Jeep 4.0 Engine Specs

Here in this article, you will learn about the Jeep 4.0 Engine Specs, Performance, Cam Specs & More, Let’s discuss the Jeep 4.0 Engine Specs, Valvetrain+, performance, and Reviews. The Jeep 4.0 is a legend in the Jeep community and the whole automotive industry. AMC developed this engine before Chrysler acquired the company in 1987.

The 4.0L straight-6 is a solid and strong engine, yet it is infamous for its lack of power. Regardless, the 4.0 is a fantastic all-around engine that remains popular. Good enough for Chrysler and Jeep to continue manufacturing it for more than two decades. This page concerns Jeep 4.0 engine problems, reliability, and other parameters.

Jeep 4.0 Engine Specs

The 4.0L inline-6 debuted in 1986, the same year Chrysler purchased AMC. Despite this, Chrysler elected to maintain the AMC-designed 4.0 for a long period. Nonetheless, Chrysler modified the straight-6 throughout time. We’ll return to this point in a bit to go through some additional details. The following chart provides some basic facts regarding the Jeep 4.0 engine:

Engine AMC/Jeep/Chrysler 4.0
Configuration Straight-6 (Inline-6)
Displacement 3,965 cc (4.0L)
Aspiration Natural
Block Material Cast iron
Head Material Cast iron
Valvetrain OHV
Bore x Stroke 98.4mm x 86.7mm
Compression 8.8 : 1 to 9.2 : 1
Power 173-190 HP
Torque 220-235 lb/ft

The 4.0-litre inline-six engine is just the same as it seems it would be. The actual displacement is around 3,965 cc, however for the sake of convenience, we will round it up to 4.0 L. It was typical practice in the 1980s to construct engine blocks and heads out of cast iron due to the material’s inherent durability and strength.

They are rarely seen anymore due to their size. In contrast to today’s engines, which feature single or double overhead camshafts, Jeep 4.0 engines had overhead valves. The first version, which debuted in 1987, had a starting output of 173 horsepower. Beginning with 177 horsepower in 1988, manufacturing quickly increased to 190 horsepower by 1991.

Over time, torque has also gotten better. Inevitably, numerous modifications were made to the 4.0 straight-6 engine during its almost 20 years in production. Some were created to boost efficiency, strength, and dependability, while others aided boost energy and torque.

Jeep 4.0 Engine Review

The Jeep 4.0L inline-six engine enjoys a stellar reputation as one of Chrysler’s finest engine creations. It earned acclaim for its robustness, dependability, and substantial torque performance.

This remarkable engine was in production from 1986 to 2006 and made its home in a diverse lineup of Jeep models, including the Cherokee, Wrangler, Grand Cherokee, and Comanche.

Full review YouTube video check here.

Jeep 4.0 Engine Specs FAQ

What year 4.0 Jeep motor was best?

Due to their dependability and longevity, 258ci cranks from the 1972–1980 model years are the best to use in 4.0L stroker engines.

How much horsepower can a Jeep 4.0 handle?

The Jeep was well-known for its dependability despite its relatively modest speed thanks to its 4.0-litre straight-six engine’s maximum 190 horsepower and 235 pound-feet of torque.

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