F20C vs F22C: Which S2000 Engine is For You?

The Honda S2000, with its high-revving, naturally aspirated heart, remains a pinnacle of performance engineering for many enthusiasts. But for those looking to replace an engine or considering an upgrade, a common dilemma arises: should you opt for the original F20C or the later F22C? Both are phenomenal engines, but they offer distinct characteristics that can significantly alter the driving experience. Understanding these differences is key to making the right choice for your cherished S2000.

The F20C: The Original High-Revving Legend

Introduced with the AP1 generation S2000, the F20C engine quickly earned legendary status for its extraordinary specific output and a redline that seemed to defy physics. With a displacement of 2.0 litres (1,997 cc), this engine was designed to rev, rev, and then rev some more. Its square bore and stroke ratio (87mm x 84mm) contributed to its incredible ability to spin up to a stratospheric 9,000 RPM, delivering its peak power high in the rev range. This characteristic gives the AP1 a raw, almost motorcycle-like feel, demanding the driver to constantly work the gearbox to stay in the power band.

The F20C's power delivery is often described as peaky. While it provides exhilarating acceleration once VTEC engages, some drivers find the low-end torque lacking, especially in daily driving scenarios. However, this is precisely what many purists adore – the challenge and reward of extracting every bit of power by keeping the engine on the boil. For those who love track days and spirited B-road blasts, the F20C’s relentless surge to its dizzying redline is an unparalleled experience. It embodies the essence of Honda's 'power of dreams' philosophy, pushing the boundaries of what was thought possible from a naturally aspirated four-cylinder.

The F22C: The Evolution with More Torque

With the introduction of the AP2 S2000 in 2004 (for the UK market, this often refers to the later versions of the S2000, which did receive the F22C in some regions, though primarily it was the US/Japanese AP2 models), Honda made a significant change under the bonnet. The F22C engine, as its name suggests, increased displacement to 2.2 litres (2,157 cc) by lengthening the stroke (87mm x 90.7mm). While this change might seem minor, it had a profound impact on the engine's character. The longer stroke inherently shifted the torque curve lower in the RPM range, providing a more accessible power delivery.

The most noticeable difference with the F22C is its improved mid-range torque. This makes the AP2-equipped S2000 feel more tractable and less demanding in everyday driving situations. You don't have to downshift as frequently to accelerate, making for a more relaxed experience in traffic or when cruising. However, this increased flexibility came at the cost of the F20C's famed 9,000 RPM redline, with the F22C's limiter set at 8,000 RPM. While still incredibly high for a production engine, some enthusiasts felt it sacrificed a piece of the S2000's unique, high-revving soul.

Despite the lower redline, the F22C is by no means a slouch. A stock F22C in an AP2 S2K typically puts down around 210 horsepower to the rear wheels, a testament to its efficient design. Furthermore, the F22C's slightly more robust bottom end and better mid-range torque often make it a preferred choice for those considering forced induction or significant naturally aspirated builds, as it provides a better foundation for higher power outputs without constantly living at the extreme edge of the RPM range.

Pushing the F22C's Limits: A Case Study

For those questioning the F22C's potential, consider builds that take it from impressive to truly extraordinary. We’ve seen compelling examples of F22C engines transformed into fire-spitting machines. One notable build, starting with a stock F22C in an AP2, achieved a staggering 260 rear wheel horsepower – a 25% improvement over stock – without even opening up the bottom end of the engine. This is a ludicrous jump, proving the F22C's inherent strength and tunability. The engine’s maximum torque also saw a healthy increase, up to 161 lb-ft to the wheels.

Achieving such figures involved a meticulous approach to the cylinder head and supporting modifications. The cylinder head was sent to specialists like 4 Piston Racing, where ports were meticulously cleaned and enlarged. A full complement of Ferrea valvetrain components were installed, perfectly matched with custom DDTech camshafts, allowing the engine to briefly see 9,000 RPM before ignition cut. Fuel delivery was upgraded with Acura RDX injectors, all precisely controlled by a Haltech tuneable standalone ECU. Air was drawn in through a PasswordJDM carbon intake, while spent exhaust gases were expelled via a Skunk2 header and a Tanabe “Medallion Touring” header-back exhaust. In a classic case of “while-I’m-at-it syndrome,” the clutch and pressure plate were also upgraded, opting for a lighter OEM AP1-style flywheel to complement the engine’s new character. This particular car, dyno-tuned on pump petrol, is now being optimised for flexible fuel use, switching between pump petrol, E85, and race fuel, or even a combination of all three. This demonstrates the immense potential for the F22C to be built into a serious performance engine for both street and track use.

Key Differences and Driving Experience

Beyond the raw specifications, the F20C and F22C offer distinct driving experiences:

• Redline: The most obvious difference. The F20C’s 9,000 RPM redline provides an unparalleled sense of urgency and a truly unique auditory experience. The F22C’s 8,000 RPM redline, while still high, feels slightly less extreme but more usable.
• Torque Delivery: The F20C is a classic 'momentum car' engine; you need to carry speed and keep the revs high to extract its performance. The F22C, with its increased displacement and longer stroke, offers a broader, flatter torque curve, making it more forgiving and flexible in everyday driving.
• Gearbox Feel: While both engines are paired with Honda's sublime 6-speed manual gearbox, the F20C's peaky nature encourages more frequent downshifts to stay in the VTEC zone. The F22C allows for more relaxed gear changes, particularly at lower speeds.
• Flywheel Weight: Generally, the F20C comes with a lighter flywheel, contributing to its quicker revving nature. The F22C often has a slightly heavier flywheel, which can smooth out power delivery but slightly reduce the engine's eagerness to rev up and down.

Cost, Availability, and Installation Considerations

When considering a used F20C or F22C engine, several practical aspects come into play:

• Availability: Both engines are now several years old, and finding low-mileage, well-maintained examples can be challenging. The F22C, being the later engine, might be slightly easier to source in some markets, but demand for both remains high.
• Cost: Prices for used engines vary wildly depending on condition, mileage, and whether they come with ancillaries. A 'blown' engine might be cheaper initially but will require significant investment for a rebuild. A fully tested, low-mileage engine will command a premium.
• Installation: Swapping an F20C into an AP2 or an F22C into an AP1 is generally straightforward from a physical fitment perspective, as the engine mounts are largely the same. However, wiring harnesses, ECU compatibility, and sensors can differ. For an optimal swap, it's often best to use the donor engine's ECU and wiring harness or invest in a standalone ECU like the Haltech mentioned in the F22C build example, which allows for precise tuning regardless of the original engine's specific requirements.
• Condition: Always request compression and leak-down test results if purchasing a used engine. These tests are crucial for assessing the internal health of the engine and avoiding costly surprises down the line.

Comparative Table: F20C vs F22C (General Characteristics)

Frequently Asked Questions (FAQs)

Q: Can I put an F22C engine into my AP1 S2000?

A: Yes, it is a common swap. The F22C will physically fit into the AP1 chassis without major modification to engine mounts. However, you'll need to address the ECU and wiring differences. Many opt for a standalone ECU like a Haltech or AEM to properly control the F22C, especially if you're looking to maximise its potential or avoid compatibility issues with the F20C's original ECU.

Q: Can I put an F20C engine into my AP2 S2000?

A: Absolutely. This swap is also popular, especially for those AP2 owners who miss the higher redline and raw feel of the F20C. Similar to the F22C swap into an AP1, you'll need to manage the ECU and wiring. A standalone ECU is often the preferred route for optimal performance and tuning.

Q: Are F20C and F22C engines reliable?

A: Both engines are renowned for their exceptional reliability, provided they are properly maintained. Regular oil changes with high-quality synthetic oil, adherence to service intervals, and ensuring the valve retainers are checked (especially on early F20Cs) are crucial. The high-revving nature means they are precision instruments and require care.

Q: What are common issues to look out for when buying a used F20C or F22C?

A: Common issues can include worn valve retainers (more prevalent on early F20Cs, though many would have been replaced by now), oil consumption (a common trait of high-revving engines, but excessive consumption indicates wear), and timing chain tensioner (TCT) issues. Always ask for service history, and if possible, perform a compression and leak-down test before purchase to assess engine health.

Q: Is it worth rebuilding a 'blown' S2000 engine, or should I just buy a used one?

A: This depends on the extent of the damage and your budget. A full rebuild can be costly but results in a 'new' engine tailored to your specifications, often with stronger components. Buying a used engine can be quicker and potentially cheaper upfront, but carries the risk of unknown history and potential hidden issues. For serious performance builds, a rebuild with forged internals is often the preferred route, as it allows for greater power potential and longevity.

Conclusion: Your S2000, Your Choice

Ultimately, the decision between an F20C and an F22C for your Honda S2000 boils down to personal preference and your intended use for the car. If you crave the unadulterated, high-revving thrill of a pure sports car, constantly shifting gears to stay in the screaming VTEC zone, then the F20C is likely your champion. It offers that raw, visceral connection that defined the original S2000 experience.

However, if you desire a more flexible engine with stronger mid-range torque for daily driving, spirited road use without constant gear changes, or if you plan to explore significant power upgrades through forced induction, the F22C presents a highly compelling case. Its slight refinement in power delivery doesn't diminish its performance credentials; instead, it broadens the S2000's appeal and offers a more tractable package for a wider range of driving situations. Both engines are engineering marvels, epitomising Honda's dedication to high-performance, naturally aspirated powerplants. Whichever you choose, you're guaranteed an exhilarating experience behind the wheel of one of the finest roadsters ever built.

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