The Porsche 987: Unpacking the 9A1 Engine Revolution

The second-generation Porsche Boxster, known internally as the 987, arrived on the scene for the 2005 model year, following in the successful tyre tracks of the original 986. While it presented a significantly revamped aesthetic, both inside and out – with Porsche claiming an impressive 80% of its components were new – the initial powertrains largely carried over from its predecessor. However, the journey of the 987 was one of continuous refinement, culminating in a significant engineering leap that addressed lingering concerns and redefined its performance capabilities. This article delves into that evolution, focusing on the crucial introduction of the groundbreaking 9A1 engine and what it means for enthusiasts and prospective owners today.

When the 987.1, as the first iteration is known, launched, it brought with it the M97 flat-six engines. These were evolutions of the prior M96 units, featuring modest bumps in power. The base Boxster was equipped with a 2.7-litre engine producing 240 horsepower, whilst the 'S' variant boasted a 3.2-litre unit with 280 horsepower. Key differences from the older engines included a mechanical vacuum pump and an electronic oil management system, which, to the chagrin of some traditionalists, meant the beloved oil dipstick was no longer present. Crucially, the M97 engines were fitted with a larger and ostensibly stronger single-row intermediate shaft bearing. Despite this improvement, the IMS bearing remained a point of contention and concern for some, given its history in the earlier M96 engines, even if the failure rate was significantly reduced.

The 987 lineage expanded significantly in 2006 with the much-anticipated introduction of the 'Boxster coupe' – the Cayman S. Positioned strategically above the Boxster S in Porsche’s hierarchy, the Cayman S featured a slightly larger 3.4-litre engine, delivering 295 horsepower. This pricing strategy was somewhat unusual for the automotive industry, as convertibles are typically more expensive to manufacture, yet Porsche chose to price the coupe higher. This approach would persist until the 2017 model year when the mid-engined platform pricing was finally inverted. For the 2007 model year, the base Cayman joined the lineup, and both the Boxster S and Cayman S shared the 3.4-litre flat-six. The 2.7-litre engines in the base Boxster and Cayman received VarioCam Plus, boosting their output to 245 horsepower. The 2008 model year saw the 987 continue with minimal changes, setting the stage for a monumental shift.

Up until this point, all 987 engines were of the M97 type, retaining the intermediate shaft (IMS) design, a feature that, despite improvements, carried a certain perception of vulnerability. Porsche, in its relentless pursuit of engineering excellence, decided to completely overhaul the engine architecture. The solution was a revolutionary, entirely new design that jettisoned the intermediate shaft altogether: the 9A1 type engine.

The Dawn of the 9A7.2 and the 9A1 Engine

The pivotal moment arrived with the 2009 model year, marking the debut of the first 9A1 engines in the 987. This updated generation is often referred to by enthusiasts as the 987 Gen II or 987.2. The changes were far-reaching and transformative. The 3.4-litre 'S' engines now featured Direct Fuel Injection (DFI), a technology that precisely sprays fuel directly into the combustion chamber, leading to improved fuel efficiency, greater power output, and reduced emissions. This innovation saw horsepower figures climb modestly but effectively, reaching 310 hp in the Boxster S and a healthy 320 hp in the Cayman S, subtly re-establishing the performance hierarchy between the coupe and convertible.

For the base models, the flat-six engine saw its displacement increased to 2.9 litres, delivering 255 hp in the Boxster and 265 hp in the Cayman. Interestingly, these base engines did not receive the Direct Fuel Injection technology, retaining port injection. However, the most significant mechanical advancement was the complete redesign of the engine block, eliminating the much-discussed intermediate shaft and, by extension, the IMS bearing concern that had, however unfairly, shadowed its predecessors. This fundamental change offered greater peace of mind and enhanced the engine's long-term reliability.

Arguably an even more impactful performance upgrade for 2009 came in the form of the new automatic transmission option: the Porsche Doppelkupplungsgetriebe, or PDK. This seven-speed, double-clutch unit was a monumental leap forward from the older torque converter-based Tiptronic. The PDK transmission dramatically reduced shift times, offering lightning-fast gear changes that were both smooth and incredibly efficient. For the first time, automatic cars could rival, and in many cases, outright beat, their manual counterparts in acceleration and lap times due to the PDK's superior shifting speed and precision. This innovation not only elevated the 987's performance but also broadened its appeal to a wider range of drivers.

The 987.2 generation, with its enhanced engines and revolutionary PDK transmission, continued production through 2012, undergoing only minor refinements before Porsche introduced the next-generation 981 Boxster in 2013.

Porsche 987 Engine Evolution at a Glance

Special Edition 987 Models

As is customary with Porsche, several special edition models were released, particularly towards the end of the 987's production run, offering unique styling, performance tweaks, and enhanced collectibility. These limited-run vehicles often command a premium and are highly sought after by collectors and enthusiasts.

Living with a Porsche 987: Ownership and Considerations

The 987 was, and remains, a truly excellent sports car. Its design was intentionally more aggressive than the 986, and it was met with widespread acclaim from critics and customers alike. Many 986 owners upgraded, seeking a more modern and powerful iteration of their beloved mid-engined sports car. Driving a 987 is an inherently enjoyable experience, characterised by precise steering, balanced handling, and an intoxicating exhaust note, particularly if equipped with the optional Sport Exhaust System (PSE).

However, no car is entirely without its quirks, and the 987 is no exception. While the IMS bearing in the 987.1 generation was significantly more robust than in the earlier 986 Boxsters, the perception of potential failure persisted, albeit at a much lower rate. For those considering a 987.1, it's a factor to be aware of, though many strategies exist to mitigate perceived risks. The 9A1 engines in the 987.2 completely circumvent this concern due to their redesigned architecture.

One of the most common complaints regarding the 987's interior, if not specified with the full leather option, is the rubbery-type paint finish used on many surfaces. This finish has a tendency to peel over time, revealing unsightly black plastic underneath. Many owners have opted for professional re-painting or have chosen to re-upholster these areas in leather to restore the interior's aesthetic appeal.

Another known issue for the 987 generation involves the shift cables. These cables, which connect the gear lever to the transmission, were prone to breaking on some early models. Thankfully, updated and stronger replacement cables are readily available from both Porsche and various aftermarket suppliers, making this a relatively straightforward and inexpensive fix for peace of mind.

The Importance of a Pre-Purchase Inspection (PPI)

With the oldest 987s now approaching their teenage years, they are at or near the bottom of their depreciation curve, making them an increasingly attractive proposition in the used car market. Many believe that prices have stabilised and may even begin a slow, steady ascent. Given that Porsche has introduced two subsequent mid-engined platforms (the 981 in 2013 and the 718/982 in 2017), there's a healthy supply of well-maintained 987s available.

Before committing to a purchase, a comprehensive Pre-Purchase Inspection (PPI) is not just recommended, it's absolutely essential. The 987 is a modern vehicle, replete with complex electronic systems and multiple onboard computers that oversee everything from the engine management and alarm system to the convertible top, windows, air conditioning, and anti-lock braking system. To truly ascertain the health of these intricate systems and to identify any latent error codes or malfunctions, the car must be connected to a Porsche-specific diagnostic tool, such as the PIWIS device.

A thorough PPI using a PIWIS tester allows the inspector to delve into critical engine data, including whether the engine has ever been over-revved and, if so, to what extent. This provides invaluable insight into how the car has been driven and maintained throughout its life. Beyond engine diagnostics, the PIWIS can check the operational status of all individual systems, providing a holistic view of the vehicle's health. Furthermore, a skilled inspector can often discern signs of track use, previous accident damage, and critically, whether any repairs were carried out to a high standard, thus preserving the car's structural integrity and value.

Given the increasing frequency of natural disasters, particularly flooding events, it's also paramount that a PPI includes a meticulous check for signs of water ingress or flood damage. Unfortunately, many 'drowned' vehicles, including 987s, can find their way onto the used market. The damage from water can often be insidious, not becoming apparent until much later, at which point the remedial costs can be astronomical. An experienced inspector will dedicate time to look for subtle tell-tale signs of water intrusion, which can save a prospective buyer from significant future expense and heartache. The cost of a PPI is, without doubt, a very sound investment in safeguarding your purchase.

Frequently Asked Questions (FAQs)

What is the main difference between a 987.1 and a 987.2?

The primary difference lies in the engine and transmission. The 987.1 (2005-2008) uses the M97 engine with an intermediate shaft (IMS bearing), while the 987.2 (2009-2012) features the redesigned 9A1 engine, which eliminates the IMS bearing. Additionally, the 987.2 introduced Direct Fuel Injection (DFI) for 'S' models and the highly praised PDK double-clutch automatic transmission.

Is the IMS bearing still a concern for the Porsche 987?

For the 987.1 generation (M97 engine), the IMS bearing is still a consideration, though its failure rate is significantly lower than that of the earlier 986 generation. For the 987.2 generation (9A1 engine), the IMS bearing is completely eliminated, so it is not a concern.

Should I buy a PDK or manual 987?

This largely comes down to personal preference. The PDK offers lightning-fast shifts and superior performance figures, making it ideal for spirited driving or track use. The manual transmission provides a more engaging and traditional driving experience, preferred by purists. Both are excellent choices, so test drive both to see which suits your driving style.

What are the common maintenance costs for a 987?

Like any Porsche, the 987 requires regular maintenance by specialists. Routine servicing (oil changes, filters) is comparable to other premium sports cars. Larger services (spark plugs, drive belt) occur less frequently. Be aware of potential costs for interior re-finishing (due to peeling paint) and, for 987.1 models, potentially addressing the IMS bearing if desired. Tyres and brakes will be ongoing costs, depending on driving style.

Is the 987 a good daily driver?

Yes, the 987, particularly with the comfort and efficiency of the PDK, can be an excellent daily driver. It offers a comfortable ride, practical storage (front and rear boots), and a refined driving experience, making it suitable for both spirited weekend drives and everyday commuting.

The Porsche 987 generation stands as a testament to Porsche's continuous innovation and commitment to refining its mid-engined sports car platform. The introduction of the 9A1 engine and the PDK transmission in the 987.2 models marked a significant leap forward in performance, reliability, and driving enjoyment. Whether you opt for an earlier M97-powered model or the more advanced 9A1 variant, the 987 offers an intoxicating blend of driving dynamics, iconic design, and a tangible connection to the road. With careful consideration and a thorough Pre-Purchase Inspection, a 987 could be the perfect addition to any enthusiast's garage, promising years of driving pleasure as its value slowly and steadily appreciates.

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