G2501-8 JAGUAR Engine

Review JAGUAR Engine

The Jaguar G2501-8 XK120-140 engine is a masterpiece of automotive engineering, hailing from Jaguar's legendary XK series. This engine, specifically designed for the XK120 and XK140 models produced between 1948 and 1954, is a six-cylinder, inline unit that delivers an exhilarating driving experience.

The XK120-140 engine boasts a displacement of 3442cc or 3443cc, depending on the specific model year. It features a dual-cam, overhead valve design with three SU carburetors, providing an impressive power output of 190 bhp at 5500 rpm. This engine's high-revving nature and lively power band make it a favorite among Jaguar enthusiasts and collectors.

The XK120-140 engine is renowned for its smooth and refined power delivery. The engine block is made from an aluminum alloy, which not only contributes to its lightweight construction but also aids in effective heat dissipation. The cylinder head is made of cast iron, ensuring strength and durability.

The engine's intake and exhaust systems are carefully designed for optimal performance. The triple SU H6 carburetors offer excellent fuel mixture control, while the exhaust system is tuned to provide a powerful and distinctive exhaust note.

The Jaguar G2501-8 XK120-140 engine is not just about power and performance; it also boasts a rich and storied history. It was first introduced in 1948 at the London Motor Show and quickly gained fame as the fastest production car in the world, with a top speed of 120 mph. This engine's iconic status in Jaguar's history is a testament to its engineering prowess and the enduring appeal of the XK series.

The XK120-140 engine is more than just a powerplant; it's a work of art that embodies the spirit of Jaguar. Its elegant design, power, and performance continue to inspire and captivate car enthusiasts around the world. Whether you're a Jaguar collector, restorer, or simply an admirer of fine automotive engineering, the Jaguar G2501-8 XK120-140 engine is an essential addition to your garage or collection.

The Jaguar XK120-140 engine, specifically the 3.4-liter straight-six unit, is a classic and iconic powerplant known for its smooth power delivery and distinctive exhaust note. If you're considering buying this engine for your project car or as a standalone purchase, here are some pros and cons to help you make an informed decision.

1. Smooth Power Delivery: The XK120-140 engine is famous for its linear power delivery, making it an ideal choice for those who prefer a responsive and predictable power output.

2. Distinctive Sound: The engine's exhaust note is a classic and desirable sound that many enthusiasts seek to replicate in their projects.

3. Relative Rarity: The XK120-140 engine is not as common as some other engines, which can make your project car stand out from the crowd.

4. Potential for High Performance: With some modifications, the XK120-140 engine can produce impressive power outputs, making it an attractive choice for performance enthusiasts.

5. Rich History: The Jaguar XK120-140 engine has a rich history and is considered a classic among car enthusiasts, adding to its appeal and desirability.

1. Cost: The XK120-140 engine can be expensive to purchase, especially if you're looking for a good condition, low-mileage unit.

2. Maintenance: The engine requires regular maintenance, including frequent oil changes and the use of high-quality parts.

3. Complexity: The XK120-140 engine is a complex piece of machinery, which can make repairs and maintenance more challenging for those without extensive mechanical experience.

4. Availability of Spare Parts: Some spare parts for the XK120-140 engine can be difficult to find, which can make repairs and restorations more time-consuming and expensive.

5. Compatibility: The engine may not be compatible with all vehicles or project cars, which could limit your options when it comes to finding a suitable application.

The Jaguar XK120-140 engine is a desirable and iconic powerplant that offers smooth power delivery, a distinctive sound, and a rich history. However, it also comes with some drawbacks, such as high cost, complexity, and potential availability issues. If you're an enthusiast with a deep pocket and a passion for Jaguar classics, then the XK120-140 engine could be an excellent addition to your project. However, if you're on a budget or looking for a more practical engine option, you may want to consider other alternatives. Ultimately, the decision to purchase an XK120-140 engine depends on your individual circumstances, preferences, and goals.

Details:

Early features that come with this engine include the original xk120 water pump, oil filter head and canister, distributor side entry Lucas cover, flywheel, exhaust manifolds, early aluminum pan sending unit in sump for level gauge reading on instrument panel petrol/oil cars. Readable early xk120 engine w5978-8 with replacement xk140 cylinder head2501-8.

specifications engineblocksam:

• brand: Jaguar
• mpn: G2501-8
• type: Engine Block
• oe/oem part number: W5978-8
• items included: Water Pump. Distributor, Flywheel, Water Pump. Distributor, Flywheel, Oil Filter
• material: Cast Iron
• vintage part: Yes
• country of origin: United Kingdom

general engineblocksam:

• category: Auto Parts > Car Truck Accessories > Engines > Blocks

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• started: march 8, 2026

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