How Much Horsepower Does a 258 Jeep Motor Have?

The Jeep 258 motor, renowned for it’s durability and versatility, stands as a formidable player in the realm of engines. Initially introduced as a powertrain alternative in 1976, it quickly gained popularity due to it’s impressive performance figures. With a robust horsepower output of 150 and a torque rating of 240 ft. lbs., the 258 became a coveted option for fans of the Jeep brand. It’s exceptional power-to-weight ratio and remarkable reliability set it apart from it’s predecessors, and as a result, the 232 engine was discontinued in favor of the 258.

How Much Horsepower Can You Get Out of a 4.0 Jeep?

However, with a few modifications, it’s possible to significantly increase the horsepower output of a 4.0 Jeep engine. One of the most common upgrades is installing a cold air intake system, which can provide a noticeable increase in both horsepower and torque. This allows the engine to breathe in cooler, denser air, resulting in more power.

Another popular modification is upgrading the exhaust system. By replacing the restrictive stock exhaust with a high-flow system, the engine is able to expel exhaust gasses more efficiently, increasing horsepower and torque. Additionally, installing headers can further improve exhaust flow and boost performance.

To maximize the potential of the 4.0 Jeep engine, many enthusiasts opt for a performance tune or chip. This allows for fine-tuning of the engines parameters, optimizing fuel and ignition timing for maximum power output. A performance tune can also remove any factory-imposed limitations, unleashing the engines full potential.

Installing a high-performance distributor, ignition coil, and spark plugs can improve spark energy and combustion efficiency, resulting in more power. Additionally, upgrading the fuel injectors and fuel pump can provide a better fuel flow, further enhancing performance.

Lastly, for those seeking even more power, engine modifications such as a camshaft upgrade or a stroker kit can provide significant horsepower gains. A performance camshaft can improve valve timing and duration, allowing for more efficient airflow and combustion. A stroker kit increases the engines displacement, resulting in a larger combustion chamber and more power.

Whether it’s through simple bolt-on upgrades or more extensive engine modifications, enthusiasts can push the limits of this iconic engine and enjoy the thrill of increased horsepower and performance.

Top 5 Cold Air Intake Systems for a 4.0 Jeep

  • Cold Air Intake – 4.0 Jeep
  • AEM Brute Force Intake System
  • K&N Performance Intake Kit
  • Volant PowerCore Intake System
  • Banks Power Ram-Air Intake System

The 4.0 Jeep motor, also known as the 4.0L engine, is a 6-cylinder engine with a displacement of 4.0 liters, which is equivalent to approximately 241.6 cubic inches. With it’s 3.8-inch bore and 3.41-inch stroke, this engine features 12 overhead valves and operates at a compression ratio of 8.8-to-It delivers a horsepower of 190 at 4600 RPMs and generates a torque of 235 lb-ft.

How Many Cubic Inches Is a 4.0 Jeep Motor?

Of torque at 3200 RPMs. The 4.0L engine, also known as the 242 engine, has been widely used in various Jeep models such as the Cherokee, Wrangler, and Grand Cherokee.

To calculate the cubic inch displacement of the 4.0L engine, we need to multiply the bore and stroke measurements by a mathematical formula.

In the case of the Jeep 4.0L engine, we multiply the bore of 3.8 inches by itself, then multiply the result by the stroke of 3.41 inches. Next, we multiply this value by the number of cylinders (6) and divide it by 4 to obtain the cubic inch displacement. Therefore, the cubic inch displacement of the 4.0L Jeep motor is approximately 241.6 cubic inches.

The 4.0L engine has gained a reputation for it’s durability and reliability. It’s become legendary among Jeep enthusiasts due to it’s longevity and capability. This engine has proven itself capable of handling tough off-road conditions and has become a popular choice for individuals seeking a dependable and powerful engine for their Jeep vehicles.

With an 8.8-to-1 compression ratio, the 4.0L engine delivers a good balance of power and efficiency. The compression ratio refers to the ratio of the volume in the combustion chamber when the piston is at the bottom of the stroke (bottom dead center) to the volume when the piston is at the top of the stroke (top dead center). A higher compression ratio typically results in increased power output, but it also requires higher-octane fuel.

The 4.0L engines horsepower and torque ratings make it suitable for a wide range of driving conditions. The 190 horsepower it produces at 4600 RPMs allows for ample acceleration and responsiveness, while the 235 lb-ft.

This 6-cylinder engine, with it’s 3.8-inch bore and 3.41-inch stroke, delivers 190 horsepower at 4600 RPMs and 235 lb-ft.

Comparison of the 4.0L Jeep Motor to Other Jeep Engines

The 4.0L Jeep motor is often compared to other Jeep engines because of it’s notable features and performance.
The 4.0L Jeep motor is renowned for it’s durability and reliability. Many Jeep enthusiasts consider it one of the best engines produced by Jeep. It’s inline-six configuration provides smooth power delivery and excellent low-end torque, making it ideal for off-road adventures. Additionally, it’s known for it’s straightforward design, ease of maintenance, and longevity.

In comparison to other Jeep engines, the 4.0L motor stands out due to it’s exceptional torque output. It surpasses smaller engines like the 2.5L and 2.4L engines in terms of low-end torque, enabling better performance in off-road situations and towing capabilities. However, it may lag behind larger V8 engines in terms of raw horsepower and high-end performance.

When compared to the newer Pentastar V6 engines, the 4.0L motor is often preferred by Jeep purists for it’s simplicity, proven reliability, and aftermarket support. While the Pentastar engines offer improved fuel efficiency and more advanced technology, the 4.0L motor is renowned for it’s ruggedness and ability to handle tough conditions.

The longevity of a Jeep Cherokee engine largely depends on proper maintenance and usage. On average, the 2.4-liter engine in the 2015 model can last between 175,000 to 200,000 miles, providing reliable performance throughout it’s lifespan. However, for those seeking increased power and performance, an optional upgrade to the more robust 3.2-liter engine with 271 horsepower was available. Let’s explore further the factors that affect the durability of a Jeep Cherokee engine.

How Many Miles Will a Jeep 2.4 Engine Last?

The longevity of a Jeep 2.4 engine can vary depending on various factors, including maintenance, driving habits, and operating conditions. Generally, a Jeep Cherokee engine equipped with a 2.4-liter engine has the potential to last between 175,000 to 200,000 miles before significant mechanical issues may arise.

This larger engine produces an impressive 271 horsepower, delivering enhanced performance capabilities. The longevity of the 3.2-liter engine should be similar to the 2.4-liter option, provided it’s properly maintained.

To maximize the lifespan of any Jeep engine, it’s crucial to adhere to a routine maintenance schedule. This includes regular inspections, oil changes, fluid top-ups, and frequent filter replacements. Additionally, driving habits, such as avoiding excessive revving and aggressive acceleration, can also have a positive impact on the engines longevity.

Furthermore, operating under specific conditions, such as extreme temperatures or off-road driving, may cause additional stress on the engine components. Proper care and attention to these factors will aid in ensuring the engines long life.

By following a regular maintenance routine and driving responsibly, owners can enjoy their Jeep for many years to come.

The Role of Oil Changes in Maintaining a Healthy Jeep 2.4 Engine

  • Regular oil changes are crucial for maintaining a healthy Jeep 2.4 engine.
  • The oil in the engine lubricates various moving parts, reducing friction and heat.
  • Regular changes help remove dirt, sludge, and contaminants that can accumulate in the oil over time.
  • Clean oil ensures optimal performance, improves fuel efficiency, and extends the engine’s lifespan.
  • It’s recommended to follow the manufacturer’s guidelines for oil change intervals.
  • Changing the oil filter along with the oil is also important for consistent engine health.
  • Using the right type and grade of oil, as specified by the manufacturer, is crucial for optimal engine performance.
  • Frequent driving in extreme conditions may require more frequent oil changes.
  • Regular oil changes also provide an opportunity to inspect the engine and identify any potential issues early on.
  • Overall, maintaining a consistent oil change schedule is key to keeping your Jeep 2.4 engine in top shape.

Source: 2015 Jeep Cherokee Life Expectancy |

Now, let’s take a closer look at why the Jeep 258 engine is widely regarded as a good choice. It’s reliability has been proven over the years, making it a trustworthy option for many Jeep enthusiasts. Additionally, it’s affordability makes it accessible to a wide range of owners. With it’s horse power and torque peaks at low RPM, the 258 engine provides a smooth and capable performance. Built with a cast iron block and cylinder head, hydraulic lifters, 7 main bearings, and a cast iron crankshaft and rods, it offers durability and strength. Furthermore, the 258 engine was always carbureted from the factory, ensuring simplicity and ease of maintenance.

Is the Jeep 258 a Good Engine?

The Jeep 258 is widely regarded as a good engine for several reasons. First and foremost, it’s highly reliable. This engine has proven it’s longevity and durability over the years, making it a popular choice among Jeep enthusiasts. It’s cast iron block and cylinder head provide robustness and resilience, capable of withstanding both on-road and off-road adventures.

It’s important to note that the 258 engine utilizes hydraulic lifters with non-adjustable rockers, providing ease of maintenance and reducing the need for frequent adjustments. This simplicity in design and maintenance adds to the engines appeal, as it makes it more user-friendly and accessible for Jeep owners who prefer to handle their own repairs and maintenance.

Lastly, the 258 engine has always been carbureted from the factory, which may be a positive or a negative depending on personal preference. While carburetors aren’t as fuel-efficient or technologically advanced as modern fuel injection systems, some Jeep enthusiasts appreciate their simplicity. Carburetors are generally easier to work on and troubleshoot, providing a more hands-on approach for those who enjoy tinkering with their engine. Additionally, the carbureted setup can be more forgiving in extreme off-road situations where fuel injection systems may encounter issues due to water or debris exposure.

It’s proven track record, low-end torque, simplicity, and carbureted setup make it a popular choice for Jeep owners looking for a dependable engine that can handle various driving conditions and modifications.

Comparisons With Other Popular Jeep Engines (Such as the 4.0L)

When looking at popular Jeep engines like the 4.0L, it’s important to note the differences and similarities with other engines. By comparing these engines, you can get a better understanding of their performance, reliability, and overall capabilities. This information proves valuable when deciding which engine best suits your needs and preferences.

During it’s production, the Jeep 4.2 engine gained a reputation for it’s durability and reliability, making it a popular choice among Jeep enthusiasts. The engine was used in various Jeep models, including the CJ-5, CJ-7, and Wrangler, and was known for it’s torquey performance and off-road capabilities. Despite the discontinuation of the 4.2 engine, many Jeep owners still cherish and maintain these iconic powerplants in their vehicles.

What Is a Jeep 4.2 Engine?

During it’s production run, the Jeep 4.2 engine gained a reputation for it’s reliability and versatility. It was widely used in various Jeep models, including the CJ series, Wrangler, and Cherokee. The engine featured a cast-iron block and cylinder head, providing durability and strength. It had a displacement of 4.2 liters, which is equivalent to 258 cubic inches.

The Jeep 4.2 engine utilized a carbureted fuel system, which was common during it’s era. It was equipped with a two-barrel or four-barrel carburetor, depending on the specific model and year. The carbureted setup allowed for easy maintenance and tuning, but also had it’s limitations in terms of fuel efficiency and emissions control.

Over the course of it’s production, the Jeep 4.2 engine underwent few changes. However, there were updates made to improve overall performance and address certain issues. For example, in 1981, the engine received a redesigned intake manifold to enhance fuel distribution and improve throttle response.

Despite it’s longevity, the Jeep 4.2 engine did face some criticism. One commonly reported issue was oil leaks, particularly from the rear main seal. However, with proper maintenance and periodic seal replacements, this issue could be addressed. It’s legacy can still be seen today, as many enthusiasts continue to maintain and rebuild these engines for their off-road adventures.

Common Modifications and Upgrades for the Jeep 4.2 Engine, Such as Adding Fuel Injection or Upgrading to a More Modern Fuel System.

The Jeep 4.2 engine is often modified or upgraded to improve it’s performance. Some popular modifications include adding fuel injection or upgrading to a more modern fuel system. These enhancements help improve fuel efficiency, increase power output, and ensure better engine response. These modifications are aimed at enhancing the engine’s overall performance without compromising it’s reliability.


With power numbers reaching up to 150 hp and 240 ft. lbs. of torque, it proved to be a reliable and capable option for Jeep enthusiasts. It’s popularity was further solidified when it became the base option in 1976, resulting in the discontinuation of it’s predecessor, the 232.

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