, mirroring the design principles found in the Porsche 911. This advanced suspension system, a truly spanking new configuration for VW, subsequently paved the way for its adoption in the popular 1302/1303 Super Beetle.

Despite its technical merits, the 411 faced an uphill battle in the marketplace. It was a decent, solid, reliable, and practical car. However, its most significant hurdle was its price tag. Other manufacturers offered similarly equipped models for significantly less money, often representing better overall value. Consequently, sales of the 411 were not robust. Volkswagen perhaps hoped that existing Bug owners, who had purchased their vehicles as first cars or for basic transportation, would view the 411 as a natural upgrade, but this transition didn't materialise on a large scale.

VW Type 412 (1972-1974)

The VW Type 412 model, manufactured from 1972 to 1974, directly replaced the 411. This iteration saw an increase in engine displacement to 1.8 litres (1795cc Flat-4). Visually, the 412 received a refreshed front end, featuring new headlight and nose designs penned by Brooks Stevens. Despite these updates, sales continued to remain poor, indicating that the fundamental challenges faced by the Type 4 car persisted.

Legacy and Longevity: Beyond the Type 4 Car

Without a doubt, the Type 4 engine proved to be the most successful component of the Type 4 model range. Its robust design and adaptability ensured its longevity far beyond the discontinuation of the 411 and 412 cars. It continued to power the Porsche 914 until 1976 and was even used in the one-year-only 912E for the US market. Crucially, it found a new lease of life powering the venerable VW Bus and Transporter models, remaining in production for these vehicles until 1982. At this point, it underwent a significant transformation, being highly modified for water cooling and famously becoming known as the “Wasserboxer” engine, a testament to its enduring design and adaptability.

Volkswagen Type 4 Engine Evolution Table

Volkswagen Type 4 Car Model Comparison

Frequently Asked Questions (FAQs)

What made the VW Type 4 engine different from the Type 1?

The VW Type 4 engine was a radical departure from the Type 1. It was designed to be much flatter to fit under the vehicle floor, freeing up boot space. Its 'over-square' design meant wider cylinders and a shorter stroke, resulting in a more robust engine with excellent low-down torque, lower heat production, and a different cooling shroud. It was also significantly more advanced, incorporating electronic fuel injection (Bosch D-Jetronic) later in its life, a feature not seen in the Type 1.

Was the Type 4 engine fuel injected?

Yes, the Type 4 engine did feature fuel injection. From 1972, Volkswagen introduced the Bosch D-Jetronic electronically controlled fuel injection system, significantly boosting power. However, some later variants, particularly the 1795cc engine for the 412LS, reverted to a twin carburettor arrangement. The European 1800cc Porsche 914 was also an exception, coming with Solex carburettors from the factory.

What cars used the Volkswagen Type 4 engine?

The Volkswagen Type 4 engine powered several significant vehicles. Its primary homes were the VW 411 and 412 cars. It was also famously used in the Porsche 914 and, for a brief period, the Porsche 912E (US Market). After its car applications ceased, the engine found extended life in the VW Type 2 (Bus/Transporter) and even the T25 models until 1983, before being adapted into the water-cooled 'Wasserboxer'.

Why were the Volkswagen Type 4 cars (411/412) not very popular?

Despite being technically advanced, reliable, and practical, the VW 411 and 412 models struggled with sales primarily due to their pricing. They were considerably more expensive than similarly equipped models from other manufacturers, which offered better perceived value. This high price point, combined with a design that some found less appealing than previous VW models, limited their market success.

Could a Type 4 engine be fitted to a Beetle?

While the Type 4 engine is a favourite among tuners for its robust nature and power delivery, fitting it into a Beetle's engine compartment is not a straightforward task. Due to its significantly greater width compared to the Type 1 engine, substantial fabrication work is required to accommodate it. However, for those willing to undertake the modification, a properly set up Type 4 engine can transform a Beetle's performance.

Conclusion

The Volkswagen Type 4 engine stands as a testament to VW's engineering ambition and capability. It broke away from the conventions of its predecessor, offering a sophisticated, powerful, and durable air-cooled solution designed for a new era of larger, more refined vehicles. While the Type 4 cars (the 411 and 412) themselves did not achieve widespread commercial success, the engine that powered them proved to be an enduring triumph, leaving an indelible mark on Volkswagen's history and continuing to be appreciated by enthusiasts for its innovative design and impressive capabilities. Its evolution from twin carburettors to sophisticated fuel injection, and its eventual transformation into the Wasserboxer, highlights its adaptability and the foresight of its original design.

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