Motor Choices in the AMC Javelin: Exploring its Engines and Performance

The AMC Javelin, a iconic muscle car produced from 1968 to 1974, came equipped with a range of engine options, each offering a unique driving experience and performance. This article delves into the various motor choices available for the AMC Javelin, highlighting the differences and characteristics of each engine variant.

Base Engine: 232 cu. in. 6-Cylinder

Under the hood of the AMC Javelin was the base 232 cubic inch straight-six engine, which was a staple of the AMC lineup. This engine, with an output of approximately 145 bhp, was the standard offering in the base models. Despite its relatively modest power, it was reliable and offered adequate performance for everyday driving. It was particularly suitable for those looking for a more economical and fuel-efficient option.

Selecting a V-8 Engine

For those seeking a more powerful performance machine, the AMC Javelin offered two optional V-8 engines. The first of these was the 290 cu. in. V-8, which was likely the standard engine in the SST package. This engine provided 200 bhp and was well-suited for those who wanted a faster and more enthusiastic driving experience. The second option was the 343 cu. in. V-8, which boasted an impressive 280 bhp. This engine was a significant step up in performance, offering a noticeable increase in both power and torque.

The most powerful engine available for the AMC Javelin was the 390 cu. in. V-8, which delivered around 320 bhp. This engine was the pinnacle of performance for the Javelin, delivering an exhilarating driving experience for enthusiasts. In the later years of the Javelin's production, a 401 cu. in. V-8 was introduced, although it is uncertain if this engine was ever used in the Javelin.

Engine Measurement Adjustments

Notably, the horsepower figures for the AMC Javelin changed in 1970. Prior to this year, horsepower was measured in gross or brake power, which represented the maximum power produced by the engine. However, after 1970, the figures began to reflect the net horsepower, which was the power delivered to the driving wheels, taking into account any drivetrain losses. This shift in measurement standards provided a more accurate representation of the actual power delivered to the road.

Additional Engine Variants and Performance Upgrades

While the base and optional engines were the primary choices, some enthusiasts sought to further enhance the performance of their AMC Javelin. In some cases, larger engines were installed as upgrades. For instance, a friend of the author had a 427 cubic inch Chevy engine installed in his 1971 Javelin, while another friend improved the camshaft and upgraded the headers and carburetors to achieve better performance out of the 401 V-8 engine. These modifications demonstrate the potential for further performance tuning beyond the factory options.

The Javelin Family: Diverse Applications

In addition to the legendary AMC Javelin, it is important to note that there are other aircraft and missiles named Javelin, each powered by different engines. The Gloster Javelin, an all-weather interceptor aircraft, was powered by Armstrong Siddeley Sapphire engines. Meanwhile, the FGM-148 Javelin anti-tank missile utilizes a solid propellant rocket motor. While these vehicles are not directly related to the AMC Javelin, it is interesting to note the diverse applications of the moniker "Javelin."

Conclusion and Further Reading

The AMC Javelin was a versatile and powerful vehicle, with a range of engine options designed to suit varying performance needs. From the efficient 232 cubic inch straight-six to the powerful 390 cubic inch V-8, the AMC Javelin provided a robust performance platform. For those interested in learning more about the AMC Javelin, resources such as the MotorTrend website offer detailed information on the engine configurations and performance figures from 1971 to 1974.